SanDisk 20-10-00038, Extreme III Card Configuration and Status Register (cont)

Interface Description SanDisk CompactFlash Card OEM Product Manual

Card Configuration and Status Register (con’t)

Bit Name Description

D7 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 if the SigChg bit is a "1" and the card is configured for the I/O

interface.

D6 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

card is configured for I/O

D5 IOis8 The host sets this bit to a one "1" if the card is to be configured in an 8-bit

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

bit is ignored.

D2 PwrDwn This bit indicates whether the host requests the card to be in the power

saving or active mode. When the bit is "1", the card enters a power down

mode. When "0", the host is requesting the 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 card automatically powers down when it is idle and powers

back up when it receives a command

D1 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 that caused the interrupt request has been

serviced. If interrupts are disabled by the -IEN bit in the Device Control

3.4.4 Pin Replacement Register (Address 204h in Attribute Memory) The Pin Replacement Register information is described below.

Operation D7 D6 D5 D4 D3 D2 D1 D0

Read 0 0 CRdy/-Bsy CWProt 1 1 RRdy/-Bsy RWProt

Write 0 0 CRdy/-Bsy CWProt 0 0 MRdy/-Bsy MWProt

Bit Name Description

D5 CRdy/-Bsy This bit is set to "1" when the bit RRdy/-Bsy changes state. This bit can also

be written by the host.

D4 CWProt This bit is set to "1" when the RWprot changes state. This bit may also be

written by the host.

D1 RRdy/-Bsy This bit is used to determine the internal state of the Rdy/-Bsy signal. This

bit may be used to determine the state of the Ready/-Busy as this pin has

been reallocated for use as Interrupt Request on an I/O card. When written,

this bit acts as a mask for writing the corresponding bit CRdy/-Bsy.

MRdy/-Bsy This bit acts as a mask for writing the corresponding bit CRdy/-Bsy.

D0 RWProt This bit is always "0" because the card does not have a write-protect

switch. When written, this bit acts as a mask for writing the corresponding

bit CWProt.

MWProt This bit when written acts as a mask for writing the corresponding bit

CWProt.