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©2008 Advanced Micro Devices, Inc.
Host PCI Bridge Registers (Device 20, Function 4)
AMD SB600 Register Reference Manual Proprietary Page 268
Primary Bus Number- RW - 8 bits - [PCI_Reg: 18h]
Field Name Bits Default Description
Primary Bus Number 7:0 00h Bus number of the PCI bus to which the primary interface is
connected.
Primary Bus Number register
Secondary Bus Number - RW - 8 bits - [PCI_Reg: 19h]
Field Name Bits Default Description
Secondary Bus Number 7:0 00h Bus number of the PCI bus to which the secondary interface
is connected.
Secondary Bus Number register
SUBBN- RW - 8 bits - [PCI_Reg: 1Ah]
Field Name Bits Default Description
SubordinateBusNum 7:0 00h Bus number of the highest numbered PCI bus behind PCIB.
Subordinate Bus Number register
Secondary Latency Timber- RW - 8 bits - [PCI_Reg: 1Bh]
Field Name Bits Default Description
Secondary Latency
Timer
7:0 00h Secondary Master latency control timer. Sets the minimum
time that the Secondary bus master can retain the
ownership of the bus.
Secondary Master Latency Timer register
IO Base- RW - 8 bits - [PCI_Reg: 1Ch]
Field Name Bits Default Description
IO16 1:0 00b Indicates a 16-bit IO address space. Read Only
Can be changed to 32-bit when bit[29] of regx48 is set
Reserved 3:2 00b Reserved
IOBase 7:4 0h Defines the bits [15:12] of the base address of 16-bit or 32-
bit IO space.
IO base register
IO Limit- RW - 16 bits - [PCI_Reg: 1Dh]
Field Name Bits Default Description
IO16 1:0 00b Indicates a 16-bit IO address space. Read Only
Can be changed to 32-bit when bit[29] of regx48 is set
Reserved 3:2 00b Reserved
IO Limit 7:4 0h Defines bits [15:12] of the limit of 16-bit or 32-bit IO space.
IO Limit register
Secondary Status- RW - 16 bits - [PCI_Reg: 1Eh]
Field Name Bits Default Description
Reserved 4:0 00h Reserved
Sec 66MHz Capable 5 0b Indicates PCIB doesn’t support 66MHz secondary interface.
Read Only.
Reserved 6 0b Reserved
Secondary Fast Back-
to-Back Capable
7 1b Indicates PCIB is capable of accepting fast back-to-back
transactions on the secondary bus. Read Only.
Secondary Master Data
Parity Error
8 0b Master Data Parity Error on the secondary bus, assertion of
S_PERR# (when PCIB acts as a master) is received, write
clears it.
Secondary DevSel
Timing
10:9 01b DEVSEL# timing, indicates PCIB will assert DEVSEL# with
medium timing on the secondary bus. Read Only.
Secondary Target Abort 11 0b Signaled Target Abort on the secondary bus, write clears it.