PCI7510 datasheet(83/234 Pages) TI

83 / 234 page

4–10

4.16 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 PCI7510 device is connected. The PCI7510 device 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

4.17 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 PCI7510 device is connected. The PCI7510 device 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 PCI7510 controller function.

Bit

Name

CardBus bus number

Type

Default

CardBus bus number

Offset:

19h

Type:

Read/Write

Default:

00h

4.18 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 PCI7510 device 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 register is

separate for each CardBus controller function.

Bit

Name

Subordinate bus number

Type

Default

Subordinate bus number

Offset:

1Ah

Type:

Read/Write

Default:

00h

PCI7510 Datasheet(PDF) 83 Page - Texas Instruments

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