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Functional Architecture Intel® Server Board SE7520JR2
Revision 1.0
C78844-002
50
hierarchical PCI bus under the current bridge. The PCI bus number and the subordinate PCI
bus number are the same in the last hierarchical bridge.
3.4.1.7 Device Number and IDSEL Mapping
Each device under a PCI bridge has its IDSEL input connected to one bit out of the PCI bus
address/data signals AD[31::11] for the PCI bus. Each IDSEL-mapped AD bit acts as a chip
select for each device on PCI. The host bridge responds to a unique PCI device ID value that,
along with the bus number, cause the assertion of IDSEL for a particular device during
configuration cycles. The following table shows the correspondence between IDSEL values and
PCI device numbers for the PCI bus. The lower five bits of the device number are used in
CONFIG_ADDRESS bits [15::11].