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MPC8280VRT 数据表(PDF) 28 Page - Freescale Semiconductor, Inc

部件名 MPC8280VRT
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

MPC8280VRT 数据表(HTML) 28 Page - Freescale Semiconductor, Inc

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MPC8280 PowerQUICC II™ Family Hardware Specifications, Rev. 1.7
28
Freescale Semiconductor
Clock Configuration Modes
7.2 PCI Host Mode
Table 17 and Table 18 show clock configurations for PCI host 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. In addition, note the following:
NOTE: PCI_MODCK
In PCI mode only, PCI_MODCK comes from the LGPL5 pin and
MODCK_H[0–3] comes from {LGPL0, LGPL1, LGPL2, LGPL3}.
NOTE: Tval (Output Hold)
The minimum Tval = 2 ns when PCI_MODCK = 1, and the minimum Tval = 1 ns
when PCI_MODCK = 0. Therefore, designers should use clock configurations that
fit this condition to achieve PCI-compliant AC timing.
Table 17. Clock Configurations for PCI Host Mode (PCI_MODCK=0) 1, 2
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
Default Modes (MODCK_H=0000)
0000_000
60.0
66.7
2
120.0 133.3
2.5
150.0 166.7
2
60.0 66.7
0000_001
50.0
66.7
2
100.0 133.3
3
150.0 200.0
2
50.0 66.7
0000_010
60.0
80.0
2.5
150.0 200.0
3
180.0 240.0
3
50.0 66.7
0000_011
60.0
80.0
2.5
150.0 200.0
3.5
210.0 280.0
3
50.0 66.7
0000_100
60.0
80.0
2.5
150.0 200.0
4
240.0 320.0
3
50.0 66.7
0000_101
50.0
66.7
3
150.0 200.0
3
150.0 200.0
3
50.0 66.7
0000_110
50.0
66.7
3.5
150.0 200.0
3.5
175.0 233.3
3
50.0 66.7
0000_111
50.0
66.7
3
150.0 200.0
4
200.0 266.6
3
50.0 66.7
Full Configuration Modes
0001_000
50.0
66.7
3
150.0 200.0
5
250.0 333.3
3
50.0 66.7
0001_001
50.0
66.7
3
150.0 200.0
6
300.0 400.0
3
50.0 66.7
0001_010
50.0
66.7
3
150.0 200.0
7
350.0 466.6
3
50.0 66.7
0001_011
50.0
66.7
3
150.0 200.0
8
400.0 533.3
3
50.0 66.7
0010_000
50.0
66.7
4
200.0 266.6
5
250.0 333.3
4
50.0 66.7
0010_001
50.0
66.7
4
200.0 266.6
6
300.0 400.0
4
50.0 66.7
0010_010
50.0
66.7
4
200.0 266.6
7
350.0 466.6
4
50.0 66.7
0010_011
50.0
66.7
4
200.0 266.6
8
400.0 533.3
4
50.0 66.7



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