Bus Signal Timing
Table 9-6. Bus Operation Timings (continued)
33 MHz
40 MHz
50 MHz
66 MHz
Unit
Num
Characteristic
Min
Max
Min
Max
Min
Max
Min
Max
B29b CS negated to D(0:31), DP(0:3),
High-Z GPCM write access,
5.58
—
4.25
—
3.00
—
1.79
—
ns
ns
ACS = 00, TRLX = 0, and CSNT = 0
B29c CS negated to D(0:31), DP(0:3)
High-Z GPCM write access,
TRLX = 0, CSNT = 1, ACS = 10, or
ACS = 11, EBDF = 0
13.15
—
10.5
—
8.00
—
5.58
—
B29d WE(0:3) negated to D(0:31), DP(0:3) 43.45
High-Z GPCM write access,
—
—
35.5
35.5
—
—
28.00
28.00
—
—
20.73
29.73
—
—
ns
ns
TRLX = 1, CSNT = 1, EBDF = 0
B29e CS negated to D(0:31), DP(0:3)
High-Z GPCM write access,
TRLX = 1, CSNT = 1, ACS = 10, or
ACS = 11, EBDF = 0
43.45
B29f WE(0:3) negated to D(0:31), DP(0:3) 8.86
High-Z GPCM write access,
—
—
6.88
6.88
—
—
5.00
5.00
—
—
3.18
3.18
—
—
ns
ns
TRLX = 0, CSNT = 1, EBDF = 1
B29g CS negated to D(0:31), DP(0:3)
High-Z GPCM write access,
TRLX = 0, CSNT = 1, ACS = 10, or
ACS = 11, EBDF = 1
8.86
B29h WE(0:3) negated to D(0:31), DP(0:3) 38.67
High-Z GPCM write access,
—
—
31.38
31.38
—
—
24.50
24.50
—
—
17.83
17.83
—
—
ns
ns
TRLX = 1, CSNT = 1, EBDF = 1
B29i CS negated to D(0:31), DP(0:3)
High-Z GPCM write access,
TRLX = 1, CSNT = 1, ACS = 10, or
ACS = 11, EBDF = 1
38.67
B30 CS, WE(0:3) negated to A(0:31),
BADDR(28:30) invalid GPCM write
5.58
—
—
4.25
—
—
3.00
8.00
—
—
1.79
5.58
—
—
ns
ns
8
access
B30a WE(0:3) negated to A(0:31),
BADDR(28:30) invalid GPCM, write
access, TRLX = 0, CSNT = 1,
13.15
10.50
CS negated to A(0:31) invalid GPCM
write access, TRLX = 0, CSNT =1
ACS = 10, or ACS = 11, EBDF = 0
B30b WE(0:3) negated to A(0:31),
invalid GPCM BADDR(28:30) invalid
GPCM write access, TRLX = 1,
CSNT = 1. CS negated to A(0:31),
Invalid GPCM, write access,
43.45
—
35.50
—
28.00
—
20.73
—
ns
TRLX = 1, CSNT = 1, ACS = 10, or
ACS = 11, EBDF = 0
MOTOROLA
MPC860 Family Hardware Specifications
17
MOTOROLA [ MOTOROLA ]
