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17.4 PCMCIA OPERATION
17.4.1 Memory-Only Cards
Table 17-2 shows a worst case example of host programming.
Table 17-2. Host Programming for Memory Cards
MEMORY
600NS
ACCESS
TIME
STP
LNG
HLD
CLK
100
300
CYCLE
20ns
6
24
30ns
4
16
40ns
3
12
62ns
2
8
83ns
2
6
Note: Because the minimum hold time is one clock, the real access time is access time
plus one clock. Hold time and setup time HLD and STP, in this table, are the read
or write worst case. The worst case hold time is data disable from OE. The worst
case setup time is address to strobe. Length (LNG) is the minimum strobe time.
Table 17-2 assumes you are not using the WAIT_B signal. If you are using it, then the
minimum strobe time is at least 35ns + 1 system clock.
17.4.2 I/O Cards
Table 17-3 shows a worst case example of programming PCMCIA host for I/O cycle.
Table 17-3. Host Programming For I/O Cards
Setup time worst case is for write, so setup = data_setup_before_IORD +1 system clock.
MOTOROLA
200NS
STP
LNG
HLD
150
30
120
90
8
2
8
5
5
2
5
3
4
1
4
3
3
1
2
2
2
1
2
2
STP(1)
LNG
20ns
4
8
30ns
3
6
40ns
3
4
62ns
2
3
83ns
2
2
MPC823e REFERENCE MANUAL
PCMCIA Interface
150NS
STP
LNG
HLD
STP
20
80
75
15
2
6
4
1
1
4
3
1
1
3
2
1
1
2
2
1
1
1
1
1
HLD
2
1
1
1
1
100NS
LNG
HLD
60
50
4
3
3
2
2
2
1
1
1
1
17-7
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