TSB14C01AI datasheet(26/31 Pages) TI

26 / 31 page

TSB14C01A, TSB14C01AI, TSB14C01AM

5-V IEEE 1394-1995 BACKPLANE TRANSCEIVER/ARBITER

SGLS107A – FEBRUARY 1999 – REVISED NOVEMBER 1999

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

urgent arbitration (continued)

arb Node B

Fairness

Interval (N –1)

Fairness

Interval (N +1)

arb Node B

Arbitration

Reset Gap

Arbitration

Reset Gap

Node A

Arbitration_Enable

Node B

Urgent_Count

arb Node A

arb Node B

arb

Node B

arb Node C

arb

arb Node B

arb

Node B

arb Node B

Urgent

Packet

Urgent

Packet

Urgent

Packet

Fair

Packet

Urgent

Packet

Urgent

Packet

Urgent

Packet

Fair

Packet

Urgent

Packet

Urgent

Packet

Urgent

Packet

Fairness Interval (N)

A Node Using The Urgent

Protocol Has a Higher Priority

Than Any Fair Node

Fairness Interval (N)

Urgent_Count Incremented By

3 After A Fair Node (A) Wins

Arbitration and Sends A Packet

Urgent_Count Set

To 3 At Arbitration

Reset Gap

Arbitration_Enable Set At

Arbitration Reset Gap

Arbitration_Enable Set At

Arbitration Reset Gap

Urgent_Count Decremented

When Urgent Node Sends A Packet

Urgent_Count Incremented By 3

After A Fair Node (C) Wins Arbitration

and Sends A Packet

Node A

Node B

Node C

Arbitration_Enable

Node B

Arbitration_Enable Set

at Arbitration Reset Gap

Figure 13. Urgent Arbitration

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