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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
Register, this bit is a "0".
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.
02/07, Rev. 12.0 3-24 © 2007 SanDisk Corporation