PCI6621 datasheet(86/204 Pages) TI

86 / 204 page

4−10

4.15 PCI Bus Number Register

The PCI bus number register is programmed by the host system to indicate the bus number of the PCI bus to which

the PCI6x21/PCI6x11 controller is connected. The PCI6x21/PCI6x11 controller uses this register in conjunction with

the CardBus bus number and subordinate bus number registers to determine when to forward PCI configuration

cycles to its secondary buses.

Bit

Name

PCI bus number

Type

Default

PCI bus number

Offset:

18h (Functions 0, 1)

Type:

Read/Write

Default:

00h

4.16 CardBus Bus Number Register

The CardBus bus number register is programmed by the host system to indicate the bus number of the CardBus bus

to which the PCI6x21/PCI6x11 controller is connected. The PCI6x21/PCI6x11 controller uses this register in

conjunction with the PCI bus number and subordinate bus number registers to determine when to forward PCI

configuration cycles to its secondary buses. This register is separate for each PCI6x21/PCI6x11 controller function.

Bit

Name

CardBus bus number

Type

Default

CardBus bus number

Offset:

19h

Type:

Read/Write

Default:

00h

4.17 Subordinate Bus Number Register

The subordinate bus number register is programmed by the host system to indicate the highest numbered bus below

the CardBus bus. The PCI6x21/PCI6x11 controller uses this register in conjunction with the PCI bus number and

CardBus bus number registers to determine when to forward PCI configuration cycles to its secondary buses. This

Bit

Name

Subordinate bus number

Type

Default

Subordinate bus number

Offset:

1Ah

Type:

Read/Write

Default:

00h

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