Bus Signal Timing
Table 10. Bus Operation Timings (continued)
33 MHz 40 MHz 66 MHz
Min Max Min Max Min Max Min Max
9.00 9.00 9.00 9.00
80 MHz
Num
Characteristic
Unit
B28 CLKOUT rising edge to
—
—
—
—
ns
WE(0:3)/BS_B[0:3] negated GPCM write
access CSNT = 0
(MAX = 0.00 × B1 + 9.00)
B28a CLKOUT falling edge to
WE(0:3)/BS_B[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
ns
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
11.29
B28c CLKOUT falling edge to
WE(0:3)/BS_B[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
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)/BS_B[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
5.60
—
—
1.13
4.25
—
—
ns
ns
B29a WE(0:3)/BS_B[0:3] negated to D(0:31)
High-Z GPCM write access, TRLX = 0,
CSNT = 1, EBDF = 0
13.20
10.50
(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
—
—
4.30
—
—
1.80
5.60
—
—
1.13
4.25
—
—
ns
ns
10.50
(MIN = 0.50 × B1 – 2.00)
B29d WE(0:3)/BS_B[0:3] negated to D(0:31)
High-Z GPCM write access, TRLX = 1,
CSNT = 1, EBDF = 0
43.50
—
—
35.50
35.50
—
—
20.70
20.70
—
—
16.75
16.75
—
—
ns
ns
(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)
MPC875/MPC870 Hardware Specifications, Rev. 3.0
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
19
Freescale Semiconductor
FREESCALE [ Freescale ]
