Bus Signal Timing
Table 9. Bus Operation Timings (continued)
33 MHz 40 MHz
Min Max Min Max Min Max Min Max
66 MHz
80 MHz
Num
Characteristic
Unit
B29f WE(0:3) negated to D(0:31) High-Z GPCM 5.00
write access, TRLX = 0, CSNT = 1,
—
3.00
—
0.00
—
0.00
—
ns
EBDF = 1 (MIN = 0.375 × B1 – 6.30)
B29g CS negated to D(0:31) High-Z GPCM write 5.00
access, TRLX = 0, CSNT = 1 ACS = 10 or
ACS = 11, EBDF = 1
—
3.00
—
0.00
—
0.00
—
ns
(MIN = 0.375 × B1 – 6.30)
B29h WE(0:3) negated to D(0:31) High-Z GPCM 38.40
write access, TRLX = 1, CSNT = 1,
—
—
31.10
31.10
—
—
17.50
17.50
—
—
13.85
13.85
—
—
ns
ns
EBDF = 1 (MIN = 0.375 × B1 – 3.30)
B29i CS negated to D(0:31) High-Z GPCM write 38.40
access, TRLX = 1, CSNT = 1, ACS = 10 or
ACS = 11, EBDF = 1
(MIN = 0.375 × B1 – 3.30)
B30 CS, WE(0:3) negated to A(0:31),
BADDR(28:30) Invalid GPCM write
access 7 (MIN = 0.25 × B1 – .00)
5.60
—
—
4.30
—
—
1.80
5.60
—
—
1.13
4.25
—
—
ns
ns
B30a WE(0:3) negated to A(0:31),
BADDR(28:30) Invalid GPCM, write
access, TRLX = 0, CSNT = 1, CS negated
to A(0:31) invalid GPCM write access
TRLX = 0, CSNT =1 ACS = 10, or
ACS == 11, EBDF = 0
13.20
10.50
(MIN = 0.50 × B1 – 2.00)
B30b WE(0:3) negated to A(0:31) invalid GPCM 43.50
BADDR(28:30) invalid GPCM write
access, TRLX = 1, CSNT = 1. CS negated
to A(0:31) invalid GPCM write access
TRLX = 1, CSNT = 1, ACS = 10, or
ACS == 11 EBDF = 0
—
—
—
35.50
—
—
—
20.70
—
—
—
16.75
—
—
—
ns
ns
ns
(MIN = 1.50 × B1 – 2.00)
B30c WE(0:3) negated to A(0:31),
BADDR(28:30) invalid GPCM write
access, TRLX = 0, CSNT = 1. CS negated
to A(0:31) invalid GPCM write access,
TRLX = 0, CSNT = 1 ACS = 10,
ACS == 11, EBDF = 1
8.40
6.40
2.70
1.70
(MIN = 0.375 × B1 – 3.00)
B30d WE(0:3) negated to A(0:31),
BADDR(28:30) invalidGPCM writeaccess
TRLX = 1, CSNT =1, CS negated to
A(0:31) invalid GPCM write access
TRLX = 1, CSNT = 1, ACS = 10 or 11,
EBDF = 1
38.67
31.38
17.83
14.19
MPC885/MPC880 Hardware Specifications, Rev. 3
20
Freescale Semiconductor
FREESCALE [ Freescale ]
