Intel 80312 I/O Companion Chip - ECEE

Intel ® 80312 I/O Companion ChipPCI-to-PCI Bridge Unit4.15.11 Secondary Bus Number Register - SBNRSecondary Bus Number Register bits adhere to the definitions in the PCI Local BusSpecification.This register records the bus number of the bridge Secondary interface. This registerdetermines when to respond to Type 1 configuration commands on the Primary interface andconvert them to Type 0 commands on the Secondary interface.Table 4-34.Secondary Bus Number Register - SBNRIOPAttributes7 4 0rw rw rw rw rw rw rw rwPCIAttributesrw rw rw rw rw rw rw rwPCI Configuration Offset19HIntel ® 80200 Processor Local Bus Address0000 1019HAttribute Legend:RV = ReservedPR = PreservedRS = Read/SetRW = Read/WriteRC = Read ClearRO = Read OnlyNA = Not AccessibleBit Default Description07:00 00HSecondary Bus Number - This field is programmed with the PCI bus number of the bridge Secondaryinterface.4-96 Developer’s Manual