SST55LC100M datasheet(21/75 Pages) SST

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Advance Information

CompactFlash Card Controller

SST55LC100M

S71316-00-000

3/06

8.3 Pin Replacement Register (Address 204H in Attribute Memory)

CRDY/BSY# This bit is set to one (1) when the bit RDY/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.

RDY/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#.

WProt:

This bit is always zero (0).

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.

8.4 Socket and Copy Register (Address 206H in Attribute Memory)

This register contains additional configuration information. This register is always written by the system before writ-

ing the card’s Configuration Index register.

Reserved

This bit is reserved for future standardization. This bit must be set to zero (0) by the

software when the register is written.

Drive #

This bit indicates the drive number of the card for twin card configuration.

Twin card configuration is currently not supported

The socket number is ignored by the CompactFlash card.

Operation

Read

CRDY/BSY#

CWProt

RDY/BSY#

WProt

Write

CRDY/BSY#

CWProt

MRDY/BSY#

MWProt

TABLE

8-6: Pin Replacement Changed Bit/Mask Bit Values

Initial Value of (C) Status

Written by Host

Final “C” Bit

Comments

“C” Bit

“M” Bit

Unchanged

Cleared by host

Set by host

T8-6.0 1316

Socket and Copy Register Organization:

Operation

D7D6D5D4D3D2D1D0

Read

Reserved

Drive #

0000

Write

Drive #

XXXX

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