Datasheet

PCI Express Non-Transparent Bridge
Intel
®
Xeon
®
Processor C5500/C3500 Series
Datasheet, Volume 1 February 2010
184 Order Number: 323103-001
3.19.2.13 PB45BASE: Primary BAR 4/5 Base Address
The register is used by the processor on the primary side of the NTB to setup a second
64b prefetchable memory window.
Note: SW must program upper DW first and then lower DW. If lower DW is programmed first
HW will clear the lower DW.
3.19.2.14 SUBVID: Subsystem Vendor ID (Dev#3, PCIE NTB Pri Mode)
This register identifies the vendor of the subsystem.
Register:PB45BASE
Bus:0
Device:3
Function:0
Offset:20h
Bit Attr Default Description
63:nn RWL 00h
Primary BAR 4/5 Base
Sets the location of the BAR written by SW
Notes:
• The “nn” indicates the least significant bit that is writable. The number
of bits that are writable in this register is dictated by the value loaded
into the PBAR45SZ register by the BIOS at initialization time (before
BIOS PCI enumeration).”
• For the special case where PBAR45SZ = ‘0’, bits 63:00 are all RO=’0’
resulting in the BAR being disabled.
• These bits will appear to SW as RW.
(nn-1) :
12
RWL 00h
Reserved
Reserved bits dictated by the size of the memory claimed by the BAR.
Set by Section 3.19.3.20, “PBAR45SZ: Primary BAR 4/5 Size”
Granularity must be at least 4 KB.
Notes:
• For the special case where PBAR45SZ = ‘0’, bits 63:00 are all RO=’0’
resulting in the BAR being disabled.
• These bits will appear to SW as RO.
11:04 RO 00h
Reserved
Granularity must be at least 4 KB.
03 RO 1b
Prefetchable
BAR points to Prefetchable memory.
02:01 RO 10b
Type
Memory type claimed by BAR 4/5 is 64-bit addressable.
00 RO 0b
Memory Space Indicator
BAR resource is memory (as opposed to I/O).
Register:SUBVID
Bus:0
Device:3
Function:0
Offset:2Ch
Bit Attr Default Description
15:0 RWO 0000h
Subsystem Vendor ID: This field must be programmed during boot-up to
indicate the vendor of the system board. When any byte or combination of
bytes of this register is written, the register value locks and cannot be further
updated.