
MPC885/MPC880 PowerQUICC Hardware Specifications, Rev. 7
20
Freescale Semiconductor
Bus Signal Timing
B27a
A(0:31) and BADDR(28:30) to CS asserted
GPCM ACS = 11, TRLX = 1
(MIN = 1.50
× B1 – 2.00)
43.50
—
35.50
—
20.70
—
16.75
—
ns
B28
CLKOUT rising edge to WE(0:3) negated GPCM
write access CSNT = 0 (MAX = 0.00
× B1 + 9.00)
—
9.00
—
9.00
—
9.00
—
9.00
ns
B28a
CLKOUT falling edge to WE(0:3) negated GPCM
write access TRLX = 0, CSNT = 1, EBDF = 0
(MAX = 0.25
× B1 + 6.80)
7.60
14.30
6.30
13.00
3.80
10.50
3.13
9.93
ns
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
ns
B28c
CLKOUT falling edge to WE(0:3) negated GPCM
write access TRLX = 0, CSNT = 1 write access
TRLX = 0, CSNT = 1, EBDF = 1
(MAX = 0.375
× B1 + 6.6)
10.90 18.00 10.90 18.00
5.20
12.30
4.69
11.29
ns
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 write
access, CSNT = 0, EBDF = 0
(MIN = 0.25
× B1 – 2.00)
5.60
—
4.30
—
1.80
—
1.13
—
ns
B29a
WE(0:3) negated to D(0:31) High-Z GPCM write
access, TRLX = 0, CSNT = 1, EBDF = 0
(MIN = 0.50
× B1 – 2.00)
13.20
—
10.50
—
5.60
—
4.25
—
ns
B29b
CS negated to D(0:31) High-Z GPCM write
access, ACS = 00, TRLX = 0 & CSNT = 0
(MIN = 0.25
× B1 – 2.00)
5.60
—
4.30
—
1.80
—
1.13
—
ns
B29c
CS negated to D(0:31) High-Z GPCM write
access, TRLX = 0, CSNT = 1, ACS = 10, or
ACS = 11 EBDF = 0 (MIN = 0.50
× B1–2.00)
13.20
—
10.50
—
5.60
—
4.25
—
ns
B29d
WE(0:3) negated to D(0:31) High-Z GPCM write
access, TRLX = 1, CSNT = 1, EBDF = 0
(MIN = 1.50
× B1 – 2.00)
43.50
—
35.50
—
20.70
—
16.75
—
ns
B29e
CS negated to D(0:31) High-Z GPCM write
access, TRLX = 1, CSNT = 1, ACS = 10, or
ACS = 11 EBDF = 0 (MIN = 1.50
× B1–2.00)
43.50
—
35.50
—
20.70
—
16.75
—
ns
B29f
WE(0:3) negated to D(0:31) High-Z GPCM write
access, TRLX = 0, CSNT = 1, EBDF = 1
(MIN = 0.375
× B1 – 6.30)7
5.00
—
3.00
—
0.00
—
0.00
—
ns
B29g
CS negated to D(0:31) High-Z GPCM write
access, TRLX = 0, CSNT = 1 ACS = 10 or
ACS = 11, EBDF = 1 (MIN = 0.375
× B1–6.30)7
5.00
—
3.00
—
0.00
—
0.00
—
ns
Table 9. Bus Operation Timings (continued)
Num
Characteristic
33 MHz
40 MHz
66 MHz
80 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max