PCI7621 datasheet(91/298 Pages) TI

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4−1

4 PC Card Controller Programming Model

This chapter describes the PCI7x21/PCI7x11 PCI configuration registers that make up the 256-byte PCI configuration

header for each PCI7x21/PCI7x11 function. There are some bits which affect both CardBus functions, but which, in

order to work properly, must be accessed only through function 0. These are called global bits. Registers containing

one or more global bits are denoted by § in Table 4−2.

Any bit followed by a † is not cleared by the assertion of PRST (see CardBus Bridge Power Management,

Section 3.8.10, for more details) if PME is enabled (PCI offset A4h, bit 8). In this case, these bits are cleared only by

GRST. If PME is not enabled, then these bits are cleared by GRST or PRST. These bits are sometimes referred to

as PME context bits and are implemented to allow PME context to be preserved during the transition from D3hot or

D3cold to D0.

If a bit is followed by a ‡, then this bit is cleared only by GRST in all cases (not conditional on PME being enabled).

These bits are intended to maintain device context such as interrupt routing and MFUNC programming during warm

resets.

A bit description table, typically included when the register contains bits of more than one type or purpose, indicates

bit field names, a detailed field description, and field access tags which appear in the type column. Table 4−1

describes the field access tags.

Table 4−1. Bit Field Access Tag Descriptions

ACCESS TAG

NAME

MEANING

Read

Field can be read by software.

Write

Field can be written by software to any value.

Set

Field can be set by a write of 1. Writes of 0 have no effect.

Clear

Field can be cleared by a write of 1. Writes of 0 have no effect.

Update

Field can be autonomously updated by the PCI7x21/PCI7x11 controller.

4.1

PCI Configuration Register Map (Functions 0 and 1)

The PCI7x21/PCI7x11 is a multifunction PCI device, and the PC Card controller is integrated as PCI functions 0 and

1. The configuration header, compliant with the PCI Local Bus Specification as a CardBus bridge header, is

PC99/PC2001 compliant as well. Table 4−2 illustrates the PCI configuration register map, which includes both the

predefined portion of the configuration space and the user-definable registers.

Table 4−2. Functions 0 and 1 PCI Configuration Register Map

OFFSET

Device ID

Vendor ID

00h

Status ‡

Command

04h

Class code

Revision ID

08h

BIST

Header type

Latency timer

Cache line size

0Ch

CardBus socket registers/ExCA base address register

10h

Secondary status ‡

Reserved

Capability pointer

14h

CardBus latency timer

Subordinate bus number

CardBus bus number

PCI bus number

18h

CardBus memory base register 0

1Ch

CardBus memory limit register 0

20h

CardBus memory base register 1

24h

CardBus memory limit register 1

28h

‡ One or more bits in this register are cleared only by the assertion of GRST.

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