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MPC8280VRM 数据表(PDF) 31 Page - Freescale Semiconductor, Inc

部件名 MPC8280VRM
功能描述  PowerQUICC II??Family Hardware Specifications
PDF  80 Pages
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

MPC8280VRM 数据表(HTML) 31 Page - Freescale Semiconductor, Inc

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MPC8280 PowerQUICC II™ Family Hardware Specifications, Rev. 1.7
Freescale Semiconductor
31
Clock Configuration Modes
1101_000
100.0 133.3
2.5
250.0 333.3
3
300.0 400.0
5
50.0 66.7
1101_001
100.0 133.3
2.5
250.0 333.3
3.5
350.0 466.6
5
50.0 66.7
1101_010
100.0 133.3
2.5
250.0 333.3
4
400.0 533.3
5
50.0 66.7
1101_011
100.0 133.3
2.5
250.0 333.3
4.5
450.0 599.9
5
50.0 66.7
1101_100
100.0 133.3
2.5
250.0 333.3
5
500.0 666.6
5
50.0 66.7
1101_101
125.0 166.7
2
250.0 333.3
3
375.0 500.0
5
50.0 66.7
1101_110
125.0 166.7
2
250.0 333.3
4
500.0 666.6
5
50.0 66.7
1110_000
100.0 133.3
3
300.0 400.0
3.5
350.0 466.6
6
50.0 66.7
1110_001
100.0 133.3
3
300.0 400.0
4
400.0 533.3
6
50.0 66.7
1110_010
100.0 133.3
3
300.0 400.0
4.5
450.0 599.9
6
50.0 66.7
1110_011
100.0 133.3
3
300.0 400.0
5
500.0 666.6
6
50.0 66.7
1110_100
100.0 133.3
3
300.0 400.0
5.5
550.0 733.3
6
50.0 66.7
1100_000
Reserved
1100_001
Reserved
1100_010
Reserved
1
The “low” values are the minimum allowable frequencies for a given clock mode. The minimum bus frequency in a table
entry guarantees only the required minimum CPU operating frequency. The “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 violate
the frequency rating of the user’s device. The minimum CPM frequency is 120 MHz. Minimum CPU frequency is
determined by the clock mode. For modes with a CPU multiplication factor <= 3, the minimum CPU frequency is 150
MHz for commercial temperature devices and 175 MHz for extended temperature devices. For modes with a CPU
multiplication factor >= 3.5: for Rev0.1 the minimum CPU frequency is 250 MHz; for RevA or later the minimum CPU
frequency is 150 MHz for commercial temperature devices and 175 MHz for extended temperature devices.
2
As Table 15 shows, PCI_MODCK determines the PCI clock frequency range. Refer to Table 18 for lower configurations.
3
MODCK_H = hard reset configuration word [28–31]. MODCK[1-3] = three hardware configuration pins.
4
60x and local bus frequency. Identical to CLKIN.
5
CPM multiplication factor = CPM clock/bus clock
6
CPU multiplication factor = Core PLL multiplication factor
Table 17. Clock Configurations for PCI Host Mode (PCI_MODCK=0) 1, 2 (continued)
Mode 3
Bus Clock 4
(MHz)
CPM
Multiplication
Factor 5
CPM Clock
(MHz)
CPU
Multiplication
Factor 6
CPU Clock
(MHz)
PCI
Division
Factor
PCI Clock
(MHz)
MODCK_H-
MODCK[1-3]
Low
High
Low
High
Low
High
Low High



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