COM20051 查看數據表（PDF） - SMSC -> Microchip

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COM20051

Integrated Microcontroller and Network Interface with Watchdog Timer and A/D Converter Interface

SMSC -> Microchip 

ITT to #1

#1 fbe to #5

#5 ack to #1

#1 tx's data

#5 ack to #1

#3 ITT to #4

#4 NACK to #3

#3 FBE to #4

#2 ITT to #3

#1 ITT to #2

#4 ITT to #5

SEQUENCE OF LINE EVENTS

1) NODE 1 RECEIVES TOKEN FROM NODE 5

2) NODE 1 TRANSMITS TO NODE 5

A) ISSUES FBE TO NODE 5

B) NODE 5 IS READY TO RECEIVE SO IT ISSUES AN ACK

C) NODE 1 NOW TRANSMITS THE DATA

D) NODE 5 RECEIVES THE DATA ERROR FREE AND ISSUES AN ACK

3) NODE 1 PASSES TOKEN TO NODE 2

4) NODE 2 DOES NOT NEED TO TRANSMIT AND PASSES THE TOKEN TO NODE 3

5) NODE 3 NEEDS TO TRANSMIT TO NODE 4

A) ISSUES AN FBE TO NODE 4

B) NODE 4 IS NOT READY TO RECEIVE AND IT ISSUES A NACK

6) NODE 3 PASSES THE TOKEN TO NODE 4

7) NODE 4 PASSES THE TOKEN TO NODE 5

8) GO TO STEP 1

FIGURE 6 - AVERAGE SEQUENCE OF LINE EVENTS FOR A FIVE-NODE NETWORK

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