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TMC2074-NE

Dual Mode CircLink™ Controller

SMSC -> Microchip 

Dual Mode CircLink™ Controller

Datasheet

TABLE OF CONTENTS

Chapter 1 General Description................................................................................................................................6

1.1 About CircLink...................................................................................................................................................6

1.2 About TMC2074 .................................................................................................................................................7

1.3 Internal Block Diagram .....................................................................................................................................8

1.4 Pin Configuration ..............................................................................................................................................9

1.5 Pin Description by Functions.........................................................................................................................13

1.5.1 CPU Interface Pins (27) .................................................................................................................................13

1.5.2 Transceiver Interface Pins (5)........................................................................................................................13

1.5.3 Setup Pins (37) ..............................................................................................................................................14

1.5.4 External Output or I/O Pins (10).....................................................................................................................14

1.5.5 Test Pins (5) ..................................................................................................................................................15

1.5.6 Clock Pins (3) ................................................................................................................................................15

1.6 Setup Pins........................................................................................................................................................16

1.6.1 CPU Type Selection.......................................................................................................................................16

1.6.2 Address Multiplex Selection ...........................................................................................................................17

1.6.3 Write Timing Selection ...................................................................................................................................18

1.6.4 Read Timing Selection...................................................................................................................................19

1.6.5 Data Bus Width Selection ..............................................................................................................................20

1.6.6 Data Bus Byte Swap ......................................................................................................................................20

1.6.7 Data Strobe Polarity Specification..................................................................................................................20

1.6.8 Page Size Selection.......................................................................................................................................21

1.6.9 Maximum Node (MAXID) Number Setup .......................................................................................................21

1.6.10 Node ID Setup............................................................................................................................................21

1.6.11 NST Resolution Setup................................................................................................................................22

1.6.12 Standalone Mode Specification ..................................................................................................................22

1.6.13 Warning Timer Resolution/Standalone Sending Schedule Setup...............................................................22

1.6.14 Diagnosis Mode..........................................................................................................................................22

1.6.15 Prescaler Setup for Communication Speed................................................................................................22

1.6.16 NST Carry Output Digit Select....................................................................................................................23

1.6.17 CMI Bypass Specification...........................................................................................................................23

1.6.18 HUB Function ON/OFF ..............................................................................................................................23

1.6.19 Optical Transceiver Mode ..........................................................................................................................23

1.6.20 TXEN Polarity Select..................................................................................................................................24

1.6.21 Extension Timer Setting 1 ..........................................................................................................................24

1.6.22 Test Pins ....................................................................................................................................................24

Chapter 2 Functional Description.........................................................................................................................25

2.1 Communication Specification ........................................................................................................................25

2.2 Message Class.................................................................................................................................................25

2.3 CircLink Network Communication Protocol Overview ................................................................................26

2.4 CircLink Protocol Enhancement ....................................................................................................................27

2.4.1 Reducing Token Loss ....................................................................................................................................27

2.4.2 Reduction of Network Reconfiguration Time..................................................................................................27

2.4.3 Reduction of Reconfiguration Burst Signal Send Time ..................................................................................28

2.5 RAM Page Expansion......................................................................................................................................28

2.5.1 RAM Access ..................................................................................................................................................29

2.5.2 Packet Buffer Structure..................................................................................................................................31

2.5.3 Packet Data Structure....................................................................................................................................32

2.6 CPU Interface...................................................................................................................................................33

2.6.1 CPU Identification and Compatibility between Intel and Motorola Processors ...............................................33

SMSC TMC2074

Page 3

DATASHEET

Revision 0.1 (03-29-06)

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