MPC875 Freescale Semiconductor, Inc, MPC875 Datasheet - Page 38

• Manufacturer Part Number: MPC875
• Description: Mpc875 Powerquicc Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

Bus Signal Timing
Table 12
1
38
Num
P44
P45
P46
P47
P48
P49
P50
P51
P52
P53
P54
P55
P56
PSST = 1. Otherwise add PSST times cycle time.
PSHT = 0. Otherwise add PSHT times cycle time.
These synchronous timings define when the WAITA signals are detected in order to freeze (or relieve) the PCMCIA current
cycle. The WAITA assertion will be effective only if it is detected 2 cycles before the PSL timer expiration. See Chapter 16,
“PCMCIA Interface,” in the MPC885 PowerQUICC™ Family Reference Manual .
A(0:31), REG valid to PCMCIA strobe
asserted
A(0:31), REG valid to ALE negation
(MIN = 1.00 × B1 – 2.00)
CLKOUT to REG valid
(MAX = 0.25 × B1 + 8.00)
CLKOUT to REG invalid
(MIN = 0.25 × B1 + 1.00)
CLKOUT to CE1, CE2 asserted
(MAX = 0.25 × B1 + 8.00)
CLKOUT to CE1, CE2 negated
(MAX = 0.25 × B1 + 8.00)
CLKOUT to PCOE, IORD, PCWE, IOWR
assert time (MAX = 0.00 × B1 + 11.00)
CLKOUT to PCOE, IORD, PCWE, IOWR
negate time (MAX = 0.00 × B1 + 11.00)
CLKOUT to ALE assert time
(MAX = 0.25 × B1 + 6.30)
CLKOUT to ALE negate time
(MAX = 0.25 × B1 + 8.00)
PCWE, IOWR negated to D(0:31)
invalid
WAITA and WAITB valid to CLKOUT
rising edge
CLKOUT rising edge to WAITA and
WAITB invalid
shows the PCMCIA timing for the MPC875/MPC870.
1
(MIN = 0.25 × B1 – 2.00)
1
(MIN = 0.75 × B1 – 2.00)
1
Characteristic
(MIN = 0.00 × B1 + 8.00)
1
(MIN = 0.00 × B1 + 2.00)
MPC875/MPC870 PowerQUICC™ Hardware Specifications, Rev. 4
1
Table 12. PCMCIA Timing
20.70
28.30
7.60
8.60
7.60
7.60
2.00
7.60
5.60
8.00
2.00
Min
—
—
33 MHz
15.60
15.60
15.60
11.00
11.00
13.80
15.60
Max
—
—
—
—
—
—
16.70
23.00
6.30
7.30
6.30
6.30
2.00
6.30
4.30
8.00
2.00
Min
—
—
40 MHz
14.30
14.30
14.30
11.00
11.00
12.50
14.30
Max
—
—
—
—
—
—
13.20
9.40
3.80
4.80
3.80
3.80
2.00
3.80
1.80
8.00
2.00
Min
—
—
66 MHz
11.80
11.80
11.80
11.00
11.00
10.00
11.80
Max
—
—
—
—
—
—
Freescale Semiconductor
10.50
4.125
1.125
7.40
3.13
3.13
3.13
2.00
3.13
8.00
2.00
Min
—
—
80 MHz
11.13
11.13
11.13
11.00
11.00
11.13
Max
9.40
—
—
—
—
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns