Datasheet PM8620-BIAP Datasheet (PMC)

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PM8620

NSE-20G

NSE-20G™ Standard Product Data Sheet

Preliminary

20G Narrowband Switch Element

Data Sheet

Preliminary

Issue 3: May, 2001

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use Document ID: PMC-2000170, Issue 3

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NSE-20G™ Standard Product Data Sheet

Preliminary

Legal Information

The information is proprietary and confidential to PMC-Sierra, Inc., and for its customers’ internal use. In any event, you cannot reproduce any part of this document, in any form, without the express written consent of PMC-Sierra, Inc.

PMC-2000170 (P3)

Disclaimer

None of the information contained in this document constitutes an express or implied warranty by PMC-Sierra, Inc. as to the sufficiency, fitness or suitability for a particular purpose of any such information or the fitness, or suitability for a particular purpose, merchantability, performance, compatibility with other parts or systems, of any of the products of PMC-Sierra, Inc., or any portion thereof, referred to in this document. PMC-Sierra, Inc. expressly disclaims all representations and warranties of any kind regarding the contents or use of the information, including, but not limited to, express and implied warranties of accuracy, completeness, merchantability, fitness for a particular use, or non-infringement.

In no event will PMC-Sierra, Inc. be liable for any direct, indirect, special, incidental or consequential damages, including, but not limited to, lost profits, lost business or lost data resulting from any use of or reliance upon the information, whether or not PMC-Sierra, Inc. has been advised of the possibility of such damage.

Trademarks

S/UNI is a registered trademark of PMC-Sierra, Inc. and NSE-20G, SBS, CHESS, TEMUX-84, AAL1gator-32, FREEDM-336, SPECTRA, and SBI are trademarks of PMC-Sierra, Inc.

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Contacting PMC-Sierra

PMC-Sierra 8555 Baxter Place Burnaby, BC Canada V5A 4V7

Tel: (604) 415-6000 Fax: (604) 415-6200

Document Information: document@pmc-sierra.com Corporate Information: info@pmc-sierra.com Technical Support: apps@pmc-sierra.com Web Si te: http://www.pmc-sierra.com

NSE-20G™ Standard Product Data Sheet

Preliminary

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NSE-20G™ Standard Product Data Sheet

Preliminary

1 Features..................................................................................................................... 11

2 Applications ...............................................................................................................12

3 References ................................................................................................................13

4 Application Examples ................................................................................................ 14

5 Block Diagram ...........................................................................................................17

6 Description.................................................................................................................19

7 Pin Diagram ...............................................................................................................20

8 Pin Description........................................................................................................... 24

8.1 Pin Description Table ........................................................................................24

8.2 Analog Power Filtering Recommendations.......................................................41

9 Functional Description ...............................................................................................43

9.1 LVDS Overview .................................................................................................43

9.1.1 LVDS Receiver (RXLV) ........................................................................44

9.1.2 LVDS Transmitter (TXLV).....................................................................44

9.1.3 LVDS Transmit Reference (TXREF) ....................................................44

9.1.4 Data Recovery Unit (DRU)...................................................................44

9.1.5 Parallel to Serial Converter (PISO) ......................................................45

9.1.6 Clock Synthesis Unit (CSU) .................................................................45

9.2 Receive 8B/10B Frame Aligner (R8TD) ............................................................ 45

9.2.1 FIFO Buffer...........................................................................................45

9.3 Transmit 8B/10B Encoder (T8TE).....................................................................45

9.3.1 SBI336S 8B/10B Character Encoding .................................................46

9.3.2 Serial TelecomBus 8B/10B Character Encoding.................................. 47

9.3.3 Serial SBI336S and TelecomBus Alignment ........................................ 49

9.3.4 Character Alignment Block ...................................................................49

9.3.5 Frame Alignment ..................................................................................50

9.3.6 SBI336S Multiframe Alignment ............................................................52

9.4 DS0 Cross Bar switch (DCB) ............................................................................ 52

9.5 Clock Synthesis and Transmit Reference Digital Wrapper (CSTR)..................53

9.6 Fabric Latency................................................................................................... 53

9.7 JTAG Support....................................................................................................53

9.8 Microprocessor Interface ..................................................................................53

9.9 In-band Link Controller (ILC).............................................................................54

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NSE-20G™ Standard Product Data Sheet

Preliminary

9.9.1 In-Band Signaling Channel Fixed Overhead........................................55

9.10 Microprocessor Interface ..................................................................................56

10 Normal Mode Register Description............................................................................60

11 Test Features Description........................................................................................131

11.1 Master Test and Test Configuration Registers ................................................131

11.2 JTAG Test Port ................................................................................................134

11.2.1 Boundary Scan Cells.......................................................................... 138

12 Operation .................................................................................................................140

12.1 Software Default Settings ...............................................................................140

12.1.1 Setting the T8TE Time-slot Configuration #1 Register....................... 140

12.1.2 Setting the T8TE Time-slot Configuration #2 Register....................... 140

12.1.3 Configuring the NSE-20G to Use Fewer Links ..................................140

12.1.4 PCB Design Notes .............................................................................142

12.2 “C1” Synchronization.......................................................................................142

12.3 Synchronized Control Setting Changes .......................................................... 143

12.3.1 SBS/NSE-20G Systems with DS0 and CAS switching ......................143

12.3.2 SBS/NSE-20G Systems switching DS0s without CAS ......................145

12.3.3 SBS/NSE-20G Non-DS0 Level Switching with SBI336 Devices .......147

12.4 NSE-20G CPU Interaction with the Switching Cycle When Using the ILC .....148

12.5 Controlling frame alignment in the receive port. .............................................149

12.6 DS0 Cross-Bar Switch (DCB) Operation ........................................................150

12.6.1 Configuring the DCB using Port Transfer Mode.................................150

12.6.2 Configuring the DCB using Word Transfer Mode...............................151

12.6.3 Reading Configurations...................................................................... 152

12.6.4 DCB Online to Offline Memory Page Copy........................................152

12.7 TelecomBus Mode Operation.......................................................................... 153

12.8 SBI column Mode Operation...........................................................................153

12.9 SBI DS0 Mode Operation ...............................................................................154

12.10 SBI DS0 with CAS Mode Operation................................................................154

12.11 ILC Operation.................................................................................................. 155

12.12 ILC CPU Operations .......................................................................................156

12.12.1 Accessing the Transmit Message FIFO .............................................156

12.12.2 Accessing the Receive Message FIFO ..............................................156

12.12.3 Handling the Transmit Header ...........................................................160

12.12.4 Handling the Receive Header ............................................................ 160

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NSE-20G™ Standard Product Data Sheet

Preliminary

12.12.5 Handling Interrupts .............................................................................160

12.12.6 Bypass Function.................................................................................160

12.13 Switch Setting Algorithm .................................................................................162

12.13.1 Problem Description ...........................................................................162

12.13.2 Naïve Algorithm .................................................................................. 163

12.13.3 Bi-partite graphs ................................................................................. 165

12.13.4 Unicast ...............................................................................................166

12.13.5 Experimental Results .........................................................................168

12.13.6 Multicast .............................................................................................168

12.14 JTAG Support..................................................................................................169

12.14.1 TAP Controller ....................................................................................170

12.14.2 States..................................................................................................170

12.14.3 Instructions .........................................................................................171

13 Functional Timing.....................................................................................................173

13.1 Receive Interface Timing ................................................................................173

13.2 Transmit Interface Timing................................................................................174

14 Absolute Maximum Ratings ..................................................................................... 176

15 D.C. Characteristics.................................................................................................177

16 Microprocessor Interface Timing Characteristics ....................................................179

17 A.C. Timing Characteristics .....................................................................................182

17.1 Input Timing.....................................................................................................182

1.1 Reset Timing ...................................................................................................183

17.2 Serial SBI Bus Interface ..................................................................................184

17.3 JTAG Port Interface.........................................................................................184

18 Ordering and Thermal Information ..........................................................................186

18.1 Packaging Information ....................................................................................186

18.2 Thermal Information ........................................................................................186

19 Mechanical Information ........................................................................................... 188

Notes ...............................................................................................................................189

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NSE-20G™ Standard Product Data Sheet

Preliminary

List of Registers

Register 00EH: SBS User Bit 0 ......................................................................................... 76

Register 00FH: SBS User Bit 1 .........................................................................................77

Register 010H: SBS User Bit 2 .........................................................................................78

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NSE-20G™ Standard Product Data Sheet

Preliminary

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NSE-20G™ Standard Product Data Sheet

Preliminary

List of Figures

Figure 1 An OC-48 T1/E1 ADM (Individually Drop/Add any T1/E1 in STS-48) ..............14

Figure 2 An OC-48 T1/E1 ADM (Drop/Add up to STS-48 at STS-1 Granularity)............14

Figure 3 Any-Service-Any-Port TDM Access Solution ....................................................15

Figure 4 Any-Service-Any-Port DS0-Granularity PHY Card ...........................................16

Figure 5 NSE-20G Block Diagram Showing TSBs..........................................................17

Figure 6 NSE-20G UBGA-480 Ball Diagram (Bottom-View)........................................... 20

Figure 7 Analog Power Filter Circuit................................................................................42

Figure 8 Generic LVDS Link Block Diagram ...................................................................43

Figure 9 Character Alignment State Machine .................................................................50

Figure 10 Frame Alignment State Machine.....................................................................51

Figure 11 In-Band Signaling Channel Message Format ................................................. 55

Figure 12 In-Band Signaling Channel Header Format ....................................................55

Figure 13 Input Observation Cell (IN_CELL) ................................................................138

Figure 14 Output Cell (OUT_CELL) ..............................................................................139

Figure 15 Bidirectional Cell (IO_CELL) .........................................................................139

Figure 16 Layout of Output Enable and Bidirectional Cells...........................................139

Figure 17 Shutting down a link ...................................................................................... 141

Figure 18 “C1” Synchronization Control........................................................................143

Figure 19 TEMUX-84™/SBS/NSE/SBS/AAL1GATOR-32™ system DS0

Switching with CAS .......................................................................................144

Figure 20 CAS Multiframe timing ..................................................................................145

Figure 21 Switch Timing DSOs with CAS .....................................................................145

Figure 22 TEMUX-84/SBS/NSE/SBS/FREEDM-336 system DS0 Switching no

CAS...............................................................................................................146

Figure 23 Switch Timing - DSOs without CAS ..............................................................147

Figure 24 Non DS0 Switch Timing ................................................................................148

Figure 25 Architecture of the RAM Input Interface........................................................150

Figure 26 C1 Position in the First Row..........................................................................155

Figure 27 Transport Overhead Affected by ILC ............................................................161

Figure 28 Example Graph .............................................................................................164

Figure 29 Time Space Time Switching in one NSE-20G and four Single-Ported

SBSs .............................................................................................................164

Figure 30 Example Graph .............................................................................................166

Figure 31 Example Problem..........................................................................................167

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NSE-20G™ Standard Product Data Sheet

Preliminary

Figure 32 Merged Graph ...............................................................................................167

Figure 33 Relabeled Graph ...........................................................................................168

Figure 34 Boundary Scan Architecture .........................................................................169

Figure 35 TAP Controller Finite State Machine.............................................................170

Figure 36 Receive Interface Timing ..............................................................................173

Figure 37 Transmit Interface Timing .............................................................................174

Figure 38 CMP Timing ..................................................................................................175

Figure 39 Microprocessor Interface Read Timing .........................................................179

Figure 40 Microprocessor Interface Write Timing .........................................................181

Figure 41 NSE-20G Input Timing ..................................................................................182

Figure 42 RSTB Timing.................................................................................................183

Figure 43 JTAG Port Interface Timing...........................................................................185

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NSE-20G™ Standard Product Data Sheet

Preliminary

List of Tables

Table 1 Analog Power Filters ..........................................................................................42

Table 2 SBI336S Character Encoding ............................................................................46

Table 3 Serial TelecomBus Character Encoding ............................................................48

Table 4 Switching Control RAM layout............................................................................53

Table 5 In-band Message Header Fields ........................................................................55

Table 6 NSE-20G Register Map......................................................................................56

Table 7 TX FIFO Message Level ..................................................................................120

Table 8 RX FIFO Message Level ..................................................................................125

Table 9 RXFIFO Threshold Values ...............................................................................128

Table 10 RXFIFO Timeout Delay .................................................................................. 128

Table 11 Test Mode Register Memory Map .................................................................. 131

Table 12 Instruction Register (Length - 3 bits) ..............................................................134

Table 13 Identification Register.....................................................................................134

Table 14 Boundary Scan Register ................................................................................135

Table 15 Absolute Maximum Ratings............................................................................176

Table 16 D.C Characteristics ........................................................................................177

Table 17 Microprocessor Interface Read Access .........................................................179

Table 18 Microprocessor Interface Write Access..........................................................181

Table 19 NSE-20G Input Timing ( Figure 41 ) ..............................................................182

Table 20 RSTB Timing ( Figure 42 ) .............................................................................183

Table 21 Serial SBI Bus Interface ................................................................................. 184

Table 22 JTAG Port Interface ( Figure 43 ) ................................................................... 184

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1 Features

The Narrowband Switch Element 20G (NSE-20G):

• Implements a Scaleable Bandwidth Interconnect (SBI™) DS0 granularity Space switch.

• Implements a SONET/SDH VT1.5/VT2/TU11/TU12 granularity Space switch for the serial

777.6 MHz LVDS TelecomBus.

• With the allied SBS or SBS-lite device, implements a DS0 granularity Memory-Space-

Memory switch.

• Supports 32 STS-12 equivalent serial ports via 777.6 MHz, 8B/10B encoded LVDS links

(each port can be either Serial TelecomBus or Serial SBI336S)

• When configured for SBI mode, switches DS0 or N*DS0 for all T1 and E1 tributaries and

aggregate columns for switching T1, E1, TVT1.5, TVT2, DS3 and E3 tributaries.

• When configured for the serial 777.6 MHz TelecomBus interface, switches any SONET/SDH

virtual tributary or tributary unit up to STS-1.

NSE-20G™ Standard Product Data Sheet

Preliminary

• Supports switching of arbitrary non-standard octet aggregates.

• Supports unicast, multicast, and broadcast for all switching modes.

• Provides 20 Gbit/s (258,048 DS0s, 10,752 T1s/VT1.5s, 8,064 E1s/VT2s, 384 DS3s/E3s)

switching.

• Works with SBS devices that support up to four 19.44 MHz SBI buses or one 77.76 MHz

SBI336 bus that communicates with PMC-Sierra’s SBI device family. Alternatively, the SBS and SBS-lite devices support up to four 19.44 MHz STS-3 TelecomBuses or one 77.76 MHz STS-12 TelecomBus for connection with PMC-Sierra’s SPECTRA™ family of devices.

• Can be combined in applications with PMC-Sierra’s CHESS™ Set devices (PM5374 TSE

and PM5307 TBS).

• Supports a microprocessor interface which is used to configure/control the NSE, to make

DS0-granularity switch settings.

• Supports clean error checked 8 Mbit/s full-duplex, in-band communications channels from

the NSE’s attached microprocessor to the attached microprocessors of each of the 32 attached SBS336S devices. This channel is used to initialize and control the SBSs, or other such devices, and to implement call-establishment set-up changes.

• Supports JTAG for all non-LVDS signals.

• Requires dual power supplies at 1.8 V and 3.3 V.

• Packaged as a 480 ball UBGA.

• In conjunction with the SBS or SBS-lite, supports “1+1” and “1:N” fabric redundancy.

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2 Applications

The PM8620 Narrowband Switch Element (NSE) supports a variety of flexible Layer 1 and Layer 2 architectures in combination with the following PMC-Sierra devices:

• PM8610 SBS and PM8611 SBS-lite (SBI Serializer and Memory switching stage)

• SBI bus devices (PM8315 TEMUX™/PM5365 TEMAP, FREEDM™ devices, S/UNI®-IMA

devices, AAL1gator™ devices, and other future devices)

• CHESS chip set devices (PM5374 TSE, PM5307 TBS, PM5315 SPECTRA™-2488, and

PM7390 S/UNI®-MACH48)

These architectures include:

• T1/E1 SONET Add/Drop Multiplexers (ADMs)

• TDM ASAP applications

• PHY cards with DS0 (and above) level switching

NSE-20G™ Standard Product Data Sheet

Preliminary

• PSTN replacement switching cores, as part of any-service-any-port applications

• Voice Gateways

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3 References

1. ANSI - T1.105-1995, “Synchronous Optical Network (SONET) – Basic Description

including Multiplex Structure, Rates, and Formats”, 1995.

2. Telcordia - SONET Transport Systems: Common Generic Criteria, GR-253-CORE, Issue 2,

Revision 2, January 1999.

3. ITU, Recommendation G.707 - "Digital Transmission Systems – Terminal equipments -

General", March 1996.

4. IEEE 802.3, “Carrier SeNSE-20G Multiple Access with Collision Detection (CSMA/CD)

Access Method and Physical Layer Specifications”, Section 36.2, 1998.

5. A.X. Widmer and P.A. Franaszek, “A DC-Balanced, Partitioned-Block, 8B/10B Transmission

Code,” IBM Journal of Research and Development, Vol. 27, No 5, September 1983, pp 440-

451.

NSE-20G™ Standard Product Data Sheet

Preliminary

6. U.S. Patent No. 4,486,739, P.A. Franaszek and A.X. Widmer, “Byte Oriented DC Balanced

(0,4) 8B/10B Partitioned Block Transmission Code,” December 4, 1984.

7. IEEE Std 1596.3-1996, “IEEE Standard for Low-voltage Differential Signals (LVDS) for

Scalable Coherent Interface (SCI)”, Approved March 21, 1996

8. L.R. Ford, D.R. Fulkerson, “Flows in Networks'', Maximum Cardinality Matchings in

Bipartite Graphs.

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4 Application Examples

Figure 1 illustrates an OC-48 SONET Ring Add/Drop Multiplexer. The PM5363 TUPP-622 devices align all paths to transport frames in preparation for VT1.5/VT2 granularity switching. The PM8610 SBI336 Bus Serializer (SBS™) and PM8620 Narrowband Switching Element 20G (NSE-20G™) devices support VT1.5/VT2 and above switching. The Add and Drop buses are provided by the SBSs that are not in the SONET Ring path. In this case, they connect to T1 and E1 mapper ports.

Figure 1 An OC-48 T1/E1 ADM (Individually Drop/Add any T1/E1 in STS-48)

NSE-20G™ Standard Product Data Sheet

Preliminary

SPECTRA-

2488

4 X

TUPP-

622

4 X

SBS

NSE20G

4 X

SBS

42 required to terminate

4 X

TUPP-

622

4 X

TEMAP

-84

SPECTRA-

2488

4 X

OCTAL

-LIU **

links for all 4 TEMAPS

Figure 2 illustrates another OC-48 SONET Ring ADM. In this application, the network of three PM5310 TelecomBus Serializers (TBSs) from PMC-Sierra’s CHESS™ chip set add, drop, and groom traffic at STS-1 granularities. The four TUPP-622 devices align any dropped STS-1s (paths to transport frames). The virtual tributary (VT) or tributary unit (TU) switching solution is provided by the SBS-NSE-20G-SBS network below the TUPP-622s. Four SBSs support up to an STS-48 amount of add/drop traffic.

Figure 2 An OC-48 T1/E1 ADM (Drop/Add up to STS-48 at STS-1 Granularity)

SPECTA-

2488

TBS TBS

SPECTA-

2488

TBS

4 X

TUPP-

622

4 X

SBS

NSE20G

SBS

SBI device SBI device SBI device SBI device SBI device SBI device SBI device SBI device SBI device SBI device SBI device SBI device SBI device SBI device SBI device SBI device

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NSE-20G™ Standard Product Data Sheet

Preliminary

Figure 3 illustrates the organization of the access line size card(s) from a SONET Any Service Any Port (ASAP) product. All traffic from the NSE-20G to the SBI link layer devices is pathaligned. See Figure 4 for a description of the PHY line cards compatible with the system in Figure 3.

Figure 3 Any-Service-Any-Port TDM Access Solution

FREEDM-

336

4 X

IMA-84

12 X

AAL1gator-

4 X

TEMUX-84

H-MVIP

Any-PHY

(Packet)

Any-PHY

(Cell)

Any-PHY

(Cell)

Processors

DSP

NSE20G

SBS-

lite

SBS

T1/E1/DS0/N*DS0 Layer 2 Processing

Figure 4 shows the organization of a SONET PHY card compatible with Figure 3. As shown, both Figure 3 and Figure 4 have NSE-20Gs, but only one instance of this device is required to connect all the SBSs. A likely packaging of this combined system would place the NSE-20G (and a standby NSE-20G) on separate fabric cards. In Figure 4, four PM8315 TEMUXs align paths to transport frames. Note: Figure 3 assumes this alignment.

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NSE-20G™ Standard Product Data Sheet

Figure 4 Any-Service-Any-Port DS0-Granularity PHY Card

Preliminary

4 X

TEMUX-84

4 X

TEMUX-84

4 X

TEMUX-84

4 X

TEMUX-84

SPECTRA-

2488

TBS

SONET/T1/E1 Termination - VT/TU/DS0 Switching

SBS

NSE20G

SBS

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5 Block Diagram

The NSE-20G is organized as a DS0 granularity space switch. The NSE-20G may also be organized (with respect to STS-12 boundaries in TelecomBus mode) as a self aligning VT1.5/VT2 granularity space switch. Refer to Figure 5.

Figure 5 NSE-20G Block Diagram Showing TSBs

NSE-20G™ Standard Product Data Sheet

Preliminary

RP[0]

RN[0]

RP[1]

RN[1]

RP[31]

RN[31]

RC1FP

CMP

SYSCLK

LVDS

Receiver

(RXLV)

LVDS

Receiver

(RXLV)

LVDS

Receiver

(RXLV)

Data

Recovery

Unit

(DRU)

Data

Recovery

Unit

(DRU)

Data

Recovery

Unit

(DRU)

Receive

8B/10B

Decoder

(R8TD)

Receive

8B/10B

Decoder

(R8TD)

Receive

8B/10B

Decoder

(R8TD)

1/2

In-Band

Link

Controller

(ILC)

1/2

In-Band

Link

Controller

(ILC)

1/2

In-Band

Link

Controller

(ILC)

DS0 Crossbar Switch

(DCB)

Microprocessor Interface

1/2

In-Band

Link

Controller

(ILC)

1/2

In-Band

Link

Controller

(ILC)

1/2

In-Band

Link

Controller

(ILC)

Transmit

8B/10B

Encoder

(T8TE)

Transmit

8B/10B

Encoder

(T8TE)

Transmit

8B/10B

Encoder

(T8TE)

JTAG

Transmit

Serializer

(PISO)

Transmit Serializer

(PISO)

Transmit Serializer

(PISO)

Clock

Synthesis

Units (2)

LVDS

Transmitt

(TXLV)

LVDS

Transmitt

(TXLV)

LVDS

Transmitt

(TXLV)

Ref

TP[0]

TN[0]

TP[1]

TN[1]

TP[31]

TN[31]

CSB

RSTB

A[11:0]

D[31:0]

ALE

RDB

WRB

INTB

TRSTB

TDI

TCK

TMS

TDO

The R8TD block, in combination with the RXLV and DRU receive, decode and align incoming SBI336/STS-12-equivalent LVDS links. Outputs are provided to the primary switching flow, and to the in-band signaling channel. These provide all analog and digital functions to terminate a full-duplex 777.6 MHz serial SBI336S or 777.6 MHz serial TelecomBus on LVDS.

A 32 x 32 DS0 Crossbar Switch (DCB) stage switches data and control signals between the 32 ports. The switching instructions are stored in two pages of RAM configured as offline and online allowing the user to modify the offline page.

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NSE-20G™ Standard Product Data Sheet

Preliminary

The T8TE block, in combination with the PISO and TXLV perform 8B/10B coding and emits the LVDS bit streams. These provide all analog and digital functions to launch a full-duplex 777.6 MHz serial SBI336S bus or 777.6 MHz serial TelecomBus on LVDS.

The microprocessor bus interface and in-band signaling units (ILC) provide a clean (error checked) channel between the NSE-20G and SBSs. This can be used to send messages between the NSE-20G microprocessor-and the SBS microprocessors in a user defined format.

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6 Description

The PM8620 NSE-20G is a monolithic CMOS integrated circuit packaged in a 480 ball UBGA that performs DS0 and above granularity space switching on 32 SBI336 streams carried as serial SBI336S in 8B/10B coding over LVDS at 777.6 Mbit/s. The NSE-20G also performs VT1.5/VT2 and above granularity switching on 32 STS-12/STM-4 SONET/SDH streams, carried as Serial TelecomBus signals in 8B/10B coding over LVDS at 777.6 Mbit/s.

The NSE-20G is typically used with up to 32 PM8610 SBS or PM8611 SBS-lite devices to provide Memory-Space-Memory switching systems. As each SBS supports either four SBI buses at 19.44 MHz or one SBI336 bus at 77.76 MHz, the overall system supports any mixture of SBI and SBI336 byte serial buses, ranging from 128 19.44 MHz SBI buses to 32 SBI336 77.76 MHz buses that do not exceed an aggregate bandwidth of STS-384, or about 20 Gbit/s. In TelecomBus mode, the SBS devices support the same range of flexibility for 128 19.44 MHz and 32 77.76 MHz TelecomBuses at VT1.5/VT2 granularity

Central to the NSE-20G is a 32 x 32 cross bar switch. At every clock cycle, the cross bar switches a byte of data with control signals from each input port to an output port. The byte of data may be a DS0 channel from a T1/E1 or may be one byte of a column comprising a T1, E1, DS3, E3, VT1.5, VT2 or STS-1.

NSE-20G™ Standard Product Data Sheet

Preliminary

In order for switching to take place all input and output streams must be synchronized. This is done via the RC1FP input signal. When switching T1s, E1s, VTs and other higher order units only SBI336 multiframe alignment is required. The same applies for TelecomBus mode where only frame alignment is required.

An in-band control link over the serial LVDS interface allows the NSE-20G to communicate with the microprocessors attached to the SBS, SBS-lite or other serial SBI336S devices. The effective bandwidth of each inband link to each device is 8 Mbit/s. The inband link provides error detection on 32-byte user messages and some near realtime control signals between devices. Using the near realtime control signals, the NSE-20G is able to synchronize page switching, indicate switchover between working or protected links, and exchange three user defined signals (software) and 8 Auxilliary signals (software). The user and auxilliary signals can be used to indicates interrupts or initiate handshaking between the end point microprocessors. The message format is left to the user of the devices. The only constraint is that each message is a maximum of 32 bytes long.

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NSE-20G™ Standard Product Data Sheet

7 Pin Diagram

The NSE-20G packaged in a 35 mm x 35 mm 480 ball UBGA.

Figure 6 NSE-20G UBGA-480 Ball Diagram (Bottom-View)

34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18

Preliminary

A VSS VSS VSS VSS VDDO VSS NC VSS NC VSS

B VSS AVDH VDDO VDDO VDDO VDDI NC NC NC VDDI

C VSS AVDH AVDH VDDO VDDI

D VSS AVDH AVDH AVDH VDDO

E RESK1 RES1 RN[32] RP[32]

F VSS RN[31] RP[31] AVDL1

Reserved

NC NC VDDI NC

Reserved

VDDI VDDO NC NC

Upper Left

G RN[30] RP[30] RN[29] RP[29]

H VSS TP[32] TN[32] AVDH

J TP[31] TN[31] TP[30] TN[30]

K VSS TP[29] TN[29] VDDI

L RN[28] RP[28] RN[27] RP[27]

M VSS RN[26] RP[26] AVDH

N VDDI AVDL2 RN[25] RP[25]

Reserved

Reserved Reserved Reserved Reserved Reserved Reserved

Reserved

VSS

VDDI

VDDO

VSS

Reserved Reserved Reserved Reserved

Reserved Reserved Reserved

Reserved

VSS VDDI

VDDO VDDI

RSTB

VDDI

P VSS TP[28] TN[28] VDDI

R TP[27] TN[27] TP[26] TN[26]

T TP[25] TN[25] AVDL4 AVDL3

U RN[24] RP[24] AVDL5 CSU_A

VDH

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NSE-20G™ Standard Product Data Sheet

Preliminary

1716151413121110987654321

NC SYSCLK NC VSS NC VSS NC VSS

NC NC NC TCK TMS NC VDDI

Reserved

NC VDDI NC VDDI TDI TDO NC

NC RC1FP VDDI TRSTB VDDI VDDO VDDI CMP

Reserved] Reserved Reserved Reserved Reserved

Upper Right

Reserved

Reserved Reserved Reserved Reserved

Reserved

VSS

VDDO

Reserved

VSS NC VSS VSS VSS VSS A

Reserved Reserved

NC VDDO VDDO VDDO VSS B

VDDI VDDO VDDO AVDH VSS C

NC VDDO AVDH AVDH VSS D

AVDH ATB0[1] AVDH AVDH E

ATB1[1] TN[1] TP[1] VSS F

TN[3] TP[3] TN[2] TP[2] G

AVDH VDDI NC VSS H

RP[1] RN[1] TN[4] TP[4] J

VDDI RP[2] RN[2] VSS K

VDDI AVDL14 RP[3] RN[3] L

AVDH RP[4] RN[4] VSS M

TN[6] TP[6] TN[5] TP[5] N

VDDI TN[7] TP[7] VSS P

RP[5] RN[5] TN[8] TP[8] R

AVDH VDDI AVDL13 VSS T

RP[7] RN[7] RP[6] RN[6] U

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V RN[22] RP[22] RN[23] RP[23]

W VSS AVDL6 VDDI AVDH

Y TP[24] TN[24] RN[21] RP[21]

NSE-20G™ Standard Product Data Sheet

Preliminary

AA VSS TP[23] TN[23] VDDI

Lower Left

AB TP[21] TN[21] TP[22] TN[22]

AC VSS RN[20] RP[20] AVDH

AD RN[19] RP[19] AVDL7 VDDI

AE VSS RN[18] RP[18] VDDI

AF TP[20] TN[20] RN[17] RP[17]

AG VSS NC VDDI AVDH

AH TP[18] TN[18] TP[19] TN[19]

AJ VSS TP[17] TN[17] ATB1[2]

AK AVDH AVDH ATB0[2] AVDH

AL VSS AVDH AVDH VDDO ALE NC VDDI VDDO A[6] A[2] VDDI VDDO D[27] VDDI NC NC VDDI

AM VSS AVDH VDDO VDDO CSB RDB VDDI A[9] A[5] A[3] D[31] D[29] VDDI D[25] VDDI D[21] D[20]

AN VSS VDDO VDDO VDDO INTB WRB NC A[10] A[7] A[4] A[0] D[30] D[28] D[26] NC D[22] D[19]

AP VSS VSS VSS VSS NC VSS A[11] VSS A[8] VSS A[1] VSS NC VSS D[24] D[23] D[18]

34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18

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NSE-20G™ Standard Product Data Sheet

Preliminary

CSU_A

AVDL12 RP[8] RN[8] V

VDH

AVDL10 AVDL11 TN[9] TP[9] W

TN[10] TP[10] TN[11] TP[11] Y

Lower Right

VDDI TN[12] TP[12] VSS AA

RP[9] RN[9] AVDL9 VDDI AB

AVDH RP[10] RN[10] VSS AC

RP[11] RN[11] RP[12] RN[12] AD

VDDI TN[13] TP[13] VSS AE

TP[14] TN[14] TN[15] TP[15] AF

AVDH TN[16] TP[16] VSS AG

RP[13] RN[13] RP[14] RN[14] AH

AVDL8 RP[15] RN[15] VSS AJ

RP[16] RN[16] RES2 RESK2 AK

D[17] VDDO D[13] D[11] D[8] VDDO D[5] D[3] D[0] VDDO NC NC VDDO AVDH AVDH AVDH VSS AL

VDDI D[15] VDDI D[10] D[9] D[7] NC D[2] D[1] NC NC NC NC VDDO AVDH AVDH VSS AM

D[16] D[14] D[12] NC VDDI D[6] D[4] VDDI NC NC NC NC VDDO VDDO VDDO AVDH VSS AN

NC VSS VDDI VSS VDDI VSS NC VSS NC VSS NC VSS VDDO VSS VSS VSS VSS AP

1716151413121110987654321

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8 Pin Description

8.1 Pin Description Table

Pad Name Type Pin No. Function

LVDS Ports (128 Balls)

RP[1]

RN[1]

RP[2]

RN[2]

RP[3]

RN[3]

RP[4]

RN[4]

RP[5]

RN[5]

RP[6]

RN[6]

RP[7]

RN[7]

RP[8]

RN[8]

RP[9]

RN[9]

RP[10]

RN[10]

RP[11]

RN[11]

RP[12]

RN[12]

RP[13]

RN[13]

RP[14]

RN[14]

RP[15]

RN[15]

RP[16]

RN[16]

RP[17]

RN[17]

Analog LVDS Input

AB4

AB3

AC3

AC2

AD4

AD3

AD2

AD1

AH4

AH3

AH2

AH1

AJ3

AJ2

AK4

AK3

AF31

AF32

NSE-20G™ Standard Product Data Sheet

Preliminary

Receive Serial Data. The differential receive serial data

links (RP[31:0]/RN[31:0]) carry the receive SBI336S or SONET/SDH STS-12 frame data from upstream sources in bit serial format. Each differential pair RP[X]/RN[X] carries a constituent SBI336 or STS-12 stream. Data on RP[X]/RN[X] is encoded in an 8B/10B format extended from IEEE Std. 802.3. The 8B/10B character bit ‘a’ is transmitted first and the bit ‘j’ is transmitted last. All RP[X]/RN[X] differential pairs must be frequency locked and phase aligned (within a certain tolerance) to each other. RP[31:0]/RN[31:0] are nominally 777.6 Mbit/s data streams.

Any unused, but available inputs should be tied low using a 10 K resistor.

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Pad Name Type Pin No. Function

RP[18]

RN[18]

RP[19]

RN[19]

RP[20]

RN[20]

RP[21]

RN[21]

RP[22]

RN[22]

RP[23]

RN[23]

RP[24]

RN[24]

RP[25]

RN[25]

RP[26]

RN[26]

RP[27]

RN[27]

RP[28]

RN[28]

RP[29]

RN[29]

RP[30]

RN[30]

RP[31]

RN[31]

RP[32]

RN[32]

Analog LVDS Input

AE32

AE33

AD33

AD34

AC32

AC33

Y31

Y32

V33

V34

V31

V32

U33

U34

N31

N32

M32

M33

L31

L32

L33

L34

G31

G32

G33

G34

F32

F33

E31

E32

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

TP[1]

TN[1]

TP[2]

TN[2]

TP[3]

TN[3]

TP[4]

TN[4]

TP[5]

TN[5]

TP[6]

TN[6]

TP[7]

TN[7]

TP[8]

TN[8]

TP[9]

TN[9]

TP[10]

TN[10]

TP[11]

TN[11]

TP[12]

TN[12]

TP[13]

TN[13]

TP[14]

TN[14]

Analog LVDS Output

AA2

AA3

AE2

AE3

AF4

AF3

Transmit Serial Data. The differential transmit working serial data links (TP[31:0]/TN[31:0]) carry the transmit SBI336S or SONET/SDH STS-12 frame data to a downstream sinks in bit serial format. Each differential pair carries a constituent STS-12 stream. Data on TP[X]/TN[X] is encoded in an 8B/10B format extended from IEEE Std. 802.3. The 8B/10B character bit ‘a’ is transmitted first and the bit ‘j’ is transmitted last. All TP[X]/TN[X] differential pairs are frequency locked and phase aligned (within a certain tolerance) to each other. TP[31:0]/TN[31:0] are nominally 777.6 Mbit/s data streams.

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

TP[15]

TN[15]

TP[16]

TN[16]

TP[17]

TN[17]

TP[18]

TN[18]

TP[19]

TN[19]

TP[20]

TN[20]

TP[21]

TN[21]

TP[22]

TN[22]

TP[23]

TN[23]

TP[24]

TN[24]

TP[25]

TN[25]

TP[26]

TN[26]

TP[27]

TN[27]

TP[28]

TN[28]

TP[29]

TN[29]

TP[30]

TN[30]

TP[31]

TN[31]

TP[32]

TN[32]

NSE-20G Control and Clocking (5 Balls)

SYSCLK Input A16

Analog LVDS Output

AF1

AF2

AG2

AG3

AJ33

AJ32

AH34

AH33

AH32

AH31

AF34

AF33

AB34

AB33

AB32

AB31

AA33

AA32

Y34

Y33

T34

T33

R32

R31

R34

R33

P33

P32

K33

K32

J32

J31

J34

J33

H33

H32

System Clock. The system clock signal (SYSCLK) is the master clock for the NSE-20G device. SYSCLK must be a 77.76 MHz clock, with a nominal 50% duty cycle.

CMP and RC1FP are sampled on the rising edge of SYSCLK.

NSE-20G™ Standard Product Data Sheet

Preliminary

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NSE-20G™ Standard Product Data Sheet

Pad Name Type Pin No. Function

RC1FP Input D16

Reserved Output C17 Reserved pin, must be left floating

CMP Input D10

RSTB Input B18

Receive Serial Interface Frame Pulse. The receive serial interface frame pulse signal (RC1FP) provides system timing for the receive serial interface. RC1FP is supplied in common to all devices in a system containing one or more NSE-20G devices. In TelecomBus mode RC1FP is set high once every 4 frames, in SBI mode without any DS0 switching, or when switching DS0s (WITHOUT CAS) RC1FP is also set high once every 4 frames, or multiple thereof. When in SBI mode switching DS0s WITH CAS RC1FP indicates signaling multiframe alignment by pulsing once every 48 frames or multiples thereof.

A software configurable delay from RC1FP is used to indicate that the C1 multiframe boundary 8B/10B characters have been delivered on all the receive serial data links (RP[32:1]/RN[32:1]) and are ready for processing by the time-space-time switching elements.

RC1FP is sampled on the rising edge of SYSCLK.

Connection Memory Page. The connection memory page select signal (CMP) controls the selection of the connection memory page in the NSE. When CMP is set high, connection memory page 1 is selected. When CMP is set low, connection memory page 0 is selected. Changes to the connection memory page selection are synchronized to the boundary of the next C1FP frame or multiframe depending on the mode:

4-Frame SBI/SBI336 mode:

CMP is sampled at the C1 byte position of the incoming bus on the first frame of the four-frame multiframe. Changes to the connection memory page selection are synchronized to the frame boundary (A1 byte position) of the next four-frame multiframe.

48-Frame SBI/SBI336 mode:

CMP is sampled at the C1 byte position of the incoming bus on the first frame of the 48-frame multiframe. Changes to the connection memory page selection are synchronized to the frame boundary (A1 byte position) of the next 48-frame multiframe.

TelecomBus mode:

CMP is sampled at the C1 byte position of every frame on the incoming bus. Changes to the connection memory pate selection are synchronized to the frame boundary (A1 byte position) of the next frame.

CMP is sampled on the rising edge of SYSCLK at the RC1FP frame position.

Reset Enable Bar. The active low reset signal (RSTB) provides an asynchronous reset for the NSE. RSTB is a Schmitt triggered input with an integral pull-up resistor

Preliminary

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Pad Name Type Pin No. Function

Microprocessor Interface (49 Balls)

CSB Input AM30

RDB Input AM29

WRB Input AN29

Chip Select Bar. The active low chip select signal (CSB) controls microprocessor access to registers in the NSE20G device. CSB is set low during NSE-20G Microprocessor Interface Port register accesses. CSB is set high to disable microprocessor accesses.

If CSB is not required (i.e. register accesses controlled using RDB and WRB signals only), CSB should be connected to an inverted version of the RSTB input.

Read Enable Bar. The active low read enable bar signal (RDB) controls microprocessor read accesses to registers in the NSE-20G device. RDB is set low and CSB is also set low during NSE-20G Microprocessor Interface Port register read accesses. The NSE-20G drives the D[31:0] bus with the contents of the addressed register while RDB and CSB are low.

Write Enable Bar. The active low write enable bar signal (WRB) controls microprocessor write accesses to registers in the NSE-20G device. WRB is set low and CSB is also set low during NSE-20G Microprocessor Interface Port register write accesses. The contents of D[31:0] are clocked into the addressed register on the rising edge of WRB while CSB is low.

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

D[31] D[30] D[29]

D[28]

D[27]

D[26]

D[25] D[24]

D[23] D[22]

D[21]

D[20]

D[19] D[18]

D[17] D[16]

D[15] D[14]

D[13] D[12]

D[11] D[10] D[9]

D[8]

D[7]

D[6]

D[5] D[4]

D[3] D[2]

D[1] D[0]

A[11 A[10]

A[9]

A[8]

A[7]

A[6]

A[5]

A[4]

A[3]

A[2]

A[1]

A{0]

I/O AM24

AN23 AM23

AN22

AL22

AN21

AM21 AP20

AP19 AN19

AM19

AM18

AN18 AP18

AL17 AN17

AM16 AN16

AL15 AN15

AL14 AM14 AM13

AL13

AM12

AN12

AL11 AN11

AL10 AM10

AM9 AL9

Input AP28

AN27

AM27

AP26

AN26

AL26

AM26

AN25

AM25

AL25

AP24

AN24

Microprocessor Data Bus. The bi-directional data bus, D[31:0] is used during NSE-20G Microprocessor Interface Port register reads and write accesses. D[31] is the most significant bit of the data words and D[0] is the least significant bit.

Microprocessor Address Bus. The microprocessor address bus (A[11:0]) selects specific Microprocessor Interface Port registers during NSE-20G register accesses.

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

ALE Input AL30

INTB Open Drain

Output

JTAG Port (5 Balls)

TCK Input B14

TMS Input B13

TDI Input C12

TDO Tri-state C11

TRSTB Input D14

AN30

Address Latch Enable. The address latch enable signal (ALE) is active high and latches the address bus (A[11:0]) when it is set low. The internal address latches are transparent when ALE is set high. ALE allows the NSE-20G to interface to a multiplexed address/data bus. ALE has an integral pull up resistor.

Interrupt Request Bar. The active low interrupt enable signal (INTB) output goes low when an NSE-20G interrupt source is active and that source is unmasked. INTB returns high when the interrupt is acknowledged via an appropriate register access. INTB is an open drain output.

Test Clock. The JTAG test clock signal (TCK) provides timing for test operations that are carried out using the IEEE P1149.1 test access port.

Test Mode Select. The JTAG test mode select signal (TMS) controls the test operations that are carried out using the IEEE P1149.1 test access port. TMS is sampled on the rising edge of TCK. TMS has an integral pull-up resistor.

Test Data Input. The JTAG test data input signal (TDI) carries test data into the NSE-20G via the IEEE P1149.1 test access port. TDI is sampled on the rising edge of TCK. TDI has an integral pull-up resistor.

Test Data Output. TheJTAG test data output signal (TDO) carries test data out of the NSE-20G via the IEEE P1149.1 test access port. TDO is updated on the falling edge of TCK. TDO is a tri-state output which is inactive except when scanning of data is in progress.

Test Reset Bar. The active low JTAG test reset signal (TRSTB) provides an asynchronous NSE-20G test access port reset via the IEEE P1149.1 test access port. TRSTB is a Schmitt triggered input with an integral pullup resistor.

Note that when TRSTB is not being used, it must be connected to the RSTB input.

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

Reserved

Reserved Input

External Resistors (4 Balls)

RES[2]

RES[1]

Analog Input AK2

C29 D29

B6 C6 D6

C7 B8

C8 A9

C9 B10

C19 B19

C20 D20

B20 A20

D21 C21 B21

C22

D22

B22

A22 B23

C24 D24

B24 A24

E33

These pins are reserved. Must be left floating (internally pulled up.)

Reference Resistor Connection. An off-chip 3.16 kΩ

±1% resistor is connected between these the positive resistor reference pin RES and a Kelvin ground contact RESK. An on-chip negative feedback path will force the

1.20 V VREF voltage onto RES, therefore forcing 252 µA of current to flow through the resistor.

NSE-20G™ Standard Product Data Sheet

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Pad Name Type Pin No. Function

RESK[2]

RESK[1]

Analog Test Bus (4 Balls)

ATB0[2]

ATB0[1]

ATB1[2]

ATB1[1]

Analog Input AK1

E34

Analog AK32

Analog AJ31

Reference Resistor Connection. An off-chip 3.16 kΩ ±1% resistor is connected between these the positive resistor reference pin RES and a Kelvin ground contact RESK. An on-chip negative feedback path will force the

1.20 V VREF voltage onto RES, therefore forcing 252 µA of current to flow through the resistor.

Analog test bus for PMC validation and testing.

This pin must be grounded.

Analog test bus for PMC validation and testing.

This pin must be grounded.

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

Digital Core Power (45 Balls)

VDDI[44:0] Power AA4

AB1

AE4

AN10

AN13

AP13

AP15

AM15

AM17

AL18

AM20

AL21

AM22

AL24

AM28

AL28

AG32

AE31

AD31

AA31

W32

P31

N34

K31

B11

D11

D13

C13

The digital core power pins (VDDI[44:0]) should be connected to a well-decoupled +1.8 V DC supply.

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

VDDI[44:0] Power C15

D15

C18

D18

A18

C23

B25

C26

D28

B29

C30

Digital I/O Power (34 Balls)

VDDO[33:0] Power AL5

AM4

AN3

AN4

AN5

AP5

AL8

AL12

AL16

AL23

AL27

AL31

AM31

AM32

AN31

AN32

AN33

A30

B30

B31

B32

C31

D30

D27

D23

D19

D12

The digital I/O power pins (VDDO[33:0]) should be connected to a well-decoupled +3.3 V DC supply.

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

VDDO[33:0] Power D8

Digital Ground (72 Balls)

VSS [71:0] Ground A1

A10

A12

A14

A19

A21

A23

A25

A27

A29

A31

A32

A33

A34

AP1

AP2

AP3

AP4

AP6

AP8

AP10

AP12

AP14

AP16

AP21

AP23

The digital ground pins (VSS [71:0]) should be connected to GND.

NSE-20G™ Standard Product Data Sheet

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Pad Name Type Pin No. Function

VSS [71:0] Ground AP25

AP27

AP29

AP31

AP32

AP33

AP34

AA1

AC1

AE1

AG1

AJ1

AL1

AM1

AN1

B34

C34

D34

F34

H34

K34

M34

P34

W34

AA34

AC34

AE34

AG34

AJ34

AL34

AM34

AN34

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

Analog Power (8 Balls)

AVDL[7:0] Power F31

N33

W33

AD32

AJ4

AB2

Clock Synthesis 1.8 V Power (6 Balls)

CSU_AVDL[5:0] Power T31

T32

U32

Clock Synthesis 3.3 V Power (2 Balls)

CSU_AVDH[0:1] Power U31

The analog power pins (AVDL[7:0]) should be connected to a well-decoupled +1.8 V DC supply. These pins supply the RXLVs.

The clock synthesis pins (CSU_AVDL[5:0]) should be connected to a well-decoupled +1.8 V DC supply. These pins supply the CSUs.

These two pins should be connected to a well-decoupled +3.3 V DC supply.

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

Analog I/O Power (34 Balls)

AVDH[33:0] Power H4

AC4

AG4

AL2

AL3

AL4

AM2

AM3

AN2

B33

C32

C33

D31

D32

D33

AG31

AC31

W31

M31

H31

AK31

AK33

AK34

AL32

AL33

AM33

The analog I/O power pins (AVDH[33:0]) should be connected to a well-decoupled +3.3 V DC supply.

NSE-20G™ Standard Product Data Sheet

Preliminary

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Pad Name Type Pin No. Function

No Connect (50 Balls)

NC[49:0] AG33

AP30

AL29

AN28

AP22

AN20

AL20

AL19

AP17

AN14

AM11

AP11

AN9

AP9

AM8

AN8

AM7

AL7

AN7

AP7

AL6

AM6

AN6

AM5

C10

A11

B12

A13

C14

A15

B15

B16

C16

D17

The No Connect pins (NC[49:0]) should be left floating.

NSE-20G™ Standard Product Data Sheet

Preliminary

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NSE-20G™ Standard Product Data Sheet

Preliminary

Pad Name Type Pin No. Function

B17

A17

D25

C25

D26

B26

A26

C27

B27

C28

B28

A28

TOTAL 480

Notes on Pin Description

1. All NSE-20G inputs and bi-directional balls except the LVDS links present minimum capacitive loading and operate at TTL logic levels.

2. Inputs RSTB, ALE, TMS, TDI and TRSTB have internal pull-up resistors.

3. All outputs have a minimum 8 mA drive capability – this includes TDO, INTB and D[31:0]).

4. The VDDI and AVDL power pins are not internally connected to each other. Failure to connect these pins externally may cause malfunction or damage to the device.

5. The AVDH, CSU_AVDH and VDDO power pins are not internally connected to each other. Failure to connect these pins externally may cause malfunction or damage to the device.

6. The VDDI, VDDO, AVDH, CSU_AVDH and AVDL power pins all share the common ground VSS.

7. To prevent damage to the device and to ensure proper operation, power must be applied simultaneously to all 3.3 V power pins followed by power to all the 1.8 V power pins followed by input pins driven by signals.

8. To prevent damage to the device, power must first be removed from input pins followed by the removal of power from all the 1.8 V power supply pins followed by the simultaneous removal of power from all the 3.3 V power pins.

9. The 3.3 V supplies should never be less than the 1.8 V supplies at any time during power-up and power-down.

8.2 Analog Power Filtering Recommendations

To achieve best performance of the LVDS links, an analog filter network should be installed between the power balls and the supply.

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NSE-20G™ Standard Product Data Sheet

Table 1 Analog Power Filters

Rs Cl Ch Notes

CSU AVDH (2 balls) 3.3 ohm 100 nF 10 nF One Filter network per VDD ball.

CSU AVDL (6 balls) 0.47 ohm 4.7 µF 10 nF One Filter network per VDD ball.

AVDH (34 balls) 3.3 ohm 1.0 µF 10 nF Two VDD balls per filter network1.

AVDL (8 balls) 0 ohm 100 nF 10 nF One Filter network per VDD ball.

Note

1. Two power-gnd pairs can use the same filter.

Figure 7 Analog Power Filter Circuit

Preliminary

Supply VDD

Supply VSS

Device VDD

Device VSS

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9 Functional Description

9.1 LVDS Overview

The LVDS family of cells allow the implementation of 777.6 Mbit/s LVDS links. A reference clock of 77.76 MHz is required.

A generic LVDS link according to IEEE 1596.3-1996 is illustrated in Figure 8 below. The transmitter drives a differential signal through a pair of 50 Ω characteristic interconnects, such as board traces, backplane traces, or short lengths of cable. The receiver presents a 100 Ω differential termination impedance to terminate the lines. Included in the standard is a sufficient common-mode range for the receiver to accommodate as much as 925 mV of common-mode ground difference.

Figure 8 Generic LVDS Link Block Diagram

Transmitter Interconnect Receiver

NSE-20G™ Standard Product Data Sheet

Preliminary

ΩZo=50

100Ω

Zo=50Ω

Complete Serializer/Deserializer (SERDES) transceiver functionality is provided. Ten-bit parallel data is sampled by the line rate divided-by-10 clock (77.76 MHz SYSCLK) and then serialized at the line rate on the LVDS output pins by a 777.6 MHz clock synthesized from SYSCLK. Serial line rate LVDS data is sampled and de-serialized to 10-bit parallel data. Parallel output transfers are synchronized to a gated line rate divided-by-10 clock. The 10-bit data is passed to an 8B/10B decoding block. The gating duty cycle is adjusted such that the throughput of the parallel interface equals the receive input data rate (Line Rate +/- 100 ppm). It is expected that the clock source of the transmitter is the same as the clock source of the receiver to ensure the data throughput at both ends of the link are identical.

Data is guaranteed to contain sufficient transition density to allow reliable operation of the data recovery units by 8B/10B block coding and decoding provided by the T8TE and R8TD blocks.

At the system level, reliable operation will be obtained if proper signal integrity is maintained through the signal path and the receiver requirements are respected. Namely, a worst case eye opening of 0.7UI and 100 mV differential amplitude is needed. These conditions should be achievable with a system architecture consisting of board traces, two sets of backplane connectors, up to 1 m of backplane interconnect. This assumes proper design of 100 Ω differential lines and minimization of discontinuities in the signal path. Due to power constraints, the output differential amplitude is approximately 350 mV

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The LVDS system is comprised of the LVDS Receiver (RXLV), LVDS Transmitter (TXLV), ), Transmitter reference (TXREF), data recovery unit (DRU), parallel to serial converter (PISO and Clock Synthesis Unit (CSU).

9.1.1 LVDS Receiver (RXLV)

The RXLV block is a 777.6 Mbit/s Low Voltage Differential Signaling (LVDS) Receiver according to the IEEE 1596.3-1996 LVDS Specification.

The RXLV block is the receiver in Figure 8, accepting 777.6 Mbit/s LVDS signals from the transmitter, over RP[X]/RN[X] pins, amplifying them and converting them to digital signals, then passing them to a data recovery unit (DRU). Holding to the IEEE 1596.3-1996 specification, the RXLV has a differential input sensitivity better than 100 mV, and includes at least 25 mV of hysteresis. There are 32 RXLV blocks in the NSE.

9.1.2 LVDS Transmitter (TXLV)

The TXLV block is a 777.6 Mbit/s Low voltage Differential Signaling (LVDS) Transmitter according to the IEEE 1596.3-1996 LVDS Specification.

NSE-20G™ Standard Product Data Sheet

Preliminary

The TXLV accepts 777.6 Mbit/s differential data from a “parallel-in, serial-out” (PISO) circuit and then transmits the data off-chip as a low voltage differential signal on TP[X]/TN[X] pins.

The TXLV uses a reference current and voltage from the TXREF block to control the output differential voltage amplitude and the output common-mode voltage.

There are 32 instances of the TXLV block in the NSE-20G.

9.1.3 LVDS Transmit Reference (TXREF)

The TXREF provides an on-chip bandgap voltage reference (1.20 V ±5%) and a precision current to the TXLV (777.6 Mbit/s LVDS Transmitter) block’s. The reference voltage is used to control the common-mode level of the TXLV output, while the reference current is used to control the output amplitude.

The precision currents are generated by forcing the reference voltage across an external, off-chip

3.16 kΩ(±1%) resistor. The resulting current is then mirrored through several individual reference

current outputs, so each TXLV receives its own reference current.

There are two instances of the TXREF in the NSE-20G.

9.1.4 Data Recovery Unit (DRU)

The DRU is a fully integrated data recovery and serial to parallel converter that can be used for

777.6 Mbit/s NRZ data. 8B/10B block code is used to guarantee transition density for optimal

performance.

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The DRU recovers data and outputs a ten-bit word synchronized with a line rate divided by ten, gated clock to allow frequency deviations between the data source and the local oscillator. The output clock is not a recovered clock. The DRU accumulates 10 data bits and outputs them on the next clock edge. If 10-bits are not available for transfer at a given clock cycle, the output clock is gated.

The DRU provides moderate high frequency jitter tolerance suitable for inter-chip serial link applications. It can support frequency deviations up to ±100ppm.

There are 32 instances of the DRU on the NSE-20G.

9.1.5 Parallel to Serial Converter (PISO)

The PISO is a parallel-to-serial converter designed for high-speed transmit operation, supporting up to 777.6 Mbit/s.

There are 32 instances of the PISO on the NSE-20G.

9.1.6 Clock Synthesis Unit (CSU)

NSE-20G™ Standard Product Data Sheet

Preliminary

The CSU is a fully integrated clock synthesis unit. It generates low jitter multi-phase differential clocks at 777.6 MHz for the use by the transmitter.

There are two instances of the CSU on the NSE-20G.

9.2 Receive 8B/10B Frame Aligner (R8TD)

The Receive 8B/10B serial SBI336S Bus frame aligner, R8TD, frames to the receive stream to find 8B/10B character boundaries. It also contains a FIFO to bridge between the timing domain of the receive LVDS links and the system clock timing domain. The R8TD blocks perform framing and elastic store functions on data retrieved from the receive LVDS links, RP[x]/RN[x].

9.2.1 FIFO Buffer

The FIFO buffer sub-block provides isolation between the timing domains of the associated receive LVDS link and that of the system clock, SYSCLK. Data with arbitrary alignment to the 8B/10B characters, are written into a 10-bit by 24-word deep FIFO at the link clock rate. Data is read from the FIFO at every SYSCLK cycle.

9.3 Transmit 8B/10B Encoder (T8TE)

The Transmit 8B/10B Encoder blocks, T8TE, construct an 8B/10B character stream from an incoming translated SBI336 or TelecomBus carrying an STS-12/STM-4 equivalent channelized stream. The T8TE block corrects the running disparity of an 8B/10B character stream and buffers data in a FIFO before transmission to the transmit serializer block. A total of 32 T8TE blocks are instantiated in the NSE-20G device.

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In SBI mode, these blocks encode the SBI336S stream as shown in Table 2. When configured for Synchronous mode for DS0 switching, the 8B/10B encoder transmits CAS signaling multiframe alignment across the SBI336S interface by generating a C1FP character every 48 frame times. When not configured for DS0 switching, the C1FP character is sent every four frames.

9.3.1 SBI336S 8B/10B Character Encoding

Table 2 shows the mapping of SBI336S bus control bytes and signals into 8B/10B control characters. The linkrate octet in location V4, V1 and V2, the in-band programming channel, and the V3 octet when it contains data are all carried as data. Justification requests for master timing are carried in the V5 character so there are three V5 characters used: nominal, negative timing adjustment request, positive timing adjustment request.

Table 2 SBI336S Character Encoding

NSE-20G™ Standard Product Data Sheet

Preliminary

Code Group Name

Common to All Link Types

K28.5 001111 1010 110000 0101 IC1FP=’b1

K23.7- 111010 1000 - Overhead Bytes (columns 1-60 or 1-72

Asynchronous T1/E1 Links

K27.7- 110110 1000 - V5 byte, no justification request

K28.7- 001111 1000 - V5 byte, negative justification request

K29.7- 101110 1000 - V5 byte, positive justification request

Synchronous T1/E1 Links

K27.7- 110110 1000 - V5 byte

Asynchronous DS3/E3 Links

K27.7- 110110 1000 - V5 byte, no justification request

K28.7- 001111 1000 - V5 byte, negative justification request*

K29.7- 101110 1000 - V5 byte, positive justification request*

Fractional Rate Links

K28.7- 001111 1000 - V5 byte, send one extra byte request**

K29.7- 101110 1000 - V5 byte, send one less byte request**

Floating Transparent Virtual Tributaries

K27.7- 110110 1000 -

K27.7+ - 001001 0111 V5 byte

Curr. RDabcdei fghj

Curr. RD+ abcdei fghj

Encoded Signals Description

C1FP frame and multiframe alignment

except for C1 and in-band programming channel), V3 or H3 byte except during negative justification, byte after V3 or H3 byte during positive justification, unused bytes in fraction rate links

V5 byte IV5=1, IDATA[0,4] = ERDI[1:0] = ‘b00, IDATA[5] = REI = ‘b0

IV5=1, IDATA[0,4] = ERDI[1:0] = ‘b00, IDATA[5] =

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NSE-20G™ Standard Product Data Sheet

Preliminary

Code Group Name

K28.7- 001111 1000 -

K28.7+ - 110000 0111 V5 byte

K29.7- 101110 1000 -

K29.7+ - 010001 0111 V5 byte

K30.7- 011110 1000 -

K30.7+ - 100001 0111 V5 byte

Curr. RDabcdei fghj

Curr. RD+ abcdei fghj

Encoded Signals Description

REI = ‘b1

V5 byte IV5=1, IDATA[0,4] = ERDI[1:0] = ‘b01, IDATA[5] = REI = ‘b0

IV5=1, IDATA[0,4] = ERDI[1:0] = ‘b01, IDATA[5] = REI = ‘b1

V5 byte IV5=1, IDATA[0,4] = ERDI[1:0] = ‘b10, IDATA[5] = REI = ‘b0

IV5=1, IDATA[0,4] = ERDI[1:0] = ‘b10, IDATA[5] = REI = ‘b1

V5 byte IV5=1, IDATA[0,4] = ERDI[1:0] = ‘b11, IDATA[5] = REI = ‘b0

IV5=1, IDATA[0,4] = ERDI[1:0] = ‘b11, IDATA[5] = REI = ‘b1

* Note there can be multiple V5s per SBI frame when in DS3 or E3 mode but only one justification can occur per SBI frame. Positive and negative justification request through V5 required by the SBI336S interface should be limited to one per frame.

** Note fractional rate links are symmetric in the transmit and receive direction over SBI336S. When using clock slave mode with a fractional rate link the clock master makes single byte adjustments to the slaves rate once per frame.

9.3.2 Serial TelecomBus 8B/10B Character Encoding

Table 3 shows the mapping of TelecomBus control bytes and signals into 8B/10B control characters. When the TelecomBus control signals conflict each other, the 8B/10B control characters are generated according to the sequence of the table, with the characters at the top of the table taking precedence over those lower in the table.

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Table 3 Serial TelecomBus Character Encoding

NSE-20G™ Standard Product Data Sheet

Preliminary

Code Group Name

High Order Path Termination (HPT) Mode

K28.5 001111 1010 110000 0101 IC1FP=’b1

K28.0- 001111 0100 - IPL=’b0

K28.0+ - 110000 1011 IPL=’b0

K28.6 001111 0110 110000 1001 IC1FP=’b1,

Low Order Path Termination (LPT) Mode

K28.4+ - 110000 1101 ITAIS=’b1

K27.7- 110110 1000 -

K27.7+ - 001001 0111 IV5=’b1,

K28.7- 001111 1000 - IV5=’b1,

K28.7+ - 110000 0111 IV5=’b1,

K29.7- 101110 1000 -

K29.7+ - 010001 0111

K30.7- 011110 1000 - IV5=’b1,

Curr. RDabcdei fghj

Curr. RD+ abcdei fghj

Encoded Signals Description

IPL=’b0

C1FP frame and multiframe alignment

High-order path H3 byte position, no negative justification event.

High-order path PSO byte position, positive justification event.

IPL=’b1

High-order path frame alignment (J1).

Low-order path AIS.

IV5=’b1, IDATA[0,4] = ERDI[1:0] = ‘b00, IDATA[5] = REI = ‘b0

Low order path frame alignment. ERDI and REI are encoded in the V5 byte.

IDATA[0,4] = ERDI[1:0] = ‘b00, IDATA[5] = REI = ‘b1

Low order path frame alignment. ERDI and REI are encoded in the V5 byte.

IDATA[0,4] = ERDI[1:0] = ‘b01, IDATA[5] = REI = ‘b0

Low order path frame alignment. ERDI and REI are encoded in the V5 byte.

IDATA[0,4] = ERDI[1:0] = ‘b01, IDATA[5] = REI = ‘b1

Low order path frame alignment. ERDI and REI are encoded in the V5 byte.

IV5=’b1, IDATA[0,4] = ERDI[1:0] = ‘b10, IDATA[5] = REI = ‘b0

Low order path frame alignment. ERDI and REI are encoded in the V5 byte.

IV5=’b1, IDATA[0,4] = ERDI[1:0] = ‘b10, IDATA[5] = REI = ‘b1

Low order path frame alignment. ERDI and REI are encoded in the V5 byte.

IDATA[0,4] = ERDI[1:0] = ‘b11, IDATA[5] = REI = ‘b0

Low order path frame alignment. ERDI and REI are encoded in the V5 byte.

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NSE-20G™ Standard Product Data Sheet

Preliminary

Code Group Name

K30.7+ - 100001 0111

K23.7- 111010 1000 000101 0111 ITPL=’b0

Curr. RDabcdei fghj

Curr. RD+ abcdei fghj

Encoded Signals Description

IV5=’b1, IDATA[0,4] = ERDI[1:0] = ‘b11, IDATA[5] = REI = ‘b1

Low order path frame alignment. ERDI and REI are encoded in the V5 byte.

Non low-order path payload bytes.

9.3.3 Serial SBI336S and TelecomBus Alignment

The alignment functionality preformed by each receiver can be broken down into two parts, character alignment and frame alignment. Character alignment finds the 8B/10B character boundary in the arbitrarily aligned incoming data. Frame alignment finds SBI336S or TelecomBus frame and multiframe boundaries within the Serial link.

The character and frame alignment are expected to be robust enough for operation over a cabled interconnect.

9.3.4 Character Alignment Block

Character alignment locates character boundaries in the incoming 8B/10B data stream. The character alignment algorithm may be in one of two states, in-character-alignment state and outof-character-alignment state. The two states of the character alignment algorithm is shown in Figure 9.

When the character alignment state machine is in the out-of-character-alignment state, it maintains the current alignment, while searching for a C1FP character. If it finds the C1FP character it will re-align to the C1FP character and move to the in-character-alignment state. The C1FP character is found by searching for the 8B/10B C1FP character, K28.5+ or K28.5-, simultaneously in ten possible bit locations. While in the in-character-alignment state, the state machine monitors LCVs. If 5 or more LCVs are detected within a 15 character window the character alignment state machine transitions to out-of-character-alignment state. The special characters listed in Table 2 and Table 3 are ignored for LCV purposes. Upon return to incharacter-alignment state the LCV count is cleared.

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Figure 9 Character Alignment State Machine

5-in-15 LCVs

NSE-20G™ Standard Product Data Sheet

Preliminary

out-of-

character-

alignment

9.3.5 Frame Alignment

Frame alignment locates SBI or TelecomBus frame and multiframe boundaries in the incoming 8B/10B data stream. The frame alignment state machine may be in one of two states, in-framealignment state and out-of-frame-alignment state. Each SBI336S frame is 125 µS in duration.

In SBI mode: Encoded over the SBI336S frame alignment is SBI336S multiframe alignment which is every four SBI336S frames or 500 µS. When carrying DS0 traffic in synchronous mode, signaling multiframe alignment is also necessary and is also encoded over SBI336S alignment. Signaling multiframe alignment is every 24 frames for T1 links and every 16 frames for E1 links, therefore signaling multiframe alignment covering both T1 and E1 multiframe alignment is every 48 SBI336S frames or 6 ms. Therefore C1FP characters are sent every four or every 48 frames.

in-

character-

alignment

Found C1FP Character

In TelecomBus mode: Encoded over the serial link is the tributary multiframe alignment, which is every four frames or 500 µS. Multiframe alignment is required so that a downstream device can extract the T1 or E1 data from the tributary. The multiframe information is preserved by only sending out C1FP characters every four frames.

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NSE-20G™ Standard Product Data Sheet

Preliminary

The frame alignment state machine establishes frame alignment over the link and is based on the frame and not the multiframe alignments. When the frame alignment state machine is in the outof-frame-alignment state, it maintains the current alignment, while searching for a C1FP character. When it finds the C1FP character the state machine transitions to the in-framealignment state. While in the in-frame-alignment state, the state machine monitors out-of-place C1FP characters. Out-of-place C1FP characters are identified by maintaining a frame counter based on the C1FP character. The counter is initialized by the C1FP character when in the out-ofcharacter-alignment state, and is unaffected in the in-character-alignment state. If three consecutive C1FPs have been found that do not agree with the expected location as defined by the frame counter, the state will change to out-of-frame-alignment state.

The frame alignment state machine is also sensitive to character alignment. When the character alignment state machine is in the out-of-character-alignment state, the frame alignment state machine is forced out-of-alignment, and is held in that state until the character alignment state machine transitions to the in-character alignment state.

Figure 10 Frame Alignment State Machine

out-offrame-

alignment

3 consecutive out-of-place

C1FPs or

out-of-character alignment

in-frame-

alignment

Found C1FP and

not (out-of-character alignment)

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9.3.6 SBI336S Multiframe Alignment

SBI336S multiframe alignment is communicated across the link by controlling the frequency of the C1FP character. The most frequent transmission of the C1FP character is every four SBI336S frame times. This is the SBI336S multiframe and is used when there are no synchronous tributaries requiring signalling multiframe alignment on the SBI336S bus. When there are synchronous tributaries on the SBI336S bus the C1FP character is transmitted every 48 frame times. This is the CAS signaling multiframe and is the lowest common multiple of the 24 frame T1 multiframe and the 16 frame E1 multiframe.

The SBI336S multiframe and signaling multiframe alignment is based a free running multiframe counter that is reset with each C1FP character received. Under normal operating conditions each received C1FP character will coincide with the free running multiframe counter. SBI336S multiframe alignment is always required, SBI336S signaling multiframe alignment is optional and only required when synchronous tributaries are supported with DS0 level switching.

9.4 DS0 Cross Bar switch (DCB)

Each of 32 R8TD blocks provides an eight-bit data signal on each 77.76 MHz clock edge. These signals are the STS-12 frame aligned ingress octets. Likewise, each of 32 egress T8TE blocks expects to receive a STS-12 frame aligned signal on each clock edge. The DS0 Cross Bar switch (DCB) connects these inputs to these outputs.

NSE-20G™ Standard Product Data Sheet

Preliminary

The DCB constitutes a Space switch that connects each output to some input during each clock period in the STS-12 frame structure. The STS-12 frame structure consists of 12*9*90 = 9720 octets (of overheads and payload). Being a DS0 granularity space switch, the DCB must provide separate switch settings for each of these 9720 octet times.

These 9720 switch settings are stored in an on-chip SRAM. Each of 32 egress ports must be told which of each of thirty-two ingress ports it should read during each of the 9720 clock periods. Five bits are required to specify which ingress port should be read by each output. Thus, we require 9720 words of five bits each for thirty-two egress ports. Thus each clock period requires 32 *5 = 160 bits. To support controlled switchover from one set of switch settings to another, we require two banks of 9720 words each. The aggregate memory requirement is 2 X 9720 X 160b = 3,110,400b of SRAM. The table below illustrates the mapping of this memory. Each control page in the table is a vector of 160 bits containing five bits (specifying the source port) for each of 32 egress ports. One page will be on-line translating ports in the core switch while the other is offline for CPU update. When the new configuration is ready, and the appropriate system synchronized frame boundary arrives, the pages will be swapped.

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NSE-20G™ Standard Product Data Sheet

Preliminary

Table 4 Switching Control RAM layout

Control Page 0 Control Page 1

RAM Address STS Row Col STS Row Col

0111111

1211211

……

9719 12 9 90 12 9 90

The multiplexers that select the inputs for each egress port are straight forward 32-to-1 multiplexers. They require five bits of control during each 77.76 MHz clock cycle. Their outputs go to the T8TEs. This design permits unicast, multicast, and broadcast.

9.5 Clock Synthesis and Transmit Reference Digital Wrapper (CSTR)

The CSTR contains the configuration registers for the CSU and TXREF LVDS analog locks.

9.6 Fabric Latency

The flow of octets from ingress LVDS to egress LVDS has variable latency, depending on the timing of the arriving LVDS stream, and the clock variation on the egress LVDS drivers. A reasonable estimate of the NSE’s latency can be arrived at by making assumptions about the depths of the receive and transmit FIFOs: we assume the “C1” timing is set to maintain about four samples in the ingress FIFO; the egress FIFO is designed to be centered at four samples – so typically delay due to FIFOs will be eight clock cycles. The latency through the space switch stage is three clock cycles. Data latency through the analog blocks is around 90 ns. The typical latency of the NSE-20G is 24 clock cycles or 308 ns. With worst case conditions in both FIFOs, latency rises to 36 clock cycles or 463 ns.

9.7 JTAG Support

The NSE-20G provides JTAG support for testing device interconnection on a PC board.

9.8 Microprocessor Interface

The Microprocessor Interface Block provides the logic required to interface the normal mode and test mode registers within the NSE-20G to a generic microprocessor bus. The normal mode registers are used during normal operation to configure and monitor the NSE. The register set is accessed as shown in the Register Memory Map table below. Addresses that are not shown are not used and must be treated as Reserved.

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9.9 In-band Link Controller (ILC)

In order to permit centralized control of distributed NSE/SBS fabrics from the NSE-20G microprocessor interface (for applications in which NSEs are located on fabric cards, and SBSs are located on multiple line cards), an in-band signaling channel is provided between the NSE20G and the SBS over the Serial SBI336S interface. Each NSE-20G can control up to 32 SBSs that are attached by the LVDS links. The NSE-SBS in-band channel is full duplex, but the NSE20G has active control of the link.

The in-band channel is carried in the first 36 columns of four rows of the SBI structure, rows 3, 6, 7 and 8. The overall in-band channel capacity is thus 36*4*64 Kbit/s = 9.216 Mbit/s. Each 36 bytes per row allocated to the in-band signaling channel is its own in-band message between the end points. Four bytes of each 36 byte inband message are reserved for end-to-end control information and error protection, leaving 8.192 Mbit/s available for data transfer between the end points.

The data transferred between the end points has no fixed format, effectively providing a clear channel for packet transfer between the attached microprocessors at each of the LVDS link terminating devices. The user is able to send and receive any packet up to 32 bytes in length. The last two reserved bytes of the 36 byte in-band message is a CRC-16 which detects errors in the message. This block provides a microprocessor interface to the in-band signaling channel.

NSE-20G™ Standard Product Data Sheet

Preliminary

This in-band channel is expected to be used almost entirely to carry out switching control changes in the SBSs. To configure a DS0 in an SBS device most often requires a local microprocessor to write to one memory location consisting of a 16-bit address and a 16-bit data. Using this as a baseline and assuming an efficient use of the in-band channel bandwidth we can set a maximum of (32bytes/row * 4 rows/frame * 8000 frames/sec / 4 bytes/write) 256,000 DS0 configurations per second.

Considering that configuring a T1 when switching DS0s requires 27 DS0 writes indicates that the in-band signaling channel bandwidth sets maximum limit of over 9000 T1 configurations per second. In real life these limits will not be achieved but this shows that the in-band link should not be the bottleneck. In TelecomBus mode this same configuration will require only three writes per T1 link. Another more efficient communication scheme could be used to increase this performance.

In N+1 protected architectures it is likely that full configuration of a port card will be necessary during the switchover. This would require the entire connection memory be reconfigured. Assuming connections for overhead bytes are also reconfigured, the fastest that a complete reconfiguration can take place is 9720 register writes for each of the two configuration pages in the SBS. This equates to (2 * 9720 writes * 4 bytes/write / (32 bytes/row * 4 rows/frame * 8000 frames/second)) 76 milliseconds. It is also possible that the spare card could hold all the connection configurations for all the port cards it is protecting locally, for even faster switch over.

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9.9.1 In-Band Signaling Channel Fixed Overhead

The In-Band Link Controller block generates and terminates two bytes of fixed header and a CRC-16 per every 32 byte in-band message (total 36 bytes). The two byte header provides control and status between devices at the ends of the LVDS link. The CRC-16 is calculated over the 32 byte (and header - 34 bytes) in-band message and provides the terminating end the ability to detect errors in the in-band message. The format of the in-band message and header bytes is shown in Figure 11 and Figure 12.

Figure 11 In-Band Signaling Channel Message Format

1 byte 1 byte 32 bytes 2 bytes

Header1 Header2 Free Format Information CRC-16

Figure 12 In-Band Signaling Channel Header Format

Header1

Bit 7 Bit 6 Bit 5 Bit4 Bit3 Bit2 Bit1 Bit 0

VALID LINK[1:0] PAGE[1:0] USER[2:0]

NSE-20G™ Standard Product Data Sheet

Preliminary

Header2

Bit 7 Bit 6 Bit 5 Bit4 Bit3 Bit2 Bit1 Bit 0

AUX[7:0]

Table 5 In-band Message Header Fields

Field Name NSE-20G to SBS SBS to NSE

Valid Message slot contains a message(1)

or is empty(0). If empty this message will not be put into Rx Message FIFO (other header information processed as usual)

Link[1:0]#

These bits are optional for SBI336S devices, intended for devices which have multiple redundant links. Each bit either indicates which Link to use, Working(0) or Protect(1) when sourced from the master device, or which link is being used, when sourced from the slave device. Other algorithms are possible to indicate Working or Protect over these 2 bits but all SBI336S devices must be able to revert back to this meaning.

Transmitted immediately.

Message slot contains a message(1) or is empty(0). If empty this message will not be put into Rx Message FIFO (other header information processed as usual)

Transmitted immediately.

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Field Name NSE-20G to SBS SBS to NSE

Page[1:0]# Each bit indicates which control page

to use, page 1 or 0, two bits, bit 1 for the ingress MSU and bit 0 for the egress MSU.

Only transmitted from the beginning of the first message of the frame

User[2:0]#

Aux[7:0]# User defined auxiliary register

User defined register indication to SBS reflected in the SBS as external hardware signal outputs.

Transmitted immediately.

indication to SBS.

Transmitted immediately.

Each bit shows current control page in use, page 1 or 0, two bits, bit 1 for the ingress MSU and bit 0 for the egress MSU.

Only transmitted from the beginning of the first message of the frame.

User defined register indication to NSE-20G from external hardware inputs to the SBS.

Transmitted immediately.

User defined auxiliary register indication to NSE.

Transmitted immediately.

# Change in these bits(received side) will not be processed if the received message CRC-16 indicates an error.

Interrupts can be generated when CRC errors are detected or the USER or LINK bits change state. There is no inherent flow control provided by the In-Band Link Controller. The attached microprocessor is able to provide flow control via interrupts when the in-band message FIFO overflows and via the USER and Auxiliary bits in the header.

As each message arrives, the CRC-16 and valid bit is checked; if the valid bit is not set the message is discarded, if it fails the CRC check it is flagged as being in error and an interrupt is generated if enabled. If the CRC-16 is ok, regardless of the valid bit, the Page Link, User and Aux bits are passed on immediately. If the fifo erroneously overflows, an interrupt is generated.

9.10 Microprocessor Interface

The following register map shows the registers used to provide control of the NSE. The first 100h addresses provide access to the top level NSE-20G configuration and control registers, the Clock synthesis units through the CSTR blocks and the DSO Crossbar (DCB) The DCB is the space switch at the core of the NSE. From 100h are 32 identical, 20 h spaces used to control the ports of the NSE-20G on an individual basis. Each port has an In-Band Link Controller (ILC), an 8B/10B encoder (T8TE) and an 8B/10B decoder (R8TD). These blocks provide functions specific to the ports such as Line Code Violation counts (for data integrity monitoring) and receive and transmit in-band link message buffers. Table 6 shows the registers. Only port 0 is fully described as the other ports are identical, being incrementally distributed from address 100h in 20h steps.

Table 6 NSE-20G Register Map

Address Register

000 NSE-20G Master Reset

001 NSE-20G Individual Channel Reset

002 NSE-20G Master JTAG ID

003 SBS Page select – Page 0

004 SBS Page select – Page 1

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NSE-20G™ Standard Product Data Sheet

Address Register

005 NSE-20G Master Interrupt Source

006 NSE-20G Master ILC Interrupt Source

007 NSE-20G Master R8TD Interrupt Source

008 NSE-20G Master T8TE Interrupt Source

009 NSE-20G Master Clock Monitor

00A NSE-20G DCB CMP select

00B NSE-20G Master Interrupt Enable

00C NSE-20G Subsystem Interrupt Enable

00D NSE-20G R8TD TIP

00E SBS User Bits 0

00F SBS User Bits 1

010 SBS User Bits 2

011 NSE-20G FREE User Register

012 R8TD_RX_C1 Pulse Monitor Register

013 Unexpected R8TD_RX_ C1 Interrupt Register

014 Missing R8TD_RX_ C1 Interrupt Register

015 Unexpected R8TD_RX_ C1 Interrupt Enable Register

016 Missing R8TD_RX_ C1 Interrupt Enable Register

017 RSTD C1

01C-01F Reserved

020 CSTR #1 Control

021 CSTR #1 Interrupt Enable and CSU Lock Status

022 CSTR #1 Interrupt Indication

023 Reserved

024 CSTR #2 Control -

025 CSTR #2 Configuration and Status

026 CSTR #2 Interrupt Status -

027-03F Reserved

040 DCB CONFIGURATION PORT 31-30 REGISTER -

041 DCB CONFIGURATION PORT 29-24 REGISTER

042 DCB CONFIGURATION PORT 23-18 REGISTER -

043 DCB CONFIGURATION PORT 17-12 REGISTER -

044 DCB CONFIGURATION PORT 11-6 REGISTER

045 DCB CONFIGURATION PORT 5-0 REGISTER

046 DCB CONFIGURATION OUTPUT REGISTER

047 DCB ACCESS MODE REGISTER

048 DCB C1 DELAY (RC1FP) REGISTER

04A DCB FRAME SIZE REGISTER

04C DCB CONFIGURATION REGISTER

04D DCB INTERRUPT REGISTER

Preliminary

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Address Register

04E – 0FF Reserved

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100-1FF

100 Port Register Set 0: R8TD Control and Status

101 Port Register Set 0: R8TD Interrupt Status

102 Port Register Set 0: R8TD LCV Count

103 Port Register Set 0: RXLV and DRU Control

0106 – 107 Port Register Set 0: Reserved

108 Port Register Set 0: T8TE Control and Status

109 Port Register Set 0: T8TE Interrupt Status

10A Port Register Set 0: T8TE Time-slot Configuration #1

10B Port Register Set 0: T8TE Time-slot Configuration #2

10C Port Register Set 0: T8TE Test Pattern

10D Port Register Set 0: TXLV and PISO Control

10F Port Register Set 0: Reserved

110 Port Register Set 0: ILC Transmit Message FIFO Data

111 Port Register Set 0: ILC Transmit Control

112 Port Register Set 0: ILC Transmit Status and FIFO Synch

113 Port Register Set 0: ILC Receive Message FIFO DATA

114 Port Register Set 0: ILC Receive Control

115 Port Register Set 0: ILC Receive Status and FIFO Synch

116 Port Register Set 0: ILC Interrupt enable and Control

117 Port Register Set 0: ILC Interrupt reason Register

118-11F Reserved

120-13F Port Register Set 1 – Port 1 (Channel 1)

140-15F Port Register Set 2 – Port 2 (Channel 2)

160-17F Port Register Set 3 – Port 3 (Channel 3)

180-19F Port Register Set 4 – Port 4 (Channel 4)

1A0-1BF Port Register Set 5 – Port 5 (Channel 5)

1C0-1DF Port Register Set 6 – Port 6 (Channel 6)

1E0-1FF Port Register Set 7 – Port 7 (Channel 7)

200-21F Port Register Set 8 – Port 8 (Channel 8)

220-23F Port Register Set 9 – Port 9 (Channel 9)

240-25F Port Register Set 10 – Port 10 (Channel 10)

260-27F Port Register Set 11 – Port 11 (Channel 11)

280-29F Port Register Set 12 – Port 12 (Channel 12)

2A0-2BF Port Register Set 13 – Port 13 (Channel 13)

2C0-2DF Port Register Set 14 – Port 14 (Channel 14)

2E0-2FF Port Register Set 15 – Port 15 (Channel 15)

Port Register Set 0 – Port 0 (Channel 0)

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Address Register

300-31F Port Register Set 16 – Port 16 (Channel 16)

320-33F Port Register Set 17 – Port 17 (Channel 17)

340-35F Port Register Set 18 – Port 18 (Channel 18)

360-37F Port Register Set 19 – Port 19 (Channel 19)

380-39F Port Register Set 20 – Port 20 (Channel 20)

3A0-3BF Port Register Set 21 – Port 21 (Channel 21)

3C0-3DF Port Register Set 22 – Port 22 (Channel 22)

3E0-3FF Port Register Set 23 – Port 23 (Channel 23)

400-41F Port Register Set 24 – Port 24 (Channel 24)

420-43F Port Register Set 25 – Port 25 (Channel 25)

440-45F Port Register Set 26 – Port 26 (Channel 26)

460-47F Port Register Set 27 – Port 27 (Channel 27)

480-49F Port Register Set 28 – Port 28 (Channel 28)

4A0-4BF Port Register Set 29 – Port 29 (Channel 29)

4C0-4DF Port Register Set 30 – Port 30 (Channel 30)

4E0-4FF Port Register Set 31 – Port 31 (Channel 31)

500-7FF Reserved

Preliminary

800 – FFF

Notes on Register Memory Map

1. For all register accesses, CSB must be low.

2. Addresses that are not shown must be treated as Reserved.

Reserved for Test

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10 Normal Mode Register Description

Normal mode registers are used to configure and monitor the operation of the NSE. Normal mode registers (as opposed to test mode registers) are selected when A[11] is set low.

Notes on Normal Mode Register Bits

1. Writing values into unused register bits has no effect. However, to ensure software compatibility with future, feature-enhanced versions of this product, unused register bits must be written with logic zero. Reading back unused bits can produce either a logic one or a logic zero; hence, unused register bits should be masked off by software when read.

2. All configuration bits that can be written into can also be read back. This allows the processor controlling the TSB to determine the programming state of the block.

3. Writeable normal mode register bits are cleared to logic zero upon reset unless otherwise noted.

4. Writing into read-only normal mode register bit locations does not affect NSE-20G operation unless otherwise noted.

NSE-20G™ Standard Product Data Sheet

Preliminary

5. For registers above 100H, only a one port set of the 32 ports are shown. The Register addresses are shown for example as: 0100H + N*20H, N here is the port number between 0 and 31. This is done to prevent unnecessary duplication of otherwise identical register sets.

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Bit Type Function Default

Bit 31 R/W DRESET 0

Bit 30 R/W ARESET 0

Bit 29:0 R Unused X

This register allows separate software reset of digital and analog circuitry on the NSE.

ARESET

The ARESET bit allows the analog circuitry in the NSE-20G to be reset under software control. If the ARESET bit is a logic one, all the NSE-20G analog circuitry is held in reset. ARESET must be held at logic one for at least 100us to ensure correct reset of the CSU. This bit is not self-clearing. Therefore, a logic zero must be written to bring the NSE-20G out of reset. Holding the NSE-20G in a reset state places it into a low power, analog stand-by mode. A hardware reset clears the ARESET bit, thus negating the analog software reset.

DRESET

The DRESET bit allows the digital circuitry in the NSE-20G to be reset under software control. If the DRESET bit is a logic one, all the NSE-20G digital circuitry is held in reset. This bit is not self-clearing. Therefore, a logic zero must be written to bring the NSE-20G out of reset. Holding the NSE-20G in a reset state places it into a low power, digital stand-by mode. A hardware reset clears the DRESET bit, thus negating the digital software reset.

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Bit Type Function Default

Bit 31:0 R/W RESET[31:0]* 1

This register allows power saving by holding individual channels in reset.

RESET[n]

The RESET[n] bit allows the channel circuitry in the NSE-20G to be reset under software control. If the RESET[n] bit is a logic one, the NSE-20G channel circuitry for a particular channel is held in reset. RESET[n] does not affect the reset of the CSU. This bit is not selfclearing. Therefore, a logic zero must be written to bring the channel out of reset. Holding the channel in a reset state places it into a low power, analog stand-by mode. A hardware reset or software DRESET bit 000h sets the RESET[n] bit.

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Bit Type Function Default hex

Bit 31:28 R ID[3:0] 0h

Bit 27:12 R DEVID[15:0] 8620h

Bit 11:0 R

JTAG Identification Code

[MID[10:0] and JID]

0CDh

The NSE-20G Master JTAG ID registers hold the JTAG identification code for the device. The device revision number and device id are available through these registers.

ID[3:0]

The ID bits can be read to provide a binary NSE-20G revision number.

DEVID[15:0]

The DEVID bits can be read to distinguish the NSE-20G from other members of the NSE20G family of devices.

MID[10:0]

The MID bits provide the manufacturer identity field in the JTAG identification code.

JID

The JID bit is bit 0 in the JTAG identification code.

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Bit Type Function Default

Bit 31:0 R/W Page0_SBS[31:0]* 0

Page0_SBS[n]

This bit will be the Page 0 bit sent to SBSn over the In-Band channel – where n is any SBS connected to LVDS links numbered from 0 to 31.

Preliminary

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Bit Type Function Default

Bit 31:0 R/W Page1_SBS[31:0]* 0

Page1_SBS[n]

This bit will be the Page 1 bit sent to SBSn over the In-Band channel – where n is any SBS connected to LVDS links numbered from 0 to 31.

Preliminary

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Bit Type Function Default

Bit 31:8 R Unused X

Bit 7 R R8C1EXTRAINT 0

Bit 6 R R8C1MISSINT 0

Bit 5 R CSU2INT 0

Bit 4 R CSU1INT 0

Bit 3 R R8TDINT 0

Bit 2 R T8TEINT 0

Bit 1 R ILCINT 0

Bit 0 R DCBINT 0

R8C1EXTRAINT

If the R8C1EXTRAINT bit is a logic one, an interrupt of unexpected C1 character in one of the R8TD_C1_INT blocks has occurred. The source of the R8C1EXTRAINT bit comes from the Register 013h.

R8C1MISSINT

If the R8C1MISSINT bit is a logic one, an interrupt of missing C1 characters in one of the R8TD_C1_INT blocks has occurred. The source of the R8C1MISSINT bit comes from the Register 014h.

CSU2INT

If the CSU2INT bit is a logic one, an interrupt has been generated by CSU #2. The CSTR Interrupt register must be read to clear this interrupt.

CSU1INT

If the CSU1INT bit is a logic one, an interrupt has been generated by CSU #1. The CSTR Interrupt register must be read to clear this interrupt.

R8TDINT

If the R8TDINT bit is a logic one, an interrupt has been generated by one of the R8TD blocks. The internal R8TD Interrupt register must be read to clear this interrupt. Which R8TD caused the interrupt can be ascertained by reading the NSE-20G R8TD Interrupt Source Register.

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T8TEINT

If the T8TEINT bit is a logic one, an interrupt has been generated by one of the T8TE blocks. The internal T8TE Interrupt register must be read to clear this interrupt. Which T8TE caused the interrupt can be ascertained by reading the NSE-20G T8TE Interrupt Source Register.

ILCINT

If the ILCINT bit is a logic one, an interrupt has been generated by one of the ILC blocks. The relevant ILC Interrupt register must be read to clear this interrupt. Which ILC caused the interrupt can be ascertained by reading the NSE-20G ILC Interrupt Source Register.

DCBINT

If the DCBINT bit is a logic one, an interrupt has been generated by the DCB block. The DCB Interrupt register must be read to clear this interrupt.

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NSE-20G™ Standard Product Data Sheet

Bit Type Function Default

Bit 31:0 R ILCINT[31:0]* 0

ILCINT[n]

If the ILCINT[n] bit is a logic one, an interrupt has been generated by that ILC block. The relevant ILC Interrupt register must be read to clear this interrupt.

Preliminary

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NSE-20G™ Standard Product Data Sheet

Bit Type Function Default

Bit 31:0 R R8TDINT[31:0]* 0

R8TDINT[n]

If the R8TDINT[n] bit is a logic one, an interrupt has been generated by that R8TD block. The relevant R8TD Interrupt register must be read to clear this interrupt.

Preliminary

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Bit Type Function Default

Bit 31:0 R T8TEINT[31:0]* 0

T8TEINT[n]

If the T8TEINT[n] bit is a logic one, an interrupt has been generated by that T8TE block. The relevant T8TE Interrupt register must be read to clear this interrupt

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Bit Type Function Default

Bit 31:2 R Unused X

Bit 1 R RC1FPA X

Bit 0 R SYSCLKA X

When a monitored clock signal makes a low to high transition, the corresponding register bit is set high. The bit will remain high until this register is read, at which point all the bits in this register are cleared. A lack of transitions is indicated by the corresponding register bit reading low. This register should be read at periodic intervals to detect clock failures.

SYSCLKA

The SYSCLK active bit (SYSCLKA) detects low to high transitions on the SYSCLK input. SYSCLKA is set high on a rising edge of SYSCLK, and is set low when this register is read.

RC1FPA

The RC1FP active bit (RC1FPA) detects low to high transitions on the RC1FP input. RC1FPA is set high on a rising edge of RC1FP, and is set low when this register is read.

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Bit Type Function Default

Bit 31:2 R Unused X

Bit 1 R/W CMP_SRC 0

Bit 0 R/W CMP_VAL 0

The connection memory page select signal (CMP) controls the selection of the connection memory page in the NSE. When CMP is set high, connection memory page 1 is selected. When CMP is set low, connection memory page 0 is selected. Changes to the connection memory page selection are synchronized to the boundary of the next C1FP multiframe.

This Register controls a software override to the CMP pin.

CMP_SRC

This bit dictates whether CMP is to be sourced from software when set to ‘1’ or from the external CMP pin when set to 0.

CMP_VAL

CMP_VAL is used to provide the CMP signal when CMP_SRC is set to ‘1’ other wise this bit is ignored.

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Bit Type Function Default

Bit 31:1 R Unused X

Bit 0 R/W INTE 0

This register allows the CPU to disable or enable NSE-20G interrupts with a single write.

INTE

This bit, when ‘1’, enables the INTB pin on the NSE. When set to ‘0’ INTB is held ‘1’.

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Bit Type Function Default

Bit 31:6 R Unused X

Bit 5 R/W TOPINTE 0

Bit 4 R/W CSUINTE 0

Bit 3 R/W R8TDINTE 0

Bit 2 R/W T8TEINTE 0

Bit 1 R/W ILCINTE 0

Bit 0 R/W DCBINTE 0

This register allows the CPU to disable or enable NSE-20G Subsystem interrupts with a single write.

TOPINTE

This bit, when ‘1’, enables the generation of interrupts from the Top_level i.e. R8C1EXTRAINT and R8C1MISSINT interrupts. When set to ‘0’ R8C1EXTRAINT and R8C1MISSINT interrupts are disabled .

CSUINTE

This bit, when ‘1’, enables the generation of interrupts from CSU1 and CSU2 control. When set to ‘0’ CSU1 and CSU2 control interrupts are disabled .

R8TDINTE

This bit, when ‘1’, enables the generation of interrupts from R8TD blocks. When set to ‘0’ all R8TD interrupts are disabled .

T8TEINTE

This bit, when ‘1’, enables the generation of interrupts from T8TE blocks. When set to ‘0’ all T8TE interrupts are disabled .

ILCINTE

This bit, when ‘1’, enables the generation of interrupts from ILC blocks. When set to ‘0’ all ILC interrupts are disabled .

DCBINTE

This bit, when ‘1’, enables the generation of interrupts from the DCB block. When set to ‘0’ DCB interrupts are disabled .

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Bit Type Function Default

Bit 31:1 R Unused X

Bit 0 R TIP 0

This register allows the CPU to determine if the TIP signals from all the R8TDs are inactive indicating no transfers in progress.

TIP

This bit, when ‘1’, indicates one or more of the TIP signals from each of the R8TDs is active. It is the result of all TIP signals ORed together.

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Bit Type Function Default

Bit 31:0 R/W SBS_USER_0[31:0] 0

SBS_USER_0[n]

This bit will be the USER 0 bit sent to SBSn over the In-Band channel – where n is any SBS connected to LVDS links numbered from 0 to 31*

Preliminary

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Bit Type Function Default

Bit 31:0 R/W SBS_USER_1[31:0] 0

SBS_USER_1[n]

This bit will be the USER 1 bit sent to SBSn over the In-Band channel – where n is any SBS connected to LVDS links numbered from 0 to 31*

Preliminary

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Bit Type Function Default

Bit 31:0 R/W SBS_USER_2[31:0] 0

SBS_USER_2[n]

This bit will be the USER 2 bit sent to SBSn over the In-Band channel – where n is any SBS connected to LVDS links numbered from 0 to 31.

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Bit Type Function Default

Bit 31:8 R Unused X

Bit 7:0 R/W FREE[7:0] 0

FREE[7:0]

The software ID register (FREE) holds whatever value is written into it. Reset clears the contents of this register. This register has no impact on the operation of the NSE.

Preliminary

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Bit Type Function Default

Bit 31:0 R R8C1_OK_INT[31:0] 0

R8C1_OK_INT[n]

This bit will be set to ‘1’ if both oc1fp[n] and r8_rx_c1[n] have occurred at the same time. Otherwise, it will be stay at ‘0’. Read access will clear this bit.

See section 12.5 for a description of the proper use of this register.

Preliminary

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Bit Type Function Default

Bit 31:0 R R8C1_EXTRA_INT[31:0] 0

R8C1_EXTRA_INT[n]

This bit will be set to ‘1’ if oc1fp[n] has not occurred at the time when r8_rx_c1[n] has occurred. Otherwise, it will stay at ‘0’. Read access will clear this bit.

See section 12.5 for a description of the proper use of this register.

Preliminary

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Bit Type Function Default

Bit 31:0 R R8C1_MISS_INT[31:0] 0

R8C1_MISS_INT[n]

This bit will be set to ‘1’ if r8_rx_c1[n] has not occurred at the time when oc1fp[n] has occurred. Otherwise, it will stay at ‘0’. Read access will clear this bit.

See section 12.5 for a description of the proper use of this register.

Preliminary

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Preliminary

Bit Type Function Default

Bit 31:0 R/W R8C1_EXTRA_INTE[31:0] 0

R8C1_EXTRA_INTE[n]

R8C1_EXTRA_INTE[n] is used to enable/disable ( ‘1’ for enable; ‘0’ for disable) the R8C1_EXTRA_INT[n] (defined in Reg 013h) to cause interrupt. This is on per channel basis.

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Bit Type Function Default

Bit 31:0 R/W R8C1_MISS_INTE[31:0] 0

R8C1_MISS_INTE[n]

R8C1_MISS_INTE[n] is used to enable/disable ( ‘1’ for enable; ‘0’ for disable) the R8C1_MISS_INT[n] (defined in Reg 014h) to cause interrupt. This is on per channel* basis.

Preliminary

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Bit Type Function Default

Bit 31-16 Unused X

Bit 15 R/W Reserved[11] 0

Bit 14 R/W Reserved[10] 0

Bit 13 R/W Reserved[9] 0

Bit 12 R/W Reserved[8] 0

Bit 11 R/W Reserved[7] 0

Bit 10 R/W Reserved[6] 1

Bit 9 R/W Reserved[5] 0

Bit 8 R/W Reserved[4] 0

Bit 7 R/W Reserved[3] 0

Bit 6 R/W Reserved[2] 0

Bit 5 R/W Reserved[1] 0

Bit 4 R/W CSU_ENB 0

Bit 3 R/W CSU_RSTB 1

Bit 2 Unused X

Bit 1 Unused X

Bit 0 R/W Reserved[0] 1

NSE-20G™ Standard Product Data Sheet

Preliminary

This register provides reset control and enable control for CSTR blocks #1 through #2

Reserved[11:0]

The Reserved bits must be set to the indicated default value for correct operation of the NSE.

CSU_RSTB

The CSU_RSTB signal is a software reset signal that forces the CSU into reset. The CSU is reset when the CSU_RSTB is logic zero. The CSU is also reset by the NSE-20G master analog reset signal. When the CSU is reset, the reset signal should be held for at least 100us.

CSU_ENB

The CSU enable control signal (CSU_ENB) bit forces the CSU into low power configuration. The CSU is disabled when CSU_ENB is logic one. The CSU is enabled when CSU_ENB is logic zero.

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Preliminary

Bit Type Function Default

Bit 31-2 R Unused X

Bit 1 R LOCKV X

Bit 0 R/W LOCKE 0

This register configures the operation of CSTR blocks #1 through #2*.

LOCKE

The CSU lock interrupt enable bit (LOCKE) controls the contribution of CSU lock state interrupts by the CSTR to the device interrupt INTB. When LOCKE is high, INTB is asserted low when the CSU lock state changes. Interrupts due to CSU lock state are masked when LOCKE is set low.

LOCKV

The CSU lock status bit (LOCKV) indicates whether the clock synthesis unit has successfully locked with the system clock. LOCKV is set low when the CSU has not successfully locked with the reference clock. LOCKV is set high if when the CSU has locked with the reference clock.

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Bit Type Function Default

Bit 31-1 R Unused X

Bit 0 R LOCKI X

LOCKI

The CSU lock interrupt status bit (LOCKI) reports and acknowledges changes in the CSU lock state. LOCKI is set high when the CSU achieves lock with the reference clock or loses its lock to the reference clock. LOCKI is cleared on a read to this register when WCIMODE is logic zero. LOCKI is cleared on a write (of any value) to this register when WCIMODE is logic one. INTB is asserted low when both LOCKE and LOCKI are high. If LOCKE is asserted, LOCKI must be cleared before INTB will be reasserted.

Preliminary

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Bit Type Function Default

Bit 31-10 R Unused X

Bit 9-5 R/W Port31[4:0] 0

Bit 4-0 R/W Port30[4:0] 0

Port31[4:0]

This register selects the input port number to map to output port 31 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port30[4:0]

This register selects the input port number to map to output port 30 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Preliminary

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Bit Type Function Default

Bit 31-30 R Unused X

Bit 29-25 R/W Port29[4:0] 0

Bit 24-20 R/W Port28[4:0] 0

Bit 19-15 R/W Port27[4:0] 0

Bit 14-10 R/W Port26[4:0] 0

Bit 9-5 R/W Port25[4:0] 0

Bit 4-0 R/W Port24[4:0] 0

Port29[4:0]

This register selects the input port number to map to output port 29 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port28[4:0]

Preliminary

This register selects the input port number to map to output port 28 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port27[4:0]

This register selects the input port number to map to output port 27 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port26[4:0]

This register selects the input port number to map to output port 26 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port25[4:0]

This register selects the input port number to map to output port 25 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port24[4:0]

This register selects the input port number to map to output port 24 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

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Bit Type Function Default

Bit 31-30 R Unused X

Bit 29-25 R/W Port23[4:0] 0

Bit 24-20 R/W Port22[4:0] 0

Bit 19-15 R/W Port21[4:0] 0

Bit 14-10 R/W Port20[4:0] 0

Bit 9-5 R/W Port19[4:0] 0

Bit 4-0 R/W Port18[4:0] 0

Port23[4:0]

This register selects the input port number to map to output port 23 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port22[4:0]

Preliminary

This register selects the input port number to map to output port 22 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port21[4:0]

This register selects the input port number to map to output port 21 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port20[4:0]

This register selects the input port number to map to output port 20 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port19[4:0]

This register selects the input port number to map to output port 19 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port18[4:0]

This register selects the input port number to map to output port 18 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

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Bit Type Function Default

Bit 31-30 R Unused X

Bit 29-25 R/W Port17[4:0] 0

Bit 24-20 R/W Port16[4:0] 0

Bit 19-15 R/W Port15[4:0] 0

Bit 14-10 R/W Port14[4:0] 0

Bit 9-5 R/W Port13[4:0] 0

Bit 4-0 R/W Port12[4:0] 0

Port17[4:0]

This register selects the input port number to map to output port 17 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port16[4:0]

Preliminary

This register selects the input port number to map to output port 16 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port15[4:0]

This register selects the input port number to map to output port 15 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port14[4:0]

This register selects the input port number to map to output port 14 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port13[4:0]

This register selects the input port number to map to output port 13 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port12[4:0]

This register selects the input port number to map to output port 12 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

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Bit Type Function Default

Bit 31-30 R Unused X

Bit 29-25 R/W Port11[4:0] 0

Bit 24-20 R/W Port10[4:0] 0

Bit 19-15 R/W Port9[4:0] 0

Bit 14-10 R/W Port8[4:0] 0

Bit 9-5 R/W Port7[4:0] 0

Bit 4-0 R/W Port6[4:0] 0

Port11[4:0]

This register selects the input port number to map to output port 11 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port10[4:0]

Preliminary

This register selects the input port number to map to output port 10 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port9[4:0]

This register selects the input port number to map to output port 9 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port8[4:0]

This register selects the input port number to map to output port 8 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port7[4:0]

This register selects the input port number to map to output port 7 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port6[4:0]

This register selects the input port number to map to output port 6 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

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Preliminary

Bit Type Function Default

Bit 31-30 R Unused X

Bit 29-25 R/W Port5[4:0] 0

Bit 24-20 R/W Port4[4:0] 0

Bit 19-15 R/W Port3[4:0] 0

Bit 14-10 R/W Port2[4:0] 0

Bit 9-5 R/W Port1[4:0] 0

Bit 4-0 R/W Port0[4:0] 0

Port5[4:0]

This register selects the input port number to map to output port 5 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port4[4:0]

This register selects the input port number to map to output port 4 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port3[4:0]

This register selects the input port number to map to output port 3 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port2[4:0]

This register selects the input port number to map to output port 2 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port1[4:0]

This register selects the input port number to map to output port 1 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

Port0[4:0]

This register selects the input port number to map to output port 0 of the DCB for an arbitrary position in the SBI336/TelecomBus frame.

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Bit Type Function Default

Bit 31-30 R Unused X

Bit 29-0 R CFG_O[29:0] 0

CFG_O[29:0]

This field contains configuration data read from the offline connection memory page. Configuration data in this field is read from the location specified by the WORDADDR and PORTADDR fields specified in the Access Mode register. There is a 6 SYSCLK cycle latency from when an indirect read is requested until the time when correct data appears in this register.

Preliminary

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Preliminary

Bit Type Function Default

Bit 31 R/W WRB 1

Bit 30 R/W ACCMDE 0

Bit 29 R Unused X

Bit 28-24 R/W PORTCFG[4:0] 0

Bit 23-21 R Unused X

Bit 20-16 R/W PORTADDR[4:0] 0

Bit 15-14 R Unused X

Bit 13-0 R/W WORDADDR [13:0] 0

Writing to this register with the WRB register bit set high initiates an indirect read from the offline connection memory page. WORDADDR selects the offline connection memory page to read from. There is a latency of six SYSCLK cycles from when this register is written to with the WRB bit set high until when valid data appears on the Configuration Output register. Indirect reads should be spaced at least six SYSCLK cycles apart to permit valid data to appear in the Configuration Output register.

Writing to this register with the WRB register bit set low initiates an indirect write to the offline connection memory page. WORDADDR selects the offline connection memory page to write to. Indirect writes should be spaced at least four SYSCLK cycles apart to ensure the writes complete successfully.

While page copy is in progress (UPDATEV register bit = ‘1’), writing to this register will NOT cause data to be updated to/from the offline connection memory page.

While a page swap is pending (SWAPV register bit = ‘1’), writing to this register MAY cause unpredictable results as data may be transferred while a page swap is occurring, causing data to be updated to a different connection memory page from the intended.

WRB

The indirect access control bit selects between a write (0) or read (1) access to the offline connection memory page.

ACCMDE

These bits indicate the access mode of the offline connection memory page.

0: PORT transfer mode. 1: WORD transfer mode.

In port transfer mode, one port is updated per word of the offline connection memory page.

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PORTCFG: new port mapping to be updated to the connection memory page. WORDADDR: specifies the address of the offline connection memory page. PORTADDR: port address of the offline connection memory page.

In word transfer mode, an entire word of the offline connection memory page is updated.

PORTCFG: is ignored. WORDADDR: specifies the address to the offline connection memory page. PORTADDR: is ignored.

In either mode, the contents read from the off-line connection memory page can be read by the microprocessor through the Configuration Output register..

PORTCFG[4:0]

This field contains the input port mapping to a particular output port specified in PORTADDR. Used only in PORT transfer mode. At all other modes, this field is ignored.

Preliminary

PORTADDR[4:0]

When performing writes to the offline connection memory page, this field indicates the output port to be updated with new mapping in PORTCFG. A PORTADDR of 0 relates to output port 0 of the DCB.

This field is valid in PORT transfer mode and during reading from the Configuration Output register and is ignored in WORD transfer mode. Valid values are 0-31 when performing writes.

When performing reads through the Configuration Output register, PORTADDR indicates the ports being read as follows :

000xx : ports 5-0 001xx : ports 11-6 010xx : ports 17-12

011xx : ports 23-18

100xx : ports 29-24

101xx : ports 31-30 on least significant bits

110xx : ports 5-0 111xx : ports 5-0

WORDADDR[13:0]

This field indicates the address of the update connection memory page to be accessed. This field relates to the time location within the SBI/TelecomBus frame. I.e. Location 0 would be the first A1 byte of the frame and location 24 is the C1 character.

This field is ignored in page copy mode. Valid values are 0-9719.

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Bit Type Function Default

Bit 31-6 R Unused X

Bit 13-0 R/W RC1DLY[13:0] 0

RC1DLY

This value, .equaling the delay (in 77.76 MHz clock periods), between RC1FP and the arrival of the C1 characters in the R8TD. This delay will synchronize the C1 input to the R8TD blocks assuming all the C1 characters have arrived. As the delay on those links is dependent on the system design, backplane propagation delays, cable lengths etc. This value will have to be arrived at empirically. And will have an upper an lower limit for which the middle value should be selected. The Operations section for more detail and some recommended starting values.

MF_SWAP Legal Range (clock cycles)

Preliminary

00 26 – 9716

01 26 – 16383

10 26 – 16383

11 26 – 16383

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Bit Type Function Default

Bit 31-14 R Unused X

Bit 13-0 R/W FRMSZ[13:0] 9719

This register specifies the frame size of the SBI or TelecomBus frame.

FRMSZ[13:0]

This register specifies the size of the connection memory page in various switching modes. Legal values :

1079: TelecomBus switching.

1079: SBI column switching.

9719: SBI DS0 switching.

Preliminary

9719: SBI DS0 switching with CAS.

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Bit Type Function Default

Bit 31- 8 R Unused X

Bit 7-6 R/W MF_SWAP[1:0] 0

Bit 5 R/W AUTO 0

Bit 4 R/W SWAP_PE 0

Bit 3 R/W UPDATEE 0

Bit 2 R/W FRAMEE 0

Bit 1 R SWAPPV 0

Bit 0 R UPDATEV 0

MF_SWAP [1:0]

This bit selects when RC1FP is expected and synchronizes when page swaps can occur. The table below relates MFSWAP to all vital variables from the DCB:

Preliminary

MFSWAP Config-uration

Page Size

Frame Switching @ (9720 byte

Frame Interrupt

RC1FP expected every

Switching Mode

frame)

00 1080 1 frame 1 frame 4 frame TelecomBus

01 1080 4 frame 4 frame 4 frame SBI column

mode

10 9720 4 frame 4 frame 4 frame SBI DS0 mode

11 9720 48 frame 48 frame 48 frame SBI DS0 with

CAS

AUTO

This bit enables an automatic copy of the online connection memory page to the offline connection memory page after the connection memory page is switched. Toggling the AUTO bit to ‘0’ while a page copy is in progress will terminate the page copy process.

0: automatic update disabled. 1: automatic update enabled.

If automatic page copying is used, the page copy will take place automatically whenever the connection memory page swaps. This means that the UPDATEV register bit will be asserted immediately following a change from 1 to 0 in the SWAPV register bit. When the AUTO bit is set, access to the offline connection memory page is restricted from when a page swap is pending until when the page copy is complete.

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Datasheet PM8620-BIAP Datasheet (PMC)

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

List of Registers

List of Tables

8.1 Pin Description Table

9.2 Receive 8B/10B Frame Aligner (R8TD)

9.3 Transmit 8B/10B Encoder (T8TE)

9.4 DS0 Cross Bar switch (DCB)

9.5 Clock Synthesis and Transmit Reference Digital Wrapper (CSTR)

9.9 In-band Link Controller (ILC)

10 Normal Mode Register Description