OXCF950 datasheet(21/66 Pages) OXFORD

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OXCF950 rev B DATA SHEET

OXFORD SEMICONDUCTOR, INC.

5.5.2

Configuration Status Register ‘CSR’ (Offset 0xFA)

The Configuration and Status Register is an optional register, supported by the OXCF950. The register allows additional control

over a function’s configuration and reports status related to the function’s configuration.

Changed

SigChg

IOIs8

RFU

Audio

PwrDwn

Intr

IntrAck

Field

Type

Description

Changed

If a PCMCIA/CF card is using the I/O interface, the function’s Pin Replacement

Replacement Register are set to one(1), or one Event bits in the Extended Status

set this field to one (1).

If a PCMCIA/CF card is not using the I/O interface or the function’s Pin

Replacement register is not present, this field is undefined and should be

ignored.

SigChg1

R/W

This field serves as a gate for STSCHG#

If a PCMCIA/CF card is using the I/O interface and both the Changed and

SigChg fields are set to one (1), the function shall assert STSCHG#.

If a PCMCIA/CF card is using the I/O interface and this field is reset to zero (0),

the function shall not assert STSCHG#.

If a PCMCIA/CF card is not using the I/O interface or the function’s Pin

Replacement register is not present, this field is undefined and should be

ignored.

IOIs8

R/W

The host sets this field to one (1) when it can provide I/O cycles only with an 8-bit

D[7..0] data path. The card is guaranteed that accesses to the 16-bit registers will

occur as two byte accesses rather than as a single 16-bit access.

RFU

Reserved. Must be zero (0).

Audio2

R/W

This bit is set to one (1) to enable audio information on SPKR# when the card is

configured.

PwdDwn3

R/W

When the host sets this field to one (1), the function shall enter a power-down

state, if such a state exists.

If a PCMCIA/CF card function does not have a power-down state, the function

shall ignore this field.

Intr

Interrupt Request / Acknowledge – This field reports whether the function is

requesting interrupt servicing and may be used to acknowledge the host system

is ready to process another interrupt request from the PCMCIA/CF card.

The function shall set this field to one (1) when it is requesting interrupt service.

The function shall set this field to zero (0) when it is not requesting interrupt

service.

Writes to this field are ignored when the IntrAck field of all Configuration and

Status Registers on the PCMCIA/CF card are reset to zero (0).

IntrAck

R/W

Single function cards ignore this field on writes and always return zero (0).

Table 18: Configuration Status Register

Note 1

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