Datasheet ADSP-21MOD970 Datasheet (Analog Devices)

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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

ADSP-21mod970-110

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999

Multiport Internet

Gateway Processor Solution

FEATURES High Density

Implements Six Modem Channels in One Package

304-Ball PBGA with a 1.45 Square Inch (961 sq. mm.)

Footprint ISDN B-Channel HDLC DATA Modulations

CCITT V.90 (30 kbps–56 kbps) K56Flex™ (30 kbps–56 kbps) ITU-T V.34: 33600 Bits/s–2400 Bits/s CCITT V.32bis: 14400 Bits/s–7200 Bits/s CCITT V.32: 9600 Bits/s, 4800 Bits/s CCITT V.23 CCITT V.22/V.22bis: 2400, 1200, 600 Bits/s CCITT V.21: 300 Bits/s Bell 212A: 1200 Bits/s Bell 103: 300 Bits/s

Start-Up Procedures:

ITU-T V.8

Error Correction and Data Compression:

CCITT V.42 Error Correction (LAPM and MNP2-4) CCITT V.42bis Data and MNP Class 5 Compression

FAX Modem

V.17/V.29/V.27ter/V.21 Channel 2

T.30 Protocol V.120 V.110 PPP Asynchronous Framing Support (RFC 1662) Low Power

80 mW per Channel Typical Active

Low Power and Sleep Modes

On-Chip DS0/DS1 Interface

Full Function DMA Port

No External Memory Required

3.3 V Supply Fully Upgradable RAM-Based Architecture Fast Download

Full Image in 5 ms High Speed 16-Bit Port Link Bus Provides Simple

Interface Between Host and Modem Pool

K56Flex is a trademark of Rockwell International and Lucent Technologies.

INTRODUCTION

The ADSP-21mod970-110 is a six-channel solution intended for remote access server and remote access concentrator applications. It combines a highly integrated DSP processor with downloadable software. All datapump and controller functions are implemented on a single 1.45-square-inch chip. This modem package allows the highest modem port density while achieving the lowest power consumption in a software upgradable platform.

The ADSP-21mod970-110 is designed for high-density systems such as remote access servers, see Figure 1. Its high performance DSP core, large on-chip SRAM, TDM serial port and 16-bit DMA port provide efficient control and data communication with minimal chip count. The modem software provides a number of data modulations, such as V.34, 56 kbps PCM and ISDN with a software upgrade path to future standards and new applications, such as voice over network. The host interface allows system access to modem statistics such as call progress, connect speed and modulation parameters such as retrain count and symbol rate.

ON-CHIP SRAM

The ADSP-21mod970-110 processor integrates 960K bytes of on-chip memory. The modem datapump and controller software, as well as data storage, are contained in the on-chip SRAM. The SRAM cells are designed by Analog Devices. These cells are optimized for high speed digital signal processing and low power consumption. You can dynamically configure the ADSP-21mod970-110 with software through the 16-bit DMA interface.

DMA INTERFACE

The 16-bit internal DMA port (DMA Port) provides transparent, direct access to the on-chip RAM of the ADSP-21mod970-110 processor. This high speed access to on-chip memory simplifies control and data communication and system debug. Use the 16-bit DMA interface to dynamically configure the ADSP21mod970-110 with software.

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DMA

ADSP-21mod970

SP0

LAN

INTERNET

T1 E1

PRI

xDSL

ATM

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

PORT LINK BUS

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

HOST

ADSP-2183

ADSP-21mod970 FUNCTIONS V.34/56k MODEM

V.17 FAX V.42, V.42bis, MNP2-5

DTMF DIALING CALLER ID HDLC PROTOCOL

HOST FUNCTIONS MULTI-DSP CONTROL, OVERLAY MANAGEMENT

AND DATA TRANSFERS

FRAMER

Figure 1. ADSP-21mod970 Network Access System

SERIAL PORTS

The ADSP-21mod970-110 processor incorporates two complete synchronous, double-buffered serial ports for serial communications. The serial ports interface directly to a time-division multiplexed (TDM) 1544 kbps (T1) or 2048 kbps (E1) serial stream, to an 8K sample/s data stream, or to an 8-bit companded (64 kb/s) data stream (DS0). The serial ports operate under modem software control.

SUPPORTED SYSTEM ARCHITECTURES

The ADSP-21mod970-110 Multiport Internet Gateway Processor supports two system architectures: serial Telco PCM TDM data stream and parallel Telco PCM data stream. The two architectures are differentiated by the method of proving Telco PCM data to the DSP Modem.

Serial Telco PCM TDM Data Stream Architecture

The serial Telco PCM TDM data stream architecture, shown in Figure 2, is the most common architecture. In this architecture, the modem pool may have a local Telco interface that provides a serial TDM data stream of Telco PCM data to the DSP through the DSP’s Serial Port. You can connect up to 24/32 DSPs, through the Serial Port, to a 24-/32-channel serial TDM data stream.

ADSP-21mod970

TELCO PCM

I/F

HOST

MEMORY

I/F

DMA

PORT

SERIAL

PORT

Figure 2. Serial Telco PCM TDM Data Stream Architecture

Parallel Telco PCM Data Stream Architecture

The parallel Telco PCM data stream architecture, shown in Figure 3, provides a single bus interface for all data and control. In this architecture, the modem pool may have a remote Telco interface that provides a parallel data stream of Telco PCM data to the DSP through the DSP’s DMA Port. An arbitrary number of DSPs can be connected, through the DMA Port, to a Host that provides the parallel data stream.

Note: The number of parallel DSPs is limited only by the software loading constraints on the Host.

ADSP-21mod970

TELCO PCM

I/F

HOST

MEMORY

I/F

DMA

PORT

Figure 3. Parallel Telco PCM Data Stream Architecture

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SOFTWARE INTERFACE

Analog Devices provides sample C code for the software interface to the ADSP-21mod970-110. The software interface encompasses the following four areas—download, control interface, data interface and modem statistics.

Download

The DMA Port on the ADSP-21mod970-110 contains an autoincrementing address generator. The host writes the starting address of the transfer and then writes the first word of data. After the first write, the DMA address generator automatically increments; the host writes the next data word and the DMA transfers that word to the next location in ADSP-21mod970110 memory.

The executable image contains code and data that must be loaded into program and data memory. Program memory on the ADSP-21mod970-110 is 24 bits wide, therefore two transfers are used to load each word of program memory.

The host begins the download by asserting the RESET pin of the ADSP-21mod970-110. The host then transfers all code and data. All internal memory can be loaded in 5 ms.

Control Interface

The ADSP-21mod970-110 is controlled through two FIFOs in DSP memory. The host sends a control event by writing to the host-to-modem FIFO. The ADSP-21mod970-110 posts events to the host by writing into the modem-to-host FIFO.

Data Interface

All data transferred to and from the ADSP-21mod970-110 passes through word FIFOs located in internal memory on the ADSP-21mod970-110. The FIFOs are accessed through a control structure that contains a pointer to the start of the FIFO in memory, the length of the FIFO in 16-bit words, a pointer to the next address to be read, and a pointer to the next address to be written. The transmit and receive FIFOs are 1024 bytes deep. Example code providing primitives for accessing the byteFIFOs is available from Analog Devices. Table I shows an example of a data FIFO.

Table I. FIFO Example

INFO

BASE

PD_PTR

WR_PDR

BASE + SIZE

Modem Statistics

Several modem statistics can be gathered through the DMA Port. These statistics include call status, modulation in use, connect rate, transmit and receive data rate, symbol rate, retrain count, rate renegotiation count and others. Table II and Table IV contain a complete listing of available modem statistics.

Modem Configuration

The modem is configured by programming various parameters through the DMA Port. Table III and Table V contain complete lists of modem configuration parameters.

Table II. Shell Status

Reference # Function

SS. 0 Product Number SS. 1 Application Version SS. 2 Application Type SS. 3 Programmable Flag Data

Table III. Shell Parameters

Reference # Function

SP. 0 Serial Port Tx Time Slot SP. 1 Serial Port Rx Time Slot SP. 2 Serial Port Configuration SP. 3 Programmable Flag Control SP. 4 Programmable Flag Data SP. 5 Host Interrupt Count

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Table IV. Modem Status

Reference # Function

MS. 0 Data Modulation State MS. 1 SNR MSE Measure MS. 2 Rx Level dBm MS. 3 Tx Level dBm MS. 4 Tx V.34 Symbol Rate MS. 5 Rx V.34 Symbol Rate MS. 6 Round Trip Delay MS. 7 Telemetry Data Update MS. 8 Constellation X MS. 9 Constellation Y MS. 10 Variable 2 X Pointer MS. 11 Variable 2 Y Pointer MS. 12 Variable 3 X Pointer MS. 13 Variable 3 Y Pointer MS. 14 Variable 4 X Pointer MS. 15 Variable 4 Y Pointer MS. 16 Data Modulation Monitor Retrain Local Count MS. 17 Data Modulation Monitor Retrain Remote Count MS. 18 Data Modulation Monitor Retrain Auto Count MS. 19 Data Modulation Monitor Renegotiate Local

Count

MS. 20 Data Modulation Monitor Renegotiate Remote

Count

MS. 21 Data Modulation Monitor Renegotiate Auto

Count MS. 22 Omc Carrier Family MS. 23 Omc Disconnect Reason MS. 24 Omc State MS. 25 Omc Time MS. 26 Omc Idle Time Start MS. 27 Omc Data Protocol Time Start MS. 28 Omc Initial Rx Data Rate MS. 29 Omc Current Rx Data Rate MS. 30 Omc Initial Tx Data Rate MS. 31 Omc Current Tx Data Rate MS. 32 Data Protocol MS. 33 Data Protocol Compression MS. 34 Data Protocol Rx HDLC Error Frame Count MS. 35 Data Protocol Rx HDLC Frame Count MS. 36 Data Protocol Tx HDLC Frame Count MS. 37 Data Protocol Tx Data Frame Count MS. 38 Data Protocol Tx Data Frame Retransmit Count MS. 39 Data Protocol Rx Data Frame Count MS. 40 Data Protocol Rx Data Frame Missing Count MS. 41 Data Modulation Monitor Retrain Remote

Count MS. 42 Data Protocol Call Tx Data Compressibility

Metric MS. 43 Data Protocol Call Rx Data Compressibility

Metric MS. 44 Data Protocol Call Tx Data Metric MS. 45 Data Protocol Call Rx Data Metric MS. 46 V.PCM Digital Attenuation MS. 47 V.PCM Robbed Bit Mask MS. 48 V.PCM Coding Law

Table V. Modem Parameters

Reference # Function

MP. 0 Omc Data Modulation Originate Enable MP. 1 Dial Billing Delay Duration MP. 2 Omc Data Modulation/Data Protocol

Maximum Start-Up Duration MP. 3 Data Protocol Start Delay MP. 4 Data Protocol Allowed Mask MP. 5 Data Protocol Preferred Mask MP. 6 Data Protocol Auto-Select Mask MP. 7 Data Protocol Compression Mask MP. 8 Data Protocol Cmn Binary Enable MP. 9 Data Protocol Cmn HDLC Enable MP. 10 Data Protocol LAPM to Sync MP. 11 Data Protocol MNP Block Mode Enable MP. 12 Data Protocol MNP Data Compression Select MP. 13 Data Protocol MNP Header Optimize Enable MP. 14 Data Protocol MNP Maximum Data Size MP. 15 Data Protocol MNP Service Class MP. 16 Data Protocol Disconnect Management Mode MP. 17 Data Protocol Disconnect Management

Duration MP. 18 Digital Data Modes MP. 19 Pump Data Modes MP. 20 Pump Tone Transmit Level MP. 21 Pump Transmit Level MP. 22 Pump V.34 Transmit Level MP. 23 Data Modulation Carrier Detect Duration MP. 24 Data Modulation Carrier Loss Disconnect

Timer Duration MP. 25 Data Modulation Line Quality Monitor Mode MP. 26 Data Modulation Options Mask MP. 27 Data Modulation V.32 Rate Enable Mask MP. 28 Data Modulation V.34 Data Rate Mask MP. 29 V.PCM Maximum Power MP. 30 V.PCM Reference Point MP. 31 K56 RBS Maximum MP. 32 K56 Tx Data Rate Maximum MP. 33 K56 Tx Data Rate Minimum MP. 34 DTE Interface Big Endian MP. 35 PPP Rx Mode Enable MP. 36 PPP Tx Mode Enable MP. 37 f

PPP Detect Enable

MP. 38 f

PPP Rx ACCM

MP. 39 fP PPP Tx ACCM

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ORDERING GUIDE

Package

Part Number Description Processor Clock Package Description Option

ADSP-21mod970-110 with 312 MIPS DSP with Modem Unit Software License Software Unit License 26.0 MHz 304 Plastic Ball Grid Array BP-304

Datasheet ADSP-21MOD970 Datasheet (Analog Devices)

Specifications and Main Features

Frequently Asked Questions

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