參數(shù)資料
型號(hào): MPC870
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Hardware Specifications
中文描述: 硬件規(guī)格
文件頁數(shù): 31/84頁
文件大小: 1366K
代理商: MPC870
MPC875/MPC870 Hardware Specifications, Rev. 3.0
37
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Freescale Semiconductor
Bus Signal Timing
Table 12 shows the PCMCIA timing for the MPC875/870.
Table 12. PCMCIA Timing
Num
Characteristic
33 MHz
40 MHz
66 MHz
80 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max
P44
A(0:31), REG valid to PCMCIA
strobe asserted 1
(MIN = 0.75
× B1 – 2.00)
1 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 User’s Manual.
20.70
16.70
9.40
7.40
ns
P45
A(0:31), REG valid to ALE
negation1
(MIN = 1.00
× B1 – 2.00)
28.30
23.00
13.20
10.50
ns
P46
CLKOUT to REG valid
(MAX = 0.25
× B1 + 8.00)
7.60
15.60
6.30
14.30
3.80
11.80
3.13
11.13
ns
P47
CLKOUT to REG invalid
(MIN = 0.25
× B1 + 1.00)
8.60
7.30
4.80
4.125
ns
P48
CLKOUT to CE1, CE2 asserted
(MAX = 0.25
× B1 + 8.00)
7.60
15.60
6.30
14.30
3.80
11.80
3.13
11.13
ns
P49
CLKOUT to CE1, CE2 negated
(MAX = 0.25
× B1 + 8.00)
7.60
15.60
6.30
14.30
3.80
11.80
3.13
11.13
ns
P50
CLKOUT to PCOE, IORD, PCWE,
IOWR assert time (MAX =
0.00
× B1 + 11.00)
11.00
11.00
11.00
11.00
ns
P51
CLKOUT to PCOE, IORD, PCWE,
IOWR negate time (MAX =
0.00
× B1 + 11.00)
2.00
11.00
2.00
11.00
2.00
11.00
2.00
11.00
ns
P52
CLKOUT to ALE assert time (MAX
= 0.25
× B1 + 6.30)
7.60
13.80
6.30
12.50
3.80
10.00
3.13
9.40
ns
P53
CLKOUT to ALE negate time (MAX
= 0.25
× B1 + 8.00)
15.60
14.30
11.80
11.13
ns
P54
PCWE, IOWR negated to D(0:31)
invalid1(MIN – = 0.25
× B1 – 2.00)
5.60
4.30
1.80
1.125
ns
P55
WAITA and WAITB valid to
CLKOUT rising edge1
(MIN = 0.00
× B1 + 8.00)
8.00
8.00
8.00
8.00
ns
P56
CLKOUT rising edge to WAITA and
WAITB invalid1 (MIN = 0.00
× B1 +
2.00)
2.00
2.00
2.00
2.00
ns
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