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Processor Configuration Registers
94 Datasheet, Volume 2
2.6.11 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: 0/1/0–2/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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