ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22
Figure 26. Normal Byte Read/Write Timing
-REG,
A[25:0]
t3
t1
t2
IOWR, -IORD,
-OE, -WE
-CE1
-CE2
D[7:0]
Write Cycle
Odd/Even Data
D[7:0]
Odd/Even Data
Read Cycle
D[15:8]
Read or
XX
Write Cycle
NOTE: Figure 26 applies to all other byte accesses, including odd I/O cycles where -IOIS16 is low.
Table 35. 16-Bit System to 8-Bit I/O Card: Odd Byte Timing
Symbol
Parameter
MIN
MAX
Units
t
Address change to -IOIS16 inactive4
-IOIS16 inactive to -CE2 inactive
-IOIS16 inactive to -CE1 active
Address setup to Command active1
Command pulse width2
(3Tcp) + 10
ns
ns
ns
ns
ns
ns
1
t
t
t
t
t
20
20
2
3
4
5
6
(S × Tcp) – 10
(C × Tcp) – 10
(R × Tcp) – 10
Address hold from Command inactive3
1. The Setup time is determined by the value programmed into the Setup Timing register, index 3Ah/3Dh. Using the Timer Set
0 default value of 01h, the setup time would be 70 ns. S = (N
page 109.
× N + 1), see “PC Card Bus Timing Calculations” on
pres
val
2. The Command time is determined by the value programmed into the Command Timing register, index 3Bh/3Eh. Using the
Timer Set 0 default value of 06h, the Command time would be 270 ns. C = (N × N + 1), see page 109.
pres
val
3. The Recovery time is determined by the value programmed into the Recovery Timing register, index 3Ch/3Fh. Using the
Timer Set 0 default value of 03h, the hold (Recovery) time would be 150 ns. R = (N × N + 1), see page 109.
pres
val
4. -IOIS16 level from card should be valid before -IOWR/-IORD goes active. For a typical setup time of 70 ns, a PC Card
meeting the PCMCIA specification for -IOIS16 from A[25:0] change will meet this condition.
Datasheet
115
INTEL [ INTEL ]
