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MPC8275VR 数据表(PDF) 24 Page - Motorola, Inc

部件名 MPC8275VR
功能描述  PowerQUICC II Family Hardware Specifications
PDF  76 Pages
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制造商  MOTOROLA [Motorola, Inc]
网页  http://www.freescale.com
标志 MOTOROLA - Motorola, Inc

MPC8275VR 数据表(HTML) 24 Page - Motorola, Inc

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MPC8280 PowerQUICC II™ Family Hardware Specifications
MOTOROLA
Clock Configuration Modes
In each clocking mode, the configuration of bus, core, PCI, and CPM frequencies is determined by seven
bits during the power-up reset—three hardware configuration pins (MODCK[1–3]) and four bits from
hardware configuration word[28–31] (MODCK_H). Both the PLLs and the dividers are set according to the
selected MPC8280 clock operation mode as described in the following sections.
7.1
Local Bus Mode
Table 15 lists clock configurations for the MPC8280 in local bus mode. The frequencies listed 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.
NOTE
Clock configurations change only after PORESET is asserted.
Table 15. Clock Configurations for Local Bus Mode1
Mode2
Bus Clock3
(MHz)
CPM
Multiplication
Factor4
CPM Clock
(MHz)
CPU
Multiplication
Factor5
CPU Clock
(MHz)
MODCK_H-MODCK[1-3]
low
high
low
high
low
high
Default Modes (MODCK_H= 0000)
0000_000
62.5
133.3
3
187.5
400.0
4
250.0
533.3
0000_001
50.0
133.3
3
150.0
400.0
5
250.0
666.7
0000_010
62.5
100.0
4
250.0
400.0
4
250.0
400.0
0000_011
50.0
100.0
4
200.0
400.0
5
250.0
500.0
0000_100
66.7
167.0
2
133.3
334.0
2.5
166.7
417.5
0000_101
66.7
167.0
2
133.3
334.0
3
200.0
501.0
0000_110
66.7
160.0
2.5
166.7
400.0
2.5
166.7
400.0
0000_111
55.5
160.0
2.5
138.7
400.0
3
166.7
480.0
Full Configuration Modes
0001_000
66.7
167.0
2
133.3
334.0
4
266.7
668.0
0001_001
66.7
167.0
2
133.3
334.0
5
333.3
835.0
0001_010
66.7
167.0
2
133.3
334.0
6
396.0
1002.0
0001_011
Reserved
0001_100
Reserved
0001_101
62.5
133.3
3
187.5
400.0
4
250.0
533.3
0001_110
50.0
133.3
3
150.0
400.0
5
250.0
666.7
1000_111
45.5
133.3
3
136.4
400.0
5.5
250.0
733.3
0001_111
44.3
133.3
3
133.3
400.0
6
266.7
800.0
0010_000
Reserved
0010_001
Reserved



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