GL9701 PCI ExpressTM to PCI Bridge
5.6 IDSEL Mapping
While receiving a Type1 Configuration Cycle from the upstream PCI Express port, GL9701 will convert it
into a Type0 Configuration Cycle if the bus number is within the range specified by the Primary Bus Number
Register and the Secondary Bus Number Register.
The format of a Type0 Configuration Cycle is as followed:
GL9701 converts the destination ID device number to one of the AD[31:16] as the IDSEL of the five PCI slots.
The mapping between the AD[31:16] and Device Number is:
Device Number [4:0]
AD[31:16]
00000
0000_0000_0000_0001
00001
00010
00011
0000_0000_0000_0010
0000_0000_0000_0100
0000_0000_0000_1000
00100
00101
0000_0000_0001_0000
0000_0000_0010_0000
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