PEX 8532 Transparent Mode Port Registers
PLX Technology, Inc.
Register 11-181. A04h, A1Ch, A34h, A4Ch INCH Threshold Port n VC0 Non-Posted (OnlyPorts 0 and 8,
where n = 0 through 3 for Station 0 ports, and n = 8 through 11 for Station 1 ports)
Serial
EEPROM
Bit(s)
Description
Type
Default
Non-Posted credits are used for Virtual Channel 0 (VC0) Memory Read, I/O Read, I/O Write, Configuration Read,
and Configuration Write transactions.
Payload
Minimum value = 0_0000_0001b.
Silicon Revision AA
Payload = 0_0000_1001b = 9 Payload Credits (144 bytes).
8:0
Silicon Revisions BA/BB/BC
Payload = 0_0000_0111b = 7 Payload Credits (112 bytes).
AA – 1209h
BA/BB/BC – 0E07h
RW
Yes
Header
Minimum value = 00_001b.
Silicon Revision AA
Header = 01_001b = 9 Header Credits.
13:9
Silicon Revisions BA/BB/BC
Header = 00_111b = 7 Header Credits.
31:14
Reserved
0-0h
Register 11-182. A08h, A20h, A38h, A50h INCH Threshold Port n VC0 Completion (Only Ports 0 and 8,
where n = 0 through 3 for Station 0 ports, and n = 8 through 11 for Station 1 ports)
Serial
EEPROM
Bit(s)
Description
Type
Default
Completion credits are used for Virtual Channel 0 (VC0) Memory Read, I/O Read, I/O Write, Configuration Read,
and Configuration Write transaction Completions.
2:0
Reserved
Payload
Reserved bits [2:0] force the Payload Credits to be a multiple of 8.
Minimum value = Maximum Payload Size (MPS; encoded in
offset 70h[7:5]) or size of largest Read request (whichever is smaller),
divided by 16, rounded up to a multiple of 8.
Minimum value for MPS or largest Read request greater than
128 bytes is 0_0001_0b; otherwise, the minimum value is 0_0000_1b.
8:3
Silicon Revision AA
Payload = 0_0101_1b = Bh, shifted left 3 bits is 58h = 88 Payload
Credits (1,408 bytes).
AA – 0A58h
BA/BB/BC – 1480h
RW
Yes
Silicon Revisions BA/BB/BC
Payload = 0_1000_0b = 10h, shifted left 3 bits is 00h = 128 Payload
Credits (2,048 bytes).
Header
Minimum value = 00_001b.
Silicon Revision AA
Header = 00_101b = 5h = 5 Header Credits.
13:9
Silicon Revisions BA/BB/BC
Header = 01_010b = Ah = 10 Header Credits.
31:14
Reserved
0-0h
280
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
PLX [ PLX TECHNOLOGY ]
