SST48CF016 datasheet(25/60 Pages) SST

25 / 60 page

Data Sheet

CompactFlash Card

SST48CF008 / 016 / 024 / 032 / 048 / 064 / 096 / 128 / 192 / 256

S71125-03-000

9/01

375

2.4.3 Card Configuration and Status Register (Address 202H in Attribute Memory)

The Card Configuration and Status Register contains information about the card’s condition.

Changed

Indicates that one or both of the Pin Replacement register CRdy or CWProt bits are set

to one (1). When the Changed bit is set, Pin 46 (-STSCHG) is held low if the SigChg bit

is a One (1) and the CompactFlash card is configured for the I/O interface.

SigChg

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

the Status Register, the Changed bit control pin 46 the Changed Status signal. If no state

change signal is desired, this bit should be set to zero (0) and pin 46 (-STSCHG) signal

will be held high while the CompactFlash card is configured for I/O

IOis8

The host sets this bit to a one (1) if the CompactFlash card is to be configured in an 8-bit

I/O Mode. The CompactFlash card is always configured for both 8- and 16-bit I/O, so this

bit is ignored.

PwrDwn

This bit indicates whether the host requests the CompactFlash card to be in the power

saving or active mode. When the bit is one (1), the CompactFlash card enters a power

down mode. When zero (0), the host is requesting the CompactFlash card to enter the

active mode. The PCMCIA Rdy/-Bsy value becomes BUSY when this bit is changed.

Rdy/-Bsy will not become Ready until the power state requested has been entered. The

CompactFlash card automatically powers down when it is idle and powers back up when

it receives a command.

Int

This bit represents the internal state of the interrupt request. This value is available

whether or not I/O interface has been configured. This signal remains true 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 a zero (0).

TABLE

2-14: CARD CONFIGURATIONS

Conf5

Conf4

Conf3

Conf2

Conf1

Conf0

Disk Card Mode

0000

Memory Mapped

0000

I/O Mapped, any 16 Byte system

decoded boundary

0001

I/O Mapped, 1F0H-1F7H/3F6H-3F7H

0001

I/O Mapped, 170H-177H/376H-377H

T2-14.0 375

CARD CONFIGURATION AND STATUS REGISTER ORGANIZATION

Operation

D7D6

D5D4D3D2

D1D0

Read

Changed

SigChg

IOis8

PwrDwn

Int

Write

SigChg

IOis8

PwrDwn

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