MPC885/MPC880 PowerQUICC Hardware Specifications, Rev. 7
Freescale Semiconductor 21
Bus Signal Timing
B29h WE(0:3) negated to D(0:31) High-Z GPCM write
access, TRLX = 1, CSNT = 1, EBDF = 1
(MIN = 0.375 ×B1 – 3.30)
38.40 — 31.10 — 17.50 — 13.85 — ns
B29i CS negated to D(0:31) High-Z GPCM write
access, TRLX = 1, CSNT = 1, ACS = 10 or
ACS = 11, EBDF = 1 (MIN = 0.375 ×B1–3.30)
38.40 — 31.10 — 17.50 — 13.85 — ns
B30 CS, WE(0:3) negated to A(0:31), BADDR(28:30)
Invalid GPCM read/write access8
(MIN = 0.25 ×B1 – 2.00)
5.60 — 4.30 — 1.80 — 1.13 — 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 (MIN = 0.50 ×B1 – 2.00)
13.20 — 10.50 — 5.60 — 4.25 — ns
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 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
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 (MIN = 0.375 ×B1–3.00)
8.40 — 6.40 — 2.70 — 1.70 — ns
B30d WE(0:3) negated to A(0:31), 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 11, EBDF = 1
38.67 — 31.38 — 17.83 — 14.19 — ns
B31 CLKOUT falling edge to CS valid, as requested by
control bit CST4 in the corresponding word in the
UPM (MAX = 0.00 ×B1 + 6.00)
1.50 6.00 1.50 6.00 1.50 6.00 1.50 6.00 ns
B31a CLKOUT falling edge to CS valid, as requested by
control bit CST1 in the corresponding word in the
UPM (MAX = 0.25 ×B1 + 6.80)
7.60 14.30 6.30 13.00 3.80 10.50 3.13 10.00 ns
B31b CLKOUT rising edge to CS valid, as requested by
control bit CST2 in the corresponding word in the
UPM (MAX = 0.00 ×B1 + 8.00)
1.50 8.00 1.50 8.00 1.50 8.00 1.50 8.00 ns
B31c CLKOUT rising edge to CS valid, as requested by
control bit CST3 in the corresponding word in the
UPM (MAX = 0.25 ×B1 + 6.30)
7.60 13.80 6.30 12.50 3.80 10.00 3.13 9.40 ns
B31d CLKOUT falling edge to CS valid, as requested by
control bit CST1 in the corresponding word in the
UPM EBDF = 1 (MAX = 0.375 ×B1 + 6.6)
13.30 18.00 11.30 16.00 7.60 12.30 4.69 11.30 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