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Datasheet, Volume 2 169
Processor Configuration Registers
2.10.9 PBUSN—Primary Bus Number Register
This register identifies that this "virtual" Host-PCI Express* bridge is connected to PCI
bus 0.
2.10.10 SBUSN—Secondary Bus Number Register
This register identifies the bus number assigned to the second bus side of the "virtual"
bridge; that is, to PCI Express-G. This number is programmed by the PCI configuration
software to allow mapping of configuration cycles to PCI Express-G.
2.10.11 SUBUSN—Subordinate Bus Number Register
This register identifies the subordinate bus (if any) that resides at the level below PCI
Express-G. This number is programmed by the PCI configuration software to allow
mapping of configuration cycles to PCI Express-G.
B/D/F/Type: 0/6/0/PCI
Address Offset: 18h
Reset Value: 00h
Access: RO
Size: 8 bits
Bit Access
Reset
Value
RST/
PWR
Description
7:0 RO 00h Uncore
Primary Bus Number (BUSN)
Configuration software typically programs this field with the
number of the bus on the primary side of the bridge. Since the
processor root port is an internal device and its primary bus is
always 0, these bits are read only and are hardwired to 0.
B/D/F/Type: 0/6/0/PCI
Address Offset: 19h
Reset Value: 00h
Access: RW
Size: 8 bits
Bit Access
Reset
Value
RST/
PWR
Description
7:0 RW 00h Uncore
Secondary Bus Number (BUSN)
This field is programmed by configuration software with the bus
number assigned to PCI Express-G.
B/D/F/Type: 0/6/0/PCI
Address Offset: 1Ah
Reset Value: 00h
Access: RW
Size: 8 bits
Bit Access
Reset
Value
RST/
PWR
Description
7:0 RW 00h Uncore
Subordinate Bus Number (BUSN)
This register is programmed by configuration software with the
number of the highest subordinate bus that lies behind the
processor root port bridge. When only a single PCI device resides
on the PCI Express-G segment, this register will contain the same
value as the SBUSN1 register.
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