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
B27 A(0:31) and BADDR(28:30) to CS
asserted GPCM ACS = 10, TRLX = 1
(MIN = 1.25 × B1 – 2.00)
35.90
43.50
—
—
29.30
35.50
—
—
16.90
20.70
—
—
13.60
16.75
—
—
ns
B27a A(0:31) and BADDR(28:30) to CS
asserted GPCM ACS = 11, TRLX = 1
(MIN = 1.50 × B1 – 2.00)
—
—
—
—
ns
ns
ns
ns
B28 CLKOUT rising edge to WE(0:3) negated
GPCM write access CSNT = 0
9.00
9.00
9.00
9.00
(MAX = 0.00 × B1 + 9.00)
B28a CLKOUT falling edge to WE(0:3) negated 7.60 14.30 6.30 13.00 3.80 10.50 3.13 9.93
GPCM write access TRLX = 0, CSNT = 1,
EBDF = 0 (MAX = 0.25 × B1 + 6.80)
B28b CLKOUT falling edge to CS negated
GPCM write access TRLX = 0, CSNT = 1
ACS = 10 or ACS = 11, EBDF = 0
(MAX = 0.25 × B1 + 6.80)
—
14.30
—
13.00
—
10.50
—
9.93
B28c CLKOUT falling edge to WE(0:3) negated 10.90 18.00 10.90 18.00 5.20 12.30 4.69 11.29 ns
GPCM write access TRLX = 0, CSNT = 1
write access TRLX = 0, CSNT = 1,
EBDF = 1 (MAX = 0.375 × B1 + 6.6)
B28d CLKOUT falling edge to CS negated
GPCM write access TRLX = 0, CSNT = 1,
ACS = 10, or ACS = 11, EBDF = 1
(MAX = 0.375 × B1 + 6.6)
—
18.00
—
18.00
—
12.30
—
11.30 ns
B29 WE(0:3) negated to D(0:31) High-Z GPCM 5.60
write access, CSNT = 0, EBDF = 0
—
—
—
—
4.30
10.50
4.30
—
—
—
—
1.80
5.60
1.80
5.60
—
—
—
—
1.13
4.25
1.13
4.25
—
—
—
—
ns
ns
ns
ns
(MIN = 0.25 × B1 – 2.00)
B29a WE(0:3) negated to D(0:31) High-Z GPCM 13.20
write access, TRLX = 0, CSNT = 1,
EBDF = 0 (MIN = 0.50 × B1 – 2.00)
B29b CS negated to D(0:31) High-Z GPCM write 5.60
access, ACS = 00, TRLX = 0 & CSNT = 0
(MIN = 0.25 × B1 – 2.00)
B29c CS negated to D(0:31) High-Z GPCM write 13.20
access, TRLX = 0, CSNT = 1, ACS = 10,
or ACS = 11 EBDF = 0
10.50
(MIN = 0.50 × B1 – 2.00)
B29d WE(0:3) negated to D(0:31) High-Z GPCM 43.50
write access, TRLX = 1, CSNT = 1,
—
—
35.50
35.50
—
—
20.70
20.70
—
—
16.75
16.75
—
—
ns
ns
EBDF = 0 (MIN = 1.50 × B1 – 2.00)
B29e CS negated to D(0:31) High-Z GPCM write 43.50
access, TRLX = 1, CSNT = 1, ACS = 10,
or ACS = 11 EBDF = 0
(MIN = 1.50 × B1 – 2.00)
MPC885/MPC880 Hardware Specifications, Rev. 3
19
Freescale Semiconductor
FREESCALE [ Freescale ]
