SMSC TMC2005-JT User Manual

TMC2005-JT

ARCNET 5 Port HUB Controller

FEATURES

 ARCNET HUB Circuit for ARCNET Protocol

(Data Rate From 156.25Kbps to 10Mbps)

 Able to Connect Various Transceivers Directly
 Device Includes TX/RX Timing Circuit for 5 Port

Hub and Direction Control Circuit, Jitter Correct
Circuit and Noise Cancel Circuit

 Easy to Design 8 or 12 Port Hub

GENERAL DESCRIPTION

When configuring a network, the maximum number of nodes and the maximum cable length are limited by the electric
capacity of the transceiver. In this case, the network is expanded by an equipment called a “HUB” or “repeater”. It
maybe necessary to have a converter between coax, T/P and the fiber cable. It is easy to design a HUB or a repeater
because the TMC2005 has various features for expanding such network.

It can connect with HYC9088, RS485 transceiver, HYC5000/4000/2000 and TTL interface for optical module. It can
connect with three different transceivers at the same time and convert the media of each. (The data rate cannot be
converted. It is necessary to operate all nodes in the same network at the same data rate). The Hubs can be
expanded by connecting two or more TMC2005 chips. By setting one of 5 ports to open-drain output, the Hub can be
expanded to either 12 or 16 ports.

ORDERING INFORMATION

Order Number(s):

TMC2005-JT for 64 pin, TQFP Lead-Free RoHS Compliant Package

 Can Connect with HYC9088 in Normal Mode
 Can Connect with RS485 Transceiver,

HYC5000/4000/2000, Opt Module and TTL
Interface in Backplane Mode

 Supports both Normal and Backplane Mode at

the Same Time for Media Conversion

 + 5V Single Power

SMSC TMC2005-JT Revision 1.1 (07-24-07)

DATASHEET

ARCNET 5 Port HUB Controller

Datasheet

80 ARKAY DRIVE, HAUPPAUGE, NY 11788 [phone], FAX [phone]

Copyright © 2007 SMSC or its subsidiaries. All rights reserved.

Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete
information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no
responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without
notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information
does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of
SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's
standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or
errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon
request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure
could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC
and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms
of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems
Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.

SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND
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DAMAGES.

Revision 1.1 (07-24-07) Page 2 SMSC TMC2005-JT

DATASHEET

ARCNET 5 Port HUB Controller

Datasheet

TABLE OF CONTENTS

FEATURES..................................................................................................................................................................1

GENERAL DESCRIPTION.......................................................................................................................................1

PIN CONFIGURATION ............................................................................................................................................4

BLOCK DIAGRAM....................................................................................................................................................4

BLOCK DIAGRAM....................................................................................................................................................5

DESCRIPTION OF PIN FUNCTIONS ....................................................................................................................5

DESCRIPTION OF PIN FUNCTIONS ....................................................................................................................6

TX/RX INTERFACE....................................................................................................................................................7

OPERATING MODE SETUP..........................................................................................................................................8

PLL...........................................................................................................................................................................8

OTHER SIGNALS ........................................................................................................................................................9

OPERATIONAL DESCRIPTION...........................................................................................................................10

DIRECTION DETERMINATION...................................................................................................................................10

DIRECTION RELEASE ...............................................................................................................................................10

JITTER FILTER..........................................................................................................................................................10

OPTION FEATURE FOR JITTER FILTERING.................................................................................................................11

OPTION FEATURE FOR NOISE CUT MODE .................................................................................................................11

APPLICATION NOTES ........................................................................................................................................12

PORT GROUP...........................................................................................................................................................20

VARIOUS SETUP.......................................................................................................................................................20

EXAMPLE FOR OPERATION MODE SETUP TO EACH PORT........................................................................................20

NOTE FOR UNUSED PORT .........................................................................................................................................20

EXAMPLE FOR POWER-ON RESET CIRCUIT..............................................................................................................20

CONNECTING THE TMC2005 WITH INTERNAL PLL...................................................................................21

METHOD TO CONNECT A CRYSTAL CLOCK.............................................................................................................22

NPLLTST PIN..........................................................................................................................................................22

CASCADING CONNECTION ................................................................................................................................23

RING NETWORK WITH THE TMC2005.....................................................................................................................26

MAXIMUM GUARANTEED RATINGS*............................................................................................................27

STANDARD OPERATING CONDITION............................................................................................................27

DC CHARACTERISTIC - INPUT PIN..................................................................................................................27

DC CHARACTERISTIC - OUTPUT PIN..............................................................................................................28

AC CHARACTERISTIC - CLOCK AND RESET...................................................................................................28

AC CHARACTERISTIC – RX WAVEFORMS AND TX WAVEFORMS ........................................................................29

TMC2005-JT 64 PIN TQFP PACKAGE OUTLINE.............................................................................................31

SMSC TMC2005-JT Page 3 Revision 1.1 (07-24-07)

DATASHEET

ARCNET 5 Port HUB Controller

Datasheet

MB

PIN CONFIGURATION

VSS8

RXINB0

SB

TXENB0

LB

RXINB1

NC

RXINA0

SA

TXENA0

LA

MA

RXINA1

TXENA1

VDD6

TXENB1

HM

SE

NC

LE

EXTRX

ME

VSS1

EXTTX

VDD1

CKO

VSS2

CKM2
CKM1
CKM0

NC

64 63 62 495051525354555657585960

1
2

3
4
5
6
7
8
9

10
11
12
13

14
15

16

17 18 19 20 21

RXFLT

nPLLTST

61

TMC2005-JT

22 23 24 25 26 27 28 29 30

LP

R0

VDD3

AVDD

XTLO

VSS4

NC

VDD4

XTLI

VDD2

AGS

AVSS

31

VSS3

32

48
47
46
45
44
43

42
41
40
39
38
37
36
35
34
33

VSS5

VSS7
nPULSE1

nPULSE2
nP1BAK
VDD5
nCKOEN
nRST
VSS6
nBJA
nBJB
nBJE
nMBA
nMBB
nMBE
nEXTOD
NC

Revision 1.1 (07-24-07) Page 4 SMSC TMC2005-JT

DATASHEET

ARCNET 5 Port HUB Controller

Datasheet

BLOCK DIAGRAM

RXINA 0

RXINA 1

RXINB 0
RXINB 1

EXTRX

HM

RXFL T

SE SB SA

NOT

Circuit

NOT

Circuit

NOT

Circuit

nBJ B

nBJ E

nBJ A

Direction Control

Circuit

nMBE

nMBAMEMB

nMBB

MA L ELBLA nEXTOD

OR

Circuit

OR

Circuit

OR

Circuit

Rx

Buffer

NOT

Circuit

NOT

Circuit

NOT

Circuit

Output
Control
Circuit

Tx

Pulse

Gen.

TXENA0
TXENA1

TXENB0
TXENB1

EXTTX

nP1BAK
nPULSE1
nPULSE2

DPLL

Clock Multiplier

CKM0

CKM1

PLL

CKM2

nPLLTST

AVSS

AND

Circuit

nCKOENRO

LP

XTLO

XTLI
AVDD
AVSS

nRST

SMSC TMC2005-JT Page 5 Revision 1.1 (07-24-07)

VSS1- 8

VDD1- 6

CKO

DATASHEET

ARCNET 5 Port HUB Controller

Datasheet

DESCRIPTION OF PIN FUNCTIONS

PIN NO. NAME INPUT/OUTPUT DESCRIPTION NOTE

1 TXENB1 OUTPUT Port B-1 Tx output to media transceiver

Setting for traffic release time (It should

2 HM INPUT

3 SE INPUT

4 NC Reserved. It should be open.

5 LE INPUT

6 EXTRX INPUT

7 ME INPUT

8 VSS1 Ground

9 EXTTX OUTPUT Port EXT. Output to media transceiver.

10 VDD1 Power Supply
11 CKO OUTPUT Clock Output
12 VSS2 Ground
13 CKM2 INPUT Network speed (data rate) setting. Pull-up
14 CKM1 INPUT Pull-up
15 CKM0 INPUT Pull-up
16 NC Reserved. It should be open.
17 RXFLT INPUT Test Pin. It should be open. Pull-up

18 nPLLTST INPUT
19 VDD2 Power Supply
20 XTLI INPUT X'tal input/External clock input.
21 XTLO OUTPUT X'tal output
22 VSS4 Ground
23 NC Reserved. It should be open.
24 VDD4 Power Supply
25 VDD3 Power Supply
26 AVDD Analog Power Supply
27 RO OUTPUT VCO output for internal PLL.

28 LP OUTPUT
29 AGS INPUT Analog sense pin for internal PLL.
30 AVSS Analog Ground
31 VSS3 Ground
32 VSS5 Ground
33 NC Reserved. It should be open.

34 nEXTOD INPUT
35 nMBE INPUT Port EXT. Noise cut (0:on, 1:off) Pull-up
36 nMBB INPUT Port A0/A1 Noise cut (0:on, 1:off) Pull-up
37 nMBA INPUT Port B0/B1 Noise cut (0:on, 1:off) Pull-up

38 nBJE INPUT

39 nBJB INPUT

40 nBJA INPUT
41 VSS6 Ground
42 nRST INPUT Internal reset signal (active Low) Pull-up
43 nCKOEN INPUT Enable of CKO output. Pull-up

be open for normal operation.) Pull-up
Port EXT. Polar assignment for EXTRX
input (0:active Hi, 1:active Low) Pull-up

Port EXT. Polar assignment of EXTTX
output (0:active Low, 1:active Hi) Pull-up
Port EXT. RX-Data input from media
transceiver. Pull-up
Port EXT. Output mode assignment of
EXTTX (0:pulse output, 1:Tx control
output) Pull-up

Test Pin for PLL.. It should connected to
VDD (Set to high)

Connection pin to loop filter for internal
PLL.

Port EXT. Open-drain mode (0:open­drain output, 1:normal output) Pull-up

Port EXT. Jitters correct mode (0:big
jitters mode, 1:normal mode) Pull-up
Port A0/A1 Jitters correct mode (0:big
jitter mode, 1:normal mode) Pull-up
Port B0/B1 Jitter correct mode (0:big
jitter mode, 1:normal mode) Pull-up

Revision 1.1 (07-24-07) Page 6 SMSC TMC2005-JT

DATASHEET

ARCNET 5 Port HUB Controller

Datasheet

PIN NO. NAME INPUT/OUTPUT DESCRIPTION NOTE

44 VDD5 Power Supply.
45 nP1BAK OUTPUT nPULSE1 output (for backplane mode).
46 nPULSE2 OUTPUT nPULSE2 output (for normal mode).
47 nPULSE1 OUTPUT nPULSE1 output (for normal mode)
48 VSS7 Ground

49 RXINA0 INPUT

50 SA INPUT
51 TXENA0 OUTPUT Port A-0 Tx output to media transceiver.

52 LA INPUT

53 RXINA1 INPUT

54 MA INPUT
55 TXENA1 OUTPUT Port A-1 Tx output to media transceiver.
56 VDD6 Power Supply
57 NC Reserved. It should be open.
58 VSS8 Ground

59 RXINB0 INPUT

60 SB INPUT
61 TXENB0 OUTPUT Port B-0 Tx output to media transceiver.

62 LB INPUT

63 RXINB1 INPUT

64 MB INPUT

Port A-0 Rx-data input from media
transceiver. Pull-up
Port A. Polar assignment for RXINA0/A1
output (0:active Hi, 1:active Low) Pull-up

Port A. Polar assignment for TXENA0/A1
output (0:active Low, 1:active Hi) Pull-up
Port A-1 Rx-data input from media
transceiver. Pull-up
Port A. Mode assignment for
TXENA0/A1 (0:pulse output, 1:Tx control
output) Pull-up

Port B-0 Rx-data input from media
transceiver. Pull-up
Port B. Polar assignment for RXINA0/A1
input (0:active Hi, 1:Active Low) Pull-up

Port B. Polar assignment for TXENA0/A1
output (0:active Low, 1:active Hi) Pull-up
Port B-1 Rx-data input from media
transceiver. Pull-up
Port B. Mode assignment for
TXENA0/A1 (0:pulse output, 1:TX control
output) Pull-up

Note: Pull-up: Input with a pull-up resistor 70KΩ ± 30%

TX/RX Interface

FEATURE NAME INPUT/OUTPUT DESCRIPTION

RX Port RXINA [0:1]

RXINB [0:1]

EXTRX

RX Port Polar

Assignment

TX Port TX Control TXENA [0:1]

TX Port TX Data

Output

TX Port nP1BAK OUTPUT TX pulse data into RS485 driver

SMSC TMC2005-JT Page 7 Revision 1.1 (07-24-07)

SA, SB, SE INPUT Setup the polarity of RXINA [0:1],

TXENB [0:1]
EXTTX

nPULSE [1:2] OUTPUT TX pulse data into HYC9068S-

INPUT Setup the polarity by SA, SB, SE.

RXINB [0:1], EXTTX.
0 : active H
1: active L

OUTPUT TX data pulse (Mx=0) or TX

enable signal (Mx=1).
Setup TX mode by MA, MB, ME.
Setup the polarity by LA, LB, LE

SK/9088S-SK when ARCNET
chip is at normal mode.
The pulse is always active Low.

or HYC2485S/2488S when
ARCNET chip is at backplane

DATASHEET

ARCNET 5 Port HUB Controller

Datasheet

FEATURE NAME INPUT/OUTPUT DESCRIPTION

mode.
The pulse is always active Low.

TX Port Polarity

Setup

TX Port Mode Setup MA, MB, ME INPUT Setup the mode of TXENA [0:1],

Operating Mode Setup

FEATURE NAME

Data rate

CKM [0:2] INPUT

setup

Noise cut
mode

nMBA
nMBB
nMBE

Big jitter
mode

nBJA
nBJB
nBJE

Open drain

nEXTOD INPUT Setup a the use of EXTTX port.

mode

PLL

FEATURE NAME

LP OUTPUT

RO OUTPUT VCO output

AGS INPUT Analog sense input.

Revision 1.1 (07-24-07) Page 8 SMSC TMC2005-JT

LA, LB, LE INPUT Setup the polarity of TXENA

[0:1], TXENB [0:1], EXTTX.
0 : active L
1: active H

TXENB [0:1], EXTTX.
0: Output TX pulse. (It is
equivalent to nTXEN “OR”
nP1BAK)
1: Output TX enable

INPUT/

OUTPUT

DESCRIPTION

Terminal to setup the data rate of TMC2005.

CKM2 CKM1 CKM0 DIVISOR MULTIPLIER SPEED
0 0 0 16 x1 156.25 Kbps
0 0 1 8 x1 312.5 Kbps
0 1 0 4 x1 625 Kbps
0 1 1 2 x1 1.25 Mbps
1 0 0 1 x1 2.5 Mbps
1 0 1 1 x2 5 Mbps
1 1 0 Reserved Reserved Reserved
1 1 1 1 x4 10 Mbps

External clock is 20MHz.
Refer to “VARIOUS SETUP”

INPUT 0: Cut off noise from received data

1: Don’t cut off noise

Setup “0” normally.

INPUT Setup a jitter filter feature.

Select a pulse as reference phase used by DPLL.

nd

0: 2

pulse (big jitter mode)

st

1: 1

pulse (normal mode)

INPUT/

OUTPUT

0: Set EXTTX as open drain output and use as Ext.
1: Set EXTTX as normal output and use as 5

DESCRIPTION

th

port.

Using PLL: Connect to an external condenser
“C1” for loop filter.

Using no PLL: must be open.

Using PLL: Connect to an external resistor “R0” for
loop filter.
Using no PLL: must be open.

Using PLL: Connect to loop filter.
Using no PLL: Connect to ground.

DATASHEET

ARCNET 5 Port HUB Controller

Datasheet

FEATURE NAME

nPLLTST INPUT Test pin for PLL.

AVDD Analog power supply

AVSS Analog ground

INPUT/

OUTPUT

DESCRIPTION

Must always connect to VDD.

Using PLL: Analog power supply. There are some
limits on PCB pattern.
Using no PLL: Power supply (+5V) same as VDD1~6.

Using PLL: Analog ground. There are some limits on
PCB pattern.
Using no PLL: Use a ground same as VSS1~8.

Other Signals

FEATURES

CRYSTAL
INTERFACE

CRYSTAL
INTERFACE

SYSTEM RESET
INTERFACE
TEST PIN CKO OUTPUT Output internal clock of TMC2005.
TEST PIN nCKOEN INPUT Output control of CKO.

TEST PIN RXFLT INPUT It must be open
TEST PIN NC [1:2] It must be open
POWER SUPPLY VDD [1:6] Power supply (+5V)
GROUND VSS [1:8] Ground

NAME

XTLI INPUT Connect a 20MHz crystal.

XTLO OUTPUT Connect a 20MHz crystal.

nRST INPUT Reset for initializing TMC2005. (active

INPUT/

OUTPUT

DESCRIPTION

When supplying an external clock,
input the clock to this pin.

When supplying an external clock, it
must be open.

Low)

0: Output internal clock on CKO.
1: Always output Low level on CKO.
Set “1” Normally.

SMSC TMC2005-JT Page 9 Revision 1.1 (07-24-07)

DATASHEET

ARCNET 5 Port HUB Controller

Datasheet

OPERATIONAL DESCRIPTION

Direction Determination

All TX ports are set to disable mode in the initial state. When a signal is received from any RX ports, the circuit holds
the port on receiving mode (disable TX) and changes the other ports to sending mode (disable RX). One port stays in
RX and the rest change into TX after all. The circuit initializes the internal DPLL on the timing of received RX pulse,
and the RX buffer circuit stores the RX data and filters its jitter. TX controlling circuit regenerates the stored RX pulse
on nPULSE1, nPULSE2 and nP1BAK. The nPULSE1 and nPULSE2 are pulse output pins for transceivers
(HYC9088A) of ARCNET normal mode. The nP1BAK is a pulse output pin for transceiver (HYC5000/4000/2000 and
RS485 driver) of ARCNET back plane mode. When using optical transceiver, instead of these signals, TXENA [0:1],
TXENB [0:1], EXTTX (MA, MB, ME = 0) must be used as TX data inputs of the optical transceiver.

Direction Release

On ARCNET protocol, each TX message starts with 6-bits of “1” ALERT and each data byte is lead by three bits (1, 1,

0) preamble. To control the HUBs direction, the circuit monitors this bit pattern and holds the state. If the end of the bit
pattern comes, all TX ports return receiving mode (disable TX) again. The interval timer detects the end of the bit
pattern. During data is on line, silent period is less than 4 uS* because at least one bit “1” among 10-bits is received
while receiving the data. The minimum silent interval from the end of received data to the alert of the next data (the
minimum time of changing the direction) is the chip turn around time (12.6 uS*) of ARCNET controller. The interval
timer to detect the data end is set to 5.6uS by adding some margin to the above interval for neglecting the reflection
on a cable.
[Note] Numbers marked * are at 2.5Mbps operation.

Jitter Filter

To build a network with transceivers that introduce big jitter like ones for optical fiber, the old HUB that has direction
control only may cause a transmission error because jitters on each HUB are added when several HUBs were
connected in serial. The TMC2005 fixes that problem with jitter filtering and wave shaping through the following three
steps.

1) Input Sampling

The TMC2005 samples a data on a network by eight times clock of the network data.

2) Jitter Filtering (DPLL)

The TMC2005 filters the jitter (± 100nS at 2.5Mbps) of network data sampled by 8X clock through the internal digital
PLL and stores the data into the buffer.

3) Wave Shaping Output

The TMC2005 re-synchronizes and regenerates the network data at the same clock as the data rate.

The capability of the jitter filtering is shown below.

DATA RATE CAPABILITY OF JITTER FILTERING

10Mbps ± 25nS

5Mbps ± 50nS

2.5Mbps ± 100nS

1.25Mbps ± 200nS
625Kbps ± 400nS

312.5Kbps ± 800nS

156.25Kbps ± 1.6uS

Revision 1.1 (07-24-07) Page 10 SMSC TMC2005-JT

DATASHEET