Register Name Offset Address
Additional Priority 49h
PCICLK Enable Bits 4Ah
Misc Control 4Bh
AutoClockRun Control 4Ch
Dual Address Cycle Enable and PCIB_SCLK_Stop Override 50h
MSI Mapping Capability 54h
Signature Register for Microsoft Rework for Subtractive Decode 58h
Prefetch Timeout Limit 5Ch
SPCI IDSEL MaskB 5Eh
Prefetch Size Control 60h
Misc Control 64h
Vender ID - R - 16 bits - [PCI_Reg: 00h] Field Name Bits Default Description
VID 15:0 100 2h Vendor ID
Vendor ID register
Device ID - R - 16 bits - [PCI_Reg: 02h] Field Name Bits Default Description
DID 15:0 4384h Device ID
Device ID register
Command - RW - 16 bits - [PCI_Reg: 04h] Field Name Bits Default Description
IO Enable 0 0b IO response enable,
0: Disabled,
1: Enabled,
PCIB responses IO space accesses on primary bus.
Memory Enable 1 0b Memory response enable, ‘0’ disabled, ‘1’ enabled, PCIB
responses memory space accesses on primary bus.
Master Enable 2 0b Master enable, ‘0’ disabled, ‘1’ enabled, the ability of PCIB
to act as a PCI bus master on primary bus.
Special Enable 3 0b Hardwired to 0 to indicate that PCIB ignores special cycles.
Mem Invalidate 4 0b Hardwired to 0 to indicate that PCIB doesn’t issue memory
write and invalidate command by itself.
VGA Snoop Enable 5 0b VGA snoop enable, when ‘0’ VGA palette write transactions
on the primary interface are ignored unless it falls into
PCIB’s IO address range. When ‘1’ VGA palette write
transactions are positively decoded and forwarded
downstream.
Parity Error Enable 6 0b Parity Error Response, ‘0’ disables PCIB to assert
P_SERR# and P_PERR# or report Detected Parity Error to
the status register, ‘1’ enables PCIB.
Addr Stepping Enable 7 0b Controls whether or not to do address/data stepping, PCIB
doesn’t. Read Only
System Error Enable 8 0b SERR# enable, ‘0’ disables PCIB to assert P_SERR# and
report Signaled System Error bit, ‘1’ enables PCIB.
Fast Back-to-Back
Enable
9 0b Hardwired to 0 to indicate that PCIB is not capable of
issuing fast back-to-back transactions on the primary bus.
Reserved 15:10 00h Reserved
PCI Command register
Status- RW - 16 bits - [PCI_Reg: 06h] Field Name Bits Default Description
Reserved 3:0 0h Reserved