SMC032BFY6 datasheet(35/91 Pages) STMICROELECTRONICS

35 / 91 page

SMCxxxBF

Card Configuration

35/91

6.2

Card Configuration and Status Register (202h in Attribute

Memory)

The Card Configuration and Status Register contains information about the Card’s status

(see Table 28).

6.2.1

Changed

Indicates that one or both of the Pin Replacement register (CRDY, or CWProt) bits are set to

‘1’. When the Changed bit is set, –STSCHG (Pin 46) is held Low and if the SigChg bit is ‘1’

the Card is configured for the I/O interface.

6.2.2

SigChg

This bit is set and reset by the host to enable and disable a state-change signal from the

Status Register (issued on Status Changed pin 46). If no state change signal is desired, this

bit should be set ‘0’ and pin 46 (–STSCHG) will be held High while the Card is configured for

I/O.

6.2.3

IOis8

The host sets this bit to ‘1’ if the Card is to be configured in 8 bit I/O Mode. The Card is

always configured for both 8 and 16 bit I/O, so this bit is ignored.

6.2.4

PwrDwn

This bit indicates whether the Card is in the power saving mode or active mode. When the

PwrDwn bit is set to ‘1’, the Card enters power down mode. When set to ‘0’, the Card enters

active mode. The READY value on Pin Replacement Register becomes BUSY when this bit

is changed. READY will not become Ready until the power state requested has been

entered. The Card automatically powers down when it is idle and powers back up when it

receives a command.

6.2.5

Int

This bit represents the internal state of the interrupt request. It is available whether or not

the I/O interface has been configured. It remains valid until the condition which caused the

interrupt request has been serviced. If interrupts are disabled by the –IEN bit in the Device

Control Register, this bit is ‘0’.

Table 27.

CompactFlash Memory Card Configurations

Conf5

Conf4

Conf3

Conf2

Conf1

Conf0

Mapping Mode

Card

Mode

Task File Register Address

Memory

0h - Fh, 400h - 7FFh

Contiguous I/O

I/O

xx0h - xxFh

Primary I/O

I/O

1F0h - 1F7h, 3F6h - 3F7h

Secondary I/O

I/O

170h - 177h, 376h - 377h

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