February, 2007
PCI Express Capability Registers
Register 11-24. 6Ch Device Capabilities (All Ports)
Serial
EEPROM
Bit(s)
Description
Ports
Type
Default
Maximum Payload Size Supported
000b = PEX 8532 ports support 128-byte maximum payload
001b = PEX 8532 ports support 256-byte maximum payload
No other values are supported.
2:0
RO
Yes
001b
Note: Serial EEPROM must not load greater than 256 bytes Maximum
Payload Size.
Phantom Functions Supported
Not supported
Cleared to 00b.
4:3
5
RO
RO
Yes
Yes
00b
0
Extended Tag Field Supported
0 = Maximum Tag field is 5 bits
1 = Maximum Tag field is 8 bits
Endpoint L0s Acceptable Latency
Not supported
8:6
RO
RO
Yes
Yes
000b
000b
Because the PEX 8532 is a switch and not an endpoint, it does not support
this feature.
000b = Disables the capability
Endpoint L1 Acceptable Latency
Not supported
11:9
Because the PEX 8532 is a switch and not an endpoint, it does not support
this feature.
000b = Disables the capability
ExpressLane PEX 8532AA/BA/BB/BC 8-Port/32-Lane Versatile PCI Express Switch Data Book
Copyright © 2007 by PLX Technology, Inc. All Rights Reserved – Version 1.6
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