26
ST1 Series Product Manual, Rev. A
Note.
RFU is Reserved for Future Use
[1] These signals are required only for 16 bit accesses and not required when installed in 8 bit systems.
Devices should allow for 3-state signals not to consume current.
[2] The signal should be grounded by the host.
[3] The signal should be tied to VCC by the host.
[4] The mode is optional for CF+ Cards, but required for CompactFlash Storage Cards.
[5] The -CSEL signal is ignored by the card in PC Card modes. However, because it is not pulled up on the
card in these modes, it should not be left floating by the host in PC Card modes. In these modes, the pin
should be connected by the host to PC Card A25 or grounded by the host.
[6] If DMA operations are not used, the signal should be held high or tied to VCC by the host. For proper
operation in older hosts: while DMA operations are not active, the card shall ignore this signal, including a
floating condition.
24
WP
O
OT3
24
-IOIS16
O
OT3
24
-IOIS16
O
ON3
25
-CD2
O
Ground
25
-CD2
O
Ground
25
-CD2
O
Ground
26
-CD1
O
Ground
26
-CD1
O
Ground
26
-CD1
O
Ground
27
D11
[1]
I/O
I1Z, OZ3
27
D11
[1]
I/O
I1Z, OZ3
27
D11
[1]
I/O
I1Z, OZ3
28
D12
[1]
I/O
I1Z, OZ3
28
D12
[1]
I/O
I1Z, OZ3
28
D12
[1]
I/O
I1Z, OZ3
29
D13
[1]
I/O
I1Z, OZ3
29
D13
[1]
I/O
I1Z, OZ3
29
D13
[1]
I/O
I1Z, OZ3
30
D14
[1]
I/O
I1Z, OZ3
30
D14
[1]
I/O
I1Z, OZ3
30
D14
[1]
I/O
I1Z, OZ3
31
D15
[1]
I/O
I1Z, OZ3
31
D15
[1]
I/O
I1Z, OZ3
31
D15
[1]
I/O
I1Z, OZ3
32
-CE2
[1]
I
I3U
32
-CE2
[1]
I
I3U
32
-CS1
[1]
I
I3Z
33
-VS1
O
Ground
33
-VS1
O
Ground
33
-VS1
O
Ground
34
-IORD
I
I3U
34
-IORD
I
I3U
34
-IORD
I
I3Z
35
-IORW
I
I3U
35
-IORW
I
I3U
35
-IORW
I
I3Z
36
-WE
I
I3U
36
-WE
I
I3U
36
-WE
[3]
I
I3U
37
READY
O
OT1
37
-IREQ
O
OT1
37
INTRQ
O
OZ1
38
VCC
Power
38
VCC
Power
38
VCC
Power
39
-CSEL
[5]
I
I2Z
39
-CSEL
[5]
I
I2Z
39
-CSEL
I
I2U
40
-VS2
O
OPEN
40
-VS2
O
OPEN
40
-VS2
O
OPEN
41
RESET
I
I2Z
41
RESET
I
I2Z
41
-RESET
I
I2Z
42
-WAIT
O
OT1
42
-WAIT
O
OT1
42
IORDY
O
ON1
43
-INPACK
O
OT1
43
-INPACK
O
OT1
43
DMARC
O
OZ1
44
-REG
I
I3U
44
-REG
I
I3U
44
-DMACK
[6]
I
I3U
45
BVD2
O
OT1
45
-SPKR
O
OT1
45
-DASP
I/O
I1U, ON1
46
BVD1
O
OT1
46
-STSCHG
O
OT1
46
-PDIAG
I/O
I1U, ON1
47
D08
[1]
I/O
I1Z, OZ3
47
D08
[1]
I/O
I1Z, OZ3
47
D08
[1]
I/O
I1Z, OZ3
48
D09
[1]
I/O
I1Z, OZ3
48
D09
[1]
I/O
I1Z, OZ3
48
D09
[1]
I/O
I1Z, OZ3
49
D10
[1]
I/O
I1Z, OZ3
49
D10
[1]
I/O
I1Z, OZ3
49
D10
[1]
I/O
I1Z, OZ3
50
GND
Ground
50
GND
Ground
50
GND
Ground
Table 8:
Compa interface connector signals
PC Card Memory Mode
PC Card I/O Mode
True IDE Mode
[4]
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