PCI6421 datasheet(161/204 Pages) TI

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8−1

8 SD Host Controller Programming Model

This section describes the internal PCI configuration registers used to program the PCI6x21/PCI6x11 SD host

controller interface. All registers are detailed in the same format: a brief description for each register is followed by

the register offset and a bit table describing the reset state for each register.

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.

The PCI6x21/PCI6x11 controller is a multifunction PCI device. The SD host controller core is integrated as PCI

function 4. The function 4 configuration header is compliant with the PCI Local Bus Specification as a standard

header. Table 8−1 illustrates the configuration header that includes both the predefined portion of the configuration

space and the user-definable registers.

Table 8−1. Function 4 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

Slot 0 base address

10h

Slot 1 base address

14h

Slot 2 base address

18h

Reserved

1Ch−28h

Subsystem ID ‡

Subsystem vendor ID ‡

2Ch

Reserved

30h

Reserved

PCI power

management

capabilities pointer

34h

Reserved

38h

Maximum latency

Minimum grant

Interrupt pin

Interrupt line

3Ch

Reserved

Slot information

40h

Reserved

44h−7Ch

Power management capabilities

Next item pointer

Capability ID

80h

PM data

(Reserved)

PMCSR_BSE

Power management control and status ‡

84h

Reserved

General control ‡

88h

Subsystem alias

8Ch

Diagnostic ‡

90h

Reserved

Slot 0 3.3-V

maximum current

94h

Reserved

Slot 1 3.3-V

maximum current

98h

Reserved

Slot 2 3.3-V

maximum current

9Ch

Reserved

A0h−FCh

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

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