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MPC8271VRM 数据表(PDF) 25 Page - Freescale Semiconductor, Inc

部件名 MPC8271VRM
功能描述  PowerQUICC II??Family Hardware Specifications
PDF  60 Pages
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

MPC8271VRM 数据表(HTML) 25 Page - Freescale Semiconductor, Inc

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MPC8272 PowerQUICC II™ Family Hardware Specifications, Rev. 1.5
Freescale Semiconductor
25
Clock Configuration Modes
hardware configuration word[28–31] (MODCK_H). Both the PLLs and the dividers are set according to
the selected clock operation mode as described in the following sections.
NOTE
Clock configurations change only after PORESET is asserted.
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.
7.1
PCI Host Mode
Table 16 and Table 17 show configurations for PCI host mode. The frequency values 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 that in PCI host mode the
input clock is the bus clock.
Table 16. Clock Configurations for PCI Host Mode (PCI_MODCK=0) 1, 2
Mode 3
Bus Clock
(MHz)
CPM
Multiplication
Factor 4
CPM Clock
(MHz)
CPU
Multiplication
Factor 5
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



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