Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
Integrated I/O (IIO) Configuration Registers
202
Intel
®
 Xeon
® 
Processor E7-2800/4800/8800 v2 Product Family
Datasheet Volume Two: Functional Description, February 2014
14.2.11 PBUS
Primary Bus Number Register.
14.2.12 SECBUS
Secondary Bus Number Register.
14.2.13 SUBBUS
Subordinate Bus Number Register.
Type:
CFG
PortID:
N/A
Bus:
0
Device:
0Function:0 (PCIe* Mode)
Bus:
0
Device:
2Function:0-3
Bus:
0
Device:
3Function:0-3
Offset:
0x18
Bit
Attr
Default
Description
7:0
RW
0x0
pbn:
Configuration software programs this field with the number of the bus on the 
primary side of the bridge. This register has to be kept consistent with the 
Internal Bus Number 0 in the CPUBUSNO01 register. BIOS (and OS if internal 
bus number gets moved) must program this register to the correct value 
since IIO hardware would depend on this register for inbound configuration 
cycle decode purposes.
Type:
CFG
PortID:
N/A
Bus:
0
Device:
0Function:0 (PCIe* Mode)
Bus:
0
Device:
2Function:0-3
Bus:
0
Device:
3Function:0-3
Offset:
0x19
Bit
Attr
Default
Description
7:0
RW
0x0
sbn:
This field is programmed by configuration software to assign a bus number to 
the secondary bus of the virtual P2P bridge. IIO uses this register to either 
forward a configuration transaction as a Type 1 or Type 0 to PCI Express.
Type:
CFG
PortID:
N/A
Bus:
0
Device:
0Function:0 (PCIe* Mode)
Bus:
0
Device:
2Function:0-3
Bus:
0
Device:
3Function:0-3
Offset:
0x1a
Bit
Attr
Default
Description
7:0
RW
0x0
subordinate_bus_number:
This register is programmed by configuration software with the number of the 
highest subordinate bus that is behind the PCI Express port. Any transaction 
that falls between the secondary and subordinate bus number (both 
inclusive) of an Express port is forwarded to the express port.
downloadlike
ArtboardArtboardArtboard
Report Bug