参数资料
型号: IBM21P100BGB
元件分类: 总线控制器
英文描述: PCI BUS CONTROLLER, PBGA304
封装: 31 X 31 MM, HEAT SINK, PLASTIC, BGA-304
文件页数: 113/140页
文件大小: 2032K
代理商: IBM21P100BGB
IBM21P100BGB
IBM 133 PCI-X Bridge R1.1
Configuration Registers
Page 66 of 131
ppb11_pcix_regs.fm.03
July 9, 2001
5.2.5.8 Primary Retry Counter Register
The Primary Retry Counter register defines the number of retries that the bridge receives on the secondary
bus for a requested transaction, before its internal retry counter expires. When the counter expires, the bridge
discards the request, and, if enabled, will issue SERR# on the primary bus.
This mechanism prevents deadlock when the target is unable to receive the request, and allows recovery
through the use of SERR#.
The only allowed values are:
x‘0000 0000’: Counting disabled (No expiration)
x‘0000 0100’: 256 retries before expiration
x‘0001 0000’: 64K retries before expiration
x‘0100 0000’: 16M retries before expiration
x‘8000 0000’: 2G retries before expiration
Address Offset
x‘60’
Access
Read/Write
Reset Value
x‘0000 0000’
Restrictions
Only one bit can be set at any given time; setting multiple bits results in the smaller
retry count.
2G
re
tr
ies
Reserved
16M
ret
ri
e
s
Reserved
6
4
K
ret
ri
es
Reserved
2
5
6
ret
ries
Reserved
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Bit(s)
Access
Field Name and Description
31
RW
This bit used to indicate 2G retries before expiration.
30:25
RO
Reserved.
24
RW
This bit used to indicate 16M retries before expiration.
23:17
RO
Reserved.
16
RW
This bit used to indicate 64K retries before expiration.
15:9
RO
Reserved.
8
RW
This bit used to indicate 256 retries before expiration.
7:0
RO
Reserved.
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