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©2008 Advanced Micro Devices, Inc.
Host PCI Bridge Registers (Device 20, Function 4)
AMD SB600 Register Reference Manual Proprietary Page 267
Status- RW - 16 bits - [PCI_Reg: 06h]
Field Name Bits Default Description
Capabilities List 4 0b Read only. This bit is 1 when Offset 40h [3] = 1. At other
time this bit is 0.
0 – Bridge does not support the Capabilities List
1 – Bridge supports the Capabilities List (Offset 34h is the
pointer to the data structure).
66MHz Capable 5 1b Hardwired to 1 to indicate PCIB support of 66MHz primary
interface.
Reserved 6 0b Reserved
Fast Back-to-Back
Capable
7 1b Hardwired to 1 to indicate PCIB is capable of accepting fast
back-to-back transactions on the primary bus.
Master Parity Error 8 0b Master Data Parity Error, assertion of P_PERR# (when
PCIB acts as a master) is received, write clears it.
DevSel Timing 9:10 01b Hardwired to 01b to indicate PCIB will assert DEVSEL# with
medium timing.
Target Abort 11 0b Signaled Target Abort, write clears it.
Received Target Abort 12 0b Received Target Abort, write clears it.
Received Master Abort 13 0b Received Master Abort, write clears it.
Master Abort 14 0b Signaled System Error bit, write clears it.
Parity Error 15 0b Detected Parity Error, PCIB detected a parity error and will
assert P_PERR#, write clears it.
PCI device status register.
Revision ID/Class Code- R - 32 bits - [PCI_Reg: 08h]
Field Name Bits Default Description
Revision ID 7:0 00h These bits are hardwired to 00h to indicate the revision level
of the chip design (for the SB600).
Class Code 31:8 060401h/
060400h
A class code of 06h indicates a bridge device, a subclass
code of 04h indicates PCI bridge and a programming
interface of ‘01h’ indicates subtractive decoding on primary
bus is supported. Based on Reg0x4B[7], this register is
programmed as positive decode bridge or subtractive
decode bridge.
Revision ID/Class Code register.
Cache Line Size- RW - 8 bits - [PCI_Reg: 0Ch]
Field Name Bits Default Description
Cache Line Size 7:0 00h Read Only
Cache line size register
Primary Master Latency Timer- RW - 8 bits - [PCI_Reg: 0Dh]
Field Name Bits Default Description
Prim Latency Timer 7:0 00h Primary master latency timer. Sets the minimum time that
the Primary bus master can retain the ownership of the bus.
Primary Master Latency timer register
Header Type- R - 8 bits - [PCI_Reg: 0Eh]
Field Name Bits Default Description
Header Type 7:0 81h Indicates the bridge is a multi-function device.
Header type register