SMCXXXAF Datasheet, PDF (33/82 Pages) Numonyx B.V – 32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte and 512 Mbyte 3.3 V / 5 V supply CompactFlash™ card

SMCxxxAF
Card configuration
6.3
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
6.3.6
Pin Replacement register (base + 04h in attribute memory)
This register contains information on the state of the READY signal when configured in
memory mode and the IREQ signal in I/O mode. See Table 28 and Table 29.
CReady
This bit is set to ‘1’ when the bit RReady changes state. This bit can also be written by the
host.
CWProt
This bit is set to '1' when the bit RWProt changes state. This bit can also be written by the
host.
RReady
This bit is used to determine the internal state of the Ready signal. In I/O mode it is used as
an interrupt request. When written, this bit acts as a mask (MReady) for writing the
corresponding bit CReady.
WProt
This bit is always ‘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 CWProt bit.
MReady
This bit acts as a mask for writing the corresponding CReady bit.
MWProt
This bit when written acts as a mask for writing the corresponding CWProt bit.
Table 28. Pin Replacement register (default value: 0Ch)
Operation
D7
D6
D5
D4
D3
D2
Read
0
0
CReady CWProt
1
1
Write
0
0
CReady CWProt
0
0
Table 29. Pin Replacement Changed bit/Mask bit values
Initial value of
‘C’ status
Written by host
‘C’ bit
‘M’ bit
Final ‘C’ bit
0
X
0
0
1
X
0
1
X
0
1
0
X
1
1
1
D1
D0
RReady WProt
RReady MWProt
Comments
Unchanged
Unchanged
Cleared by host
Set by host
33/82