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Bitfields for AMD-640 CPU-to-PCI Flow Control 2 register

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Bit Description

7

 unsuccessful retry (16 or 64 times) has occurred (write-clear)

6

 retry timeout action
0 = retry continuously, recording status
1 = flush buffer; if reading, return FFFFFFFFh

5 - 4

 retry count and backoff
00 = retry twice, backoff processor
01 = retry 16 times, set bit 7 on failure
10 = retry four times, backoff processor
11 = retry 64 times, set bit 7 on failure

3

 discard failed data from write buffer when retry fails

2

 backoff processor if PCI read retry fails

1

 assert FRAME# one cycle earlier than indicated by offset 71h bit 1

0

 reduce TRDY#-to-BRDY# by one HCLK on processor reads of PCI target

See Also:

#00983,#01005,#01007