PI7C21P100NH PERICOM [Pericom Semiconductor Corporation], PI7C21P100NH Datasheet - Page 56

• Manufacturer Part Number: PI7C21P100NH
• Description: 2-PORT PCI-X BRIDGE
• Manufacturer: PERICOM [Pericom Semiconductor Corporation]

8.1.43
8.1.44
PRIMARY RETRY COUNTER REGISTER – OFFSET 60h
The below settings are the only allowed values. Other settings are not valid and will result in
smaller retry counts. When the counter expires, the bridge discards the requested transaction
on the primary bus and issues SERR# on the primary bus if enabled.
0000 0000: No expiration limit
8000 0000: Allow 2G retries before expiration
0100 0000: Allow 16M retries before expiration
0001 0000: Allow 64K retries before expiration
0000 0100: Allow 256 retries before expiration
SECONDARY RETRY COUNTER REGISTER – OFFSET 64h
The below settings are the only allowed values. Other settings are not valid and will result in
smaller retry counts. When the counter expires, the bridge discards the requested transaction
on the secondary bus and issues SERR# on the primary bus if enabled.
0000 0000: No expiration limit
8000 0000: Allow 2G retries before expiration
0100 0000: Allow 16M retries before expiration
0001 0000: Allow 64K retries before expiration
0000 0100: Allow 256 retries before expiration
BIT
31
30:25
24
23:17
16
15:9
8
7:0
BIT
31
30:25
24
23:17
16
15:9
8
7:0
FUNCTION
2G Retry Count Control
RESERVED
16M Retry Count
Control
RESERVED
64K Retry Count
Control
RESERVED
256 Retry Count
Control
RESERVED
FUNCTION
2G Retry Count Control
RESERVED
16M Retry Count
Control
RESERVED
64K Retry Count
Control
RESERVED
256 Retry Count
Control
RESERVED
TYPE
RO
RO
TYPE
RO
RO
RW
RW
RW
RO
RW
RO
RW
RW
RW
RO
RW
RO
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DESCRIPTION
2G Retry Count Control
1: Designates 2G retries before expiration
Reset to 0
Reserved. Returns 000000 when read.
16M Retry Count Control
1: Designates 16M retries before expiration.
Reset to 0
Reserved. Returns 0000000 when read.
64K Retry Count Control
1: Designates 64K retries before expiration.
Reset to 0
Reserved. Returns 0000000 when read.
256 Retry Count Control
1: Designates 256 retries before expiration.
Reset to 0
Reserved. Returns 00000000 when read.
DESCRIPTION
2G Retry Count Control
1: Designates 2G retries before expiration
Reset to 0
Reserved. Returns 000000 when read.
16M Retry Count Control
1: Designates 16M retries before expiration.
Reset to 0
Reserved. Returns 0000000 when read.
64K Retry Count Control
1: Designates 64K retries before expiration.
Reset to 0
Reserved. Returns 0000000 when read.
256 Retry Count Control
1: Designates 256 retries before expiration.
Reset to 0
Reserved. Returns 00000000 when read.
ADVANCE INFORMATION
June 10, 2005 Revision 1.06
2-PORT PCI-X BRIDGE
PI7C21P100