MPC8270 MOTOROLA [Motorola, Inc], MPC8270 Datasheet - Page 37

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

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2
3
4
5
MOTOROLA
MODCK[1-3]
As shown in Table 14, PCI_MODCK determines the PCI clock frequency range. Refer to Table 19 for lower
MODCK_H = hard reset configuration word [28–31]. MODCK[1-3] = three hardware configuration pins.
CPM multiplication factor = CPM clock/PCI clock
CPU multiplication factor = Core PLL multiplication factor
MODCK_H-
“Low” values are the minimum allowable frequencies for a given clock mode. The minimum bus frequency guarantees
the required minimum CPU operating frequency. Minimum CPU frequency is determined by the clock mode.
For modes with a CPU multiplication factor ≤ 3, the minimum CPU frequency is 166 MHz. The minimum CPM frequency
is 133 MHz.
For modes with a CPU multiplication factor ≥ 3.5, the minimum CPU frequency is 250 MHz. The minimum CPM
frequency is as shown in the table.
“High” values are for the purpose of illustration only. Users must select a mode and input bus frequency so that the
resulting configuration does not exceed the frequency rating of the user’s device.
configurations.
1100_110
1100_111
1101_000
1101_001
1101_010
1101_011
1101_100
1110_000
1110_001
1110_010
1110_011
1110_100
1110_101
1110_110
1110_111
1100_000
1100_001
1100_010
Mode
Table 18. Clock Configurations for PCI Agent Mode (PCI_MODCK=0)
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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
50.0 66.7
50.0 66.7
50.0 66.7
PCI Clock
low high
(MHz)
MPC8280 PowerQUICC II™ Family Hardware Specifications
Multiplication
Factor
CPM
6
6
6
6
6
6
6
5
5
5
5
5
5
5
5
4
300.0 400.0
300.0 400.0
300.0 400.0
300.0 400.0
300.0 400.0
300.0 400.0
300.0 400.0
250.0 333.3
250.0 333.3
250.0 333.3
250.0 333.3
250.0 333.3
250.0 333.3
250.0 333.3
250.0 333.3
CPM Clock
low
(MHz)
high
Multiplication
Reserved
Reserved
Reserved
Factor
CPU
4.5
5.5
3.5
4.5
2.5
3.5
4.5
5.5
5
4
5
3
4
4
5
5
450.0 599.9
500.0 666.6
550.0 733.3
420.0 559.9
480.0 639.9
540.0 719.9
600.0 799.9
312.5 416.6
375.0 500.0
437.5 583.3
500.0 666.6
333.3 444.4
375.0 500.0
416.7 555.5
458.3 611.1
CPU Clock
low
(MHz)
high
Clock Configuration Modes
1,2
Division
Factor
(Continued)
Bus
2.5
2.5
2.5
2.5
3
3
3
2
2
2
2
3
3
3
3
100.0 133.3
100.0 133.3
100.0 133.3
120.0 160.0
120.0 160.0
120.0 160.0
120.0 160.0
125.0 166.7
125.0 166.7
125.0 166.7
125.0 166.7
83.3 111.1
83.3 111.1
83.3 111.1
83.3 111.1
Bus Clock
low
(MHz)
high
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