Information Technology Reference
In-Depth Information
Table 8.1
PCMCIA connections
Pin
Signal
Pin
Signal
Pin
Signal
Pin Signal
1
GND
18
Vpp1
35
GND
52 Vpp2
2
D3
19
A16
36
See below
53 A22
3
D4
20
A15
37
D11
54 A23
4
D5
21
A12
38
D12
55 A24
5
D6
22
A7
39
D13
56 A25
6
D7
23
A6
40
D14
57
RFU
58
RESE
T
7
CARD ENABLE 1
24
A5
41
D15
8
A10
25
A4
42
See below
59
WAIT
REF
RESH
60
9
OUTPUT ENABLE
26
A3
43
INPACK
10
A11
27
A2
44
IOR
61
REGIS
TER SELECT
11
A9
28
A1
45
IOW
62
SPKR
12
A8
29
A0
46
A17
63
STSCHG
13
A13
30
D0
47
A18
64 D8
14
A14
31
D1
48
A19
65 D9
15
See below
32
D2
49
A20
66 D10
IOIS16
16
33
50
A21
67
CARD DETECT 2
READY
/
BUSY
+5V
17
34
GND
51
+5V
68 GND
Pin 15
WRITE ENABLE
/ PROGRAM
Pin 33
IOIS16
(Write Protect)
Pin 36
CARD DETECT 1
Pin 42
CARD
ENABLE
2
•
CARD
-
used to enable the upper 8-bits of the data bus
(
CARD ENABLE 1
) and/or the lower 8 bits of the data bus (
CARD ENABLE 1
,
ENABLE
2
).
CARD
ENABLE
2
•
OUTPUT ENABLE
-
set low by the computer when reading data from the PCMCIA unit.
•
REGISTER SELECT
-
set high when accessing common memory or a low when accessing
attribute memory.
•
RESET -
used to reset the PCMCIA card.
•
REFRESH -
used to refresh PCMCIA memory.
•
WAIT
-
used by the PCMCIA device when it cannot transfer data fast enough and re-
quests a wait cycle.
•
WRITE ENABLE / PROGRAM
-
used to program the PCMCIA device.
•
Vpp1, Vpp2 -
programming voltages for flash memories.
•
READY
-
used by the PCMCIA card when it is ready to process more data (when a
high) or is still occupied by a previous access (when it is a low).
/
BUSY
•
IOIS16
-
used to indicate the state of the write-protect switch on the PCMCIA card. A
high level indicates that the write-protect switch has been set.
•
INPACK
-
used by the PCMCIA card to acknowledge the transfer of a signal.
•
IOR
-
used to issue an I/O read access from the PCMCIA card (must be used with an
active
REGISTER SELECT
signal).
•
IOW
-
used to issue an I/O write access to the PCMCIA card (must be used with an ac-
tive
REGISTER SELECT
signal).
•
SPKR
-
used by PCMCIA card to send audio data to the system speaker.
•
STSCHG
-
used to identify that the card has changed its status.
