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09/18/00 Rev 1.1
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PI7C7100
3-Port PCI Bridge
ADVANCE INFORMATION
13. Configuration Registers
As PI7C7100 supports two secondary interfaces, it has two sets of configuration registers which are almost identical
and accessed through different function numbers. The description below is for one set only.
PCI configuration defines a 64-byte space (configuration header) to define various attributes of the PCI-to-PCI Bridge
as shown below. All of the registers in bold type are required by the PCI specification and are implemented in this
bridge. The others are available for use as control registers for the device. There are two configuration registers:
Configuration Register 1 and Configuration Register 2 corresponding to Secondary bus 1 and Secondary bus 2
interfaces respectively. Also, the configuration for the primary interface is implemented through the Configuration
Register 1.
4
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A
13.1 Configuration Register 1