MPC870 FREESCALE [Freescale Semiconductor, Inc], MPC870 Datasheet - Page 37

• Manufacturer Part Number: MPC870
• Description: Hardware Specifications
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Bus Signal Timing
Table 12
37
1
PSST = 1. Otherwise add PSST times cycle time.
Num
P44
P45
P46
P47
P48
P49
P50
P51
P52
P53
P54
P55
P56
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 User’s Manual.
shows the PCMCIA timing for the MPC875/870.
A(0:31), REG valid to PCMCIA
strobe asserted
(MIN = 0.75 × B1 – 2.00)
A(0:31), REG valid to ALE
negation
(MIN = 1.00
CLKOUT to REG valid
(MAX = 0.25
CLKOUT to REG invalid
(MIN = 0.25
CLKOUT to CE1, CE2 asserted
(MAX = 0.25
CLKOUT to CE1, CE2 negated
(MAX = 0.25
CLKOUT to PCOE, IORD, PCWE,
IOWR assert time (MAX =
0.00
CLKOUT to PCOE, IORD, PCWE,
IOWR negate time (MAX =
0.00
CLKOUT to ALE assert time (MAX
= 0.25
CLKOUT to ALE negate time (MAX
= 0.25
PCWE, IOWR negated to D(0:31)
invalid
WAITA and WAITB valid to
CLKOUT rising edge
(MIN = 0.00
CLKOUT rising edge to WAITA and
WAITB invalid
2.00)
×
×
1
B1 + 11.00)
B1 + 11.00)
×
×
(MIN – = 0.25
1
B1 + 6.30)
B1 + 8.00)
Characteristic
×
×
×
×
×
×
1
B1 – 2.00)
B1 + 1.00)
B1 + 8.00)
(MIN = 0.00
B1 + 8.00)
B1 + 8.00)
B1 + 8.00)
1
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
1
MPC875/MPC870 Hardware Specifications, Rev. 3.0
×
B1 – 2.00)
×
B1 +
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
12.50
14.30
11.00
11.00
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
10.00
11.80
11.80
11.80
11.00
11.00
11.80
Max
—
—
—
—
—
—
10.50
4.125
1.125
7.40
3.13
3.13
3.13
2.00
3.13
8.00
2.00
Min
Freescale Semiconductor
—
—
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