MPC8270 MOTOROLA [Motorola, Inc], MPC8270 Datasheet - Page 27

• Manufacturer Part Number: MPC8270
• Description: PowerQUICC II Family Hardware Specifications
• Manufacturer: MOTOROLA [Motorola, Inc]

MOTOROLA
MODCK[1-3]
MODCK_H-
0000_000
0000_001
0000_010
0000_011
0000_100
0000_101
0000_110
0000_111
0001_000
0001_001
0001_010
0001_011
0010_000
0010_001
0010_010
0010_011
0010_100
0010_101
0010_110
0011_000
Mode
3
Bus Clock
66.7
66.7
55.5
71.4
62.5
55.5
62.5
50.0
50.0
50.0
50.0
50.0
50.0
50.0
50.0
75.0 100.0
75.0 100.0
75.0 100.0
50.0
low
Table 16. Clock Configurations for PCI Host Mode (PCI_MODCK=0)
In PCI mode only, PCI_MODCK comes from the LGPL5 pin and
MODCK_H[0–3] comes from {LGPL0, LGPL1, LGPL2, LGPL3}.
The minimum Tval = 2 when PCI_MODCK = 1, and the minimum
Tval = 1 when PCI_MODCK = 0. Therefore, designers should use clock
configurations that fit this condition to achieve PCI-compliant AC timing.
(MHz)
MPC8280 PowerQUICC II™ Family Hardware Specifications
high
66.7
66.7
80.0
80.0
80.0
66.7
66.7
66.7
66.7
66.7
66.7
66.7
66.7
66.7
66.7
66.7
4
Multiplication
Factor
CPM
2.5
2.5
2.5
2
2
3
3
3
3
3
3
4
4
4
4
4
4
4
5
PCI host mode (PCI_MODCK=1) only (refer to Table 17)
5
Default Modes (MODCK_H=0000)
NOTE: Tval (Output Hold)
Full Configuration Modes
NOTE: PCI_MODCK
133.3 133.3
133.3 133.3
150.0 200.0
178.6 200.0
156.3 200.0
166.7 200.0
187.5 200.0
150.0 200.0
150.0 200.0
150.0 200.0
150.0 200.0
200.0 266.6
200.0 266.6
200.0 266.6
200.0 266.6
300.0 400.0
300.0 400.0
300.0 400.0
250.0 333.3
CPM Clock
low
(MHz)
high
Multiplication
Factor
CPU
2.5
3.5
5.5
3
3
4
3
4
5
6
7
8
5
6
7
8
5
6
5
6
166.7 166.7
200.0 200.0
166.7 240.0
250.0 280.0
250.0 320.0
166.7 200.0
250.0 266.6
250.0 333.3
300.0 400.0
350.0 466.6
400.0 533.3
250.0 333.3
300.0 400.0
350.0 466.6
400.0 533.3
375.0 500.0
412.5 549.9
450.0 599.9
250.0 333.3
CPU Clock
low
(MHz)
high
Clock Configuration Modes
Division
Factor
PCI
1,2
2
2
3
3
3
3
3
3
3
3
3
4
4
4
4
6
6
6
5
PCI Clock
66.7 66.7
66.7 66.7
50.0 66.7
59.5 66.7
52.1 66.7
55.5 66.7
62.5 66.7
50.0 66.7
50.0 66.7
50.0 66.7
50.0 66.7
50.0 66.7
50.0 66.7
50.0 66.7
50.0 66.7
50.0 66.7
50.0 66.7
50.0 66.7
50.0 66.7
low high
(MHz)
27