Bus Signal Timing
The timing for the MPC860 bus shown assumes a 50-pF load for maximum delays and a
0-pF load for minimum delays.
Table 9-6. Bus Operation Timings
33 MHz
Min Max
30.30 30.30 25.00 30.30 20.00 30.30 15.15 30.30 ns
40 MHz
50 MHz
66 MHz
Num
Characteristic
Unit
Min Max
Min Max
Min Max
B1 CLKOUT period
B1a EXTCLK to CLKOUT phase skew
(EXTCLK > 15 MHz and MF <= 2)
–0.90 0.90 –0.90 0.90 –0.90 0.90 –0.90 0.90
–2.30 2.30 –2.30 2.30 –2.30 2.30 –2.30 2.30
–0.60 0.60 –0.60 0.60 –0.60 0.60 –0.60 0.60
–2.00 2.00 –2.00 2.00 –2.00 2.00 –2.00 2.00
ns
ns
ns
B1b EXTCLK to CLKOUT phase skew
(EXTCLK > 10 MHz and MF < 10)
B1c CLKOUT phase jitter (EXTCLK >
1
15 MHz and MF <= 2)
1
B1d CLKOUT phase jitter
ns
%
%
1
B1e CLKOUT frequency jitter (MF < 10)
B1f CLKOUT frequency jitter (10 < MF
—
—
0.50
2.00
—
—
0.50
2.00
—
—
0.50
2.00
—
—
0.50
2.00
1
< 500)
1
B1g CLKOUT frequency jitter (MF > 500)
—
—
3.00
0.50
—
—
—
3.00
0.50
—
—
—
3.00
0.50
—
—
—
3.00
0.50
—
%
%
2
B1h Frequency jitter on EXTCLK
B2 CLKOUT pulse width low
B3 CLKOUT width high
12.12
12.12
—
10.00
10.00
—
8.00
8.00
—
6.06
6.06
—
ns
ns
ns
ns
ns
—
—
—
—
3
B4 CLKOUT rise time
4.00
4.00
—
4.00
4.00
—
4.00
4.00
—
4.00
4.00
—
33
3
B5
CLKOUT fall time
—
—
—
—
B7 CLKOUT to A(0:31), BADDR(28:30), 7.58
RD/WR, BURST, D(0:31), DP(0:3)
invalid
6.25
5.00
3.80
B7a CLKOUT to TSIZ(0:1), REG, RSV,
AT(0:3), BDIP, PTR invalid
7.58
—
—
6.25
6.25
—
—
5.00
5.00
—
—
3.80
3.80
—
—
ns
ns
B7b CLKOUT to BR, BG, FRZ,VFLS(0:1), 7.58
VF(0:2) IWP(0:2), LWP(0:1), STS
4
invalid
B8 CLKOUT to A(0:31), BADDR(28:30)
RD/WR, BURST, D(0:31), DP(0:3)
valid
7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.04 ns
B8a CLKOUT to TSIZ(0:1), REG, RSV,
AT(0:3) BDIP, PTR valid
7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.04 ns
7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.04 ns
B8b CLKOUT to BR, BG, VFLS(0:1),
VF(0:2), IWP(0:2), FRZ, LWP(0:1),
4
STS valid
B9 CLKOUT to A(0:31), BADDR(28:30), 7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.04 ns
RD/WR, BURST, D(0:31), DP(0:3),
TSIZ(0:1), REG, RSV, AT(0:3), PTR
High-Z
14
MPC860 Family Hardware Specifications
MOTOROLA
MOTOROLA [ MOTOROLA ]
