February, 2007
PCI Express Capability Registers
Register 11-25. 70h Device Status and Control (All Ports)
Serial
EEPROM
Bit(s)
Description
Device Control
Type
Default
Correctable Error Reporting Enable
0 = Disables
1 = Enables corresponding PEX 8532 port to report Correctable errors
0
1
2
3
4
RW
RW
RW
RW
RO
Yes
Yes
Yes
Yes
No
0
0
0
0
0
Non-Fatal Error Enable
0 = Disables
1 = Enables corresponding PEX 8532 port to report Non-Fatal errors
Fatal Error Reporting Enable
0 = Disables
1 = Enables corresponding PEX 8532 port to report Fatal errors
Unsupported Request Reporting Enable
0 = Disables
1 = Enables corresponding PEX 8532 port to report Unsupported Request errors
PCI Express Relaxed Ordering Enable
Not supported
Cleared to 0.
Maximum Payload Size
Software can change this field to configure the PEX 8532 ports to support other
Payload sizes; however, software cannot change this field to a value larger than
that indicated by the Device Capabilities register Maximum Payload Size Supported
field (offset 6Ch[2:0]).
7:5
RW
Yes
000b
000b = Indicates that initially the PEX 8532 port is configured to support
a Maximum Payload Size of 128 bytes
001b = Indicates that initially the PEX 8532 port is configured to support
a Maximum Payload Size of 256 bytes
No other values are supported.
Extended Tag Field Enable
Not supported
Cleared to 0.
8
9
RO
RO
RO
RO
RO
No
No
No
No
No
0
0
0
0
Phantom Functions Enable
Not supported
Cleared to 0.
Auxiliary (AUX) Power PM Enable
Not supported
Cleared to 0.
10
11
No Snoop Enable
Not supported
Cleared to 0.
Maximum Read Request Size
Not supported
Cleared to 000b.
14:12
15
000b
0
Reserved
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
177
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