Manual

220 Series Commercial Grade CF Product Manual v2.0Cactus Technologies

IOis8 The host sets this bit to a one (1) if the CompactFlash Memory Card is to be

congured in an 8-bit I/O mode. The CompactFlash Card is always congured for

both 8- and 16-bit I/O, so this bit is ignored.

PwrDwn This bit indicates whether the host requests the CompactFlash Memory 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 PC Card 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 congured. 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

zero (0).

CRdy/-Bsy This bit is set to one (1) when the bit RRdy/-Bsy changes state. This bit can also

be written by the host.

CWProt This bit is set to one (1) when the RWprot changes state. This bit may also be

written by the host.

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.

RWProt This bit is always zero (0) since the CompactFlash Memory Card does not have

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

corresponding bit CWProt.

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

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

3.4.4. Pin Replacement Register

(Address 204h in Attribute Memory)

The Card Conguration and Status Register contain information about the Card’s condition.

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

Table 3-13. Pin Replacement Register