SMSC TMC20073

PRODUCT PREVIEW

Revision 1.3 (02-11-04)

Data Brief

Product Features

TMC20073

CircLink

Communications

Controller LSI

3.3V (3.0 to 3.6V) Power Supply Voltage (Vdd)

128 Pin TQFP Package (14x14, 0.4 pitch)

Supports 8/16-Bit Data Bus (Selectable)

Full 1K On-Chip Dual-Port Buffer RAM

Supports Sequential I/O Mapped Access to Internal

RAM Buffer

Supports up to 31 Nodes

Low Power CMOS, 3.3V Operation with 5V Tolerance

Cabling Options

-- Fiber Optics, RS485 Twisted Pair

High Speed: Up to 5 Mbps

Include 3 Port HUB

Can operate with or without CPU

-- With CPU: Support interface to multiple CPU's

Intel (80XX) and Motorola (68XXX)

-- Without CPU: Support general purpose I/O ports

16 bit input and 16 bit output

Support multi-topology

-- Bus, Star and Mixed type

Temperature Range from -20

to 85

Figure 1 Internal Block Diagram of LSI

Mode Setting

Control Circuit

Interrupt Status

Interrupt Mask

EC Command

Receive Mode(#01-#31)

Receive Flag(#01-#31)

Clock Master SID

Net. Standard Time

Alarm Setting

Receive SID

Search SID

MAX ID Setting (MAXID)

Node ID Setting (NID)

Page Size Setting (PS)

Data Rate Setting

Address pointer

Page Register

Address Register

Diag. Register

Data Register H

Data Register L

Data Latch

TENT-ID Register

CONFIG Register

SETUP Registers

Address

Multiplexer

Address Pointer

Data Latch

Shift Register

RX Synchro-

nous circuit

TX Signal
Generator

CMI Decode

CMI Encode

CMI Synchro

TXEN TXD

RXIN

Buffer Memory

512B 512B

Improved ARCNET Protocol

Micro Sequencer

Working Registers

Memory Access Mediation Circuit

RECON Timer

OSC

Reset Circuit

Micro-Controller bus

MAXID

NID

CKP

nMUX nRWM W16 nSWAP

nSTALONE

nDIAG

FLASHO

nNSTCOUT

TXEN2

RXIN2

3Port HUB Circuit

ERR-INFO

PIN-INFO

nHUBON nCMIBYP

Others

Clock

ORDERING INFORMATION

Order Number(s):

TMC20073-NT for 128 pin TQFP package (Lead-Free)

80 Arkay Drive

Hauppauge, NY 11788

(631)

435-6000

FAX (631) 273-3123

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
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known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request.
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Revision 1.3 (02-11-04)

SMSC TMC20073

PRODUCT PREVIEW

SMSC TMC20073

Revision 1.3 (02-11-04)

PRODUCT PREVIEW

General Description

The CircLink

TMC20073 controller is an LSI device developed for DATA COMMUNICATION control

using a modified ARCNET base token passing protocol guaranteeing message integrity and maximum
delivery times which can be calculated.

In an ARCNET based network when a node receives the token it becomes the temporary master of the
network, this time frame is however, of short duration. The length of messages are limited and therefore,
no one node can dominate the network since it must relinquish control of the token. Once a message
has been sent the token is sent to the next logical node allowing it to be come the master.

By using this token passing scheme for mediating access of the network by any one node, the time
performance of the network becomes predictable or DETERMINISTIC.

Industrial network applications require predictable performance to ensure that controlled events occur
when required. The TMC20073 CircLink controller with it's token passing protocol is therefore the ideal
solution for real time control systems.

The TMC20073 incorporates 1 kilobyte of buffer RAM which is portioned from 4 to a maximum of 32
pages. In a network which has up to 31

nodes, the data being sent by the controlling node is also

received by all other nodes of the network and stored according to node source ID. For the target node
the received data is executed per the ARCNET flow control and the data is stored in it's buffer RAM.
Thus the receiving node acts on the data while the remaining nodes on the network discard the data
once the receiving node has executed the instruction. This redundancy assures higher reliability.

Reconfiguration of a CircLink network becomes necessary when the token is destroyed. Accordingly,
the maximum wait time for sending end will not be guaranteed during this moment and the feature of
real-time processing is impaired. To cope with the disability of real-time feature, the ARCNET protocol
is modified to avoid token missing as much as possible and reduce the network reconfiguration time in
token missing.

CircLink also uses CMI code for transmitting signals, rather than the dipulse or bipolar signals which are
the standard ARCNET signals. Since the CMI signal eliminates the DC element, a simple combination
of a standard RS485 IC and a pulse transformer can be used to implement a transformer coupled
network.

Document Outline

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: TMC20073

Document Outline

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: TMC20073