smc256af Numonyx, smc256af Datasheet - Page 33

• Manufacturer Part Number: smc256af
• Description: 32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte And 512 Mbyte 3.3 V / 5 V Supply Compactflash? Card
• Manufacturer: Numonyx

SMCxxxAF
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
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.
Table 29.
Operation
Initial value of
Read
Write
‘C’ status
X
X
0
1
Pin Replacement register (default value: 0Ch)
Pin Replacement Changed bit/Mask bit values
D7
0
0
‘C’ bit
X
X
0
1
D6
0
0
Written by host
CReady
CReady
D5
‘M’ bit
CWProt
CWProt
0
0
1
1
D4
Table 28
D3
1
0
Final ‘C’ bit
0
1
0
1
and
D2
1
0
Table
Card configuration
RReady
RReady
29.
Cleared by host
D1
Comments
Unchanged
Unchanged
Set by host
MWProt
WProt
D0
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