mpc850de Freescale Semiconductor, Inc, mpc850de Datasheet - Page 13

• Manufacturer Part Number: mpc850de
• Description: Mpc850 Rev. A/b/c Communications Controller
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
B22c CLKOUT falling edge to CS
B24a A[6–31] to CS asserted GPCM
B27a A[6–31] to CS asserted GPCM
B28a CLKOUT falling edge to WE[0–3]
B28b CLKOUT falling edge to CS
B28c CLKOUT falling edge to WE[0–3]
B28d CLKOUT falling edge to CS
B29a WE[0–3] negated to D[0–31],
Num
B23
B24
B25
B26
B27
B28
B29
asserted GPCM ACS = 11, TRLX
= 0, EBDF = 1
CLKOUT rising edge to CS
negated GPCM read access,
GPCM write access ACS = 00,
TRLX = 0 & CSNT = 0
A[6–31] to CS asserted GPCM
ACS = 10, TRLX = 0.
ACS = 11, TRLX = 0
CLKOUT rising edge to OE,
WE[0–3] asserted
CLKOUT rising edge to OE
negated
A[6–31] to CS asserted GPCM
ACS = 10, TRLX = 1
ACS = 11, TRLX = 1
CLKOUT rising edge to WE[0–3]
negated GPCM write access
CSNT = 0
negated GPCM write access
TRLX = 0,1 CSNT = 1, EBDF = 0
negated GPCM write access
TRLX = 0,1 CSNT = 1, ACS = 10
or ACS = 11, EBDF = 0
negated GPCM write access
TRLX = 0,1 CSNT = 1 write
access TRLX = 0, CSNT = 1,
EBDF = 1
negated GPCM write access
TRLX = 0,1 CSNT = 1, ACS = 10
or ACS = 11, EBDF = 1
WE[0–3] negated to D[0–31],
DP[0–3] high-Z GPCM write
access, CSNT = 0
DP[0–3] high-Z GPCM write
access, TRLX = 0 CSNT = 1,
EBDF = 0
Characteristic
MPC850 (Rev. A/B/C) Hardware Specifications
Table 6. Bus Operation Timing
23.00
28.00
7.00
2.00
3.00
8.00
2.00
5.00
7.00
3.00
8.00
Min
—
—
—
—
50 MHz
14.00 11.00 18.00
12.00
12.00
14.00 11.00 18.00
14.00
Max
8.00
9.00
9.00
9.00
—
—
—
—
—
—
13.00
36.00
43.00
13.00
2.00
6.00
2.00
8.00
6.00
Min
—
—
—
—
66 MHz
14.00
14.00
18.00
Max
8.00
9.00
9.00
9.00
—
—
—
—
—
—
1
(continued)
11.00
29.00
36.00
11.00
9.00
2.00
4.00
2.00
6.00
9.00
4.00
Min
—
—
—
—
80 MHz
16.00
13.00
13.00
16.00
16.00
Max
8.00
9.00
9.00
9.00
—
—
—
—
—
—
FFACT
0.375
0.250
0.500
1.250
1.500
0.250
0.250
0.375
0.375
0.250
0.500
—
—
—
—
Layout Practices
Cap Load
(default
50 pF)
50.00
50.00
50.00
50.00
50.00
50.00
50.00
50.00
50.00
50.00
50.00
50.00
50.00
50.00
50.00
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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