Layout Practices
1
Table 6-6. Bus Operation Timing
(continued)
50 MHz
66 MHz
80 MHz
Cap Load
(default
50 pF)
Num
Characteristic
FFACT
Unit
Min
Max
Min
Max
Min
Max
B19 CLKOUT rising edge to D[0–31], 1.00
—
1.00
4.00
—
1.00
4.00
—
—
—
50.00
ns
ns
7
DP[0–3] valid (hold time)
B20 D[0–31], DP[0–3] valid to
CLKOUT falling edge (setup
4.00
2.00
—
—
—
—
—
—
50.00
8
time)
B21 CLKOUT falling edge to
D[0–31], DP[0–3] valid (hold
2.00
2.00
—
—
—
8
time)
B22 CLKOUT rising edge to CS
asserted GPCM ACS = 00
5.00 11.75 7.58 14.33 6.25 13.00 0.250
8.00 8.00 8.00
50.00
50.00
ns
ns
B22a CLKOUT falling edge to CS
asserted GPCM ACS = 10,
TRLX = 0,1
—
—
—
—
B22b CLKOUT falling edge to CS
asserted GPCM ACS = 11,
TRLX = 0, EBDF = 0
5.00 11.75 7.58 14.33 6.25 13.00 0.250
7.00 14.00 11.00 18.00 9.00 16.00 0.375
50.00
50.00
50.00
ns
ns
ns
B22c CLKOUT falling edge to CS
asserted GPCM ACS = 11,
TRLX = 0, EBDF = 1
B23 CLKOUT rising edge to CS
negated GPCM read access,
GPCM write access ACS = 00,
TRLX = 0 & CSNT = 0
2.00 8.00 2.00 8.00 2.00 8.00
—
B24 A[6–31] to CS asserted GPCM 3.00
ACS = 10, TRLX = 0.
—
—
6.00
13.00
—
—
—
4.00
11.00
—
—
—
0.250
0.500
—
50.00
50.00
50.00
50.00
50.00
50.00
50.00
ns
ns
ns
ns
ns
ns
ns
B24a A[6–31] to CS asserted GPCM 8.00
ACS = 11, TRLX = 0
B25 CLKOUT rising edge to OE,
WE[0–3] asserted
—
9.00
9.00
9.00
B26 CLKOUT rising edge to OE
negated
2.00 9.00 2.00 9.00 2.00 9.00
—
B27 A[6–31] to CS asserted GPCM 23.00
ACS = 10, TRLX = 1
—
—
36.00
43.00
—
—
—
29.00
36.00
—
—
—
1.250
1.500
—
B27a A[6–31] to CS asserted GPCM 28.00
ACS = 11, TRLX = 1
B28 CLKOUT rising edge toWE[0–3]
negated GPCM write access
CSNT = 0
—
9.00
9.00
9.00
B28a CLKOUT falling edge to
WE[0–3] negated GPCM write
access TRLX = 0,1 CSNT = 1,
EBDF = 0
5.00 12.00 8.00 14.00 6.00 13.00 0.250
50.00
ns
14
MPC850 (Rev.A/B/C) Hardware Specifications
MOTOROLA
MOTOROLA [ MOTOROLA ]
