參數(shù)資料
型號: XPC850ZT66BU
英文描述: Microprocessor
中文描述: 微處理器
文件頁數(shù): 36/76頁
文件大小: 825K
代理商: XPC850ZT66BU
36
MPC850 (Rev. A/B/C) Hardware Specifications
MOTOROLA
Layout Practices
Figure 6-24 provides the PCMCIA access cycle timing for the external bus read.
Figure 6-24. PCMCIA Access Cycles Timing External Bus Read
P53
CLKOUT to ALE negate time
13.00
16.00
14.00
0.250
ns
P54
PCWE, IOWR negated to D[0–31]
invalid.
1
3.00
6.00
4.00
0.250
ns
P55
WAIT_B valid to CLKOUT rising edge.
1
8.00
8.00
8.00
ns
P56
CLKOUT rising edge to WAIT_B invalid.
1
2.00
2.00
2.00
ns
1
PSST = 1. Otherwise add PSST times cycle time.
PSHT = 0. Otherwise add PSHT times cycle time.
These synchronous timings define when the WAIT_B signal is detected in order to freeze (or relieve) the PCMCIA
current cycle. The WAIT_B assertion will be effective only if it is detected 2 cycles before the PSL timer expiration.
See PCMCIA Interface in the MPC850 PowerQUICC User’s Manual.
Table 6-8. PCMCIA Timing (continued)
Num
Characteristic
50MHz
66MHz
80 MHz
FFACTOR
Unit
Min
Max
Min
Max
Min
Max
CLKOUT
A[6:31]
REG
CE1/CE2
PCOE, IORD
TS
D[0:31]
ALE
B19
B18
P53
P52
P52
P51
P50
P48
P49
P46
P45
P44
P47
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