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MPC8272EC Datasheet(PDF) 42 Page - Freescale Semiconductor, Inc

Part # MPC8272EC
Description  PowerQUICC II??Family Hardware Specifications
PDF  60 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8272EC Datasheet(HTML) 42 Page - Freescale Semiconductor, Inc

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MPC8272 PowerQUICC II™ Family Hardware Specifications, Rev. 2
42
Freescale Semiconductor
Clock Configuration Modes
1110_000
25.0
50.0
5
125.0 250.0
2.5
156.3 312.5
2
62.5
125.0
1110_001
25.0
50.0
5
125.0 250.0
3
187.5 375.0
2
62.5
125.0
1110_010
28.6
50.0
5
142.9 250.0
3.5
250.0 437.5
2
71.4
125.0
1110_011
25.0
50.0
5
125.0 250.0
4
250.0 500.0
2
62.5
125.0
1110_100
25.0
50.0
5
125.0 250.0
4
166.7 333.3
3
41.7
83.3
1110_101
25.0
50.0
5
125.0 250.0
4.5
187.5 375.0
3
41.7
83.3
1110_110
25.0
50.0
5
125.0 250.0
5
208.3 416.7
3
41.7
83.3
1110_111
25.0
50.0
5
125.0 250.0
5.5
229.2 458.3
3
41.7
83.3
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
exceed the frequency rating of the user’s device. The minimum CPU frequency is 150 MHz for commercial
temperature devices and 175 MHz for extended temperature devices. The minimum CPM frequency is 120 MHz.
2
PCI_MODCK determines the PCI clock frequency range. Refer to Table 18 for higher range configurations.
3
MODCK_H = hard reset configuration word [28–31] (refer to Section 5.4 in the
MPC8260 User’s Manual).
MODCK[1-3] = three hardware configuration pins.
4
CPM multiplication factor = CPM clock/bus clock
5
CPU multiplication factor = Core PLL multiplication factor
Table 19. Clock Configurations for PCI Agent Mode (PCI_MODCK=1) 1, 2 (continued)
Mode 3
PCI Clock
(MHz)
CPM
Multiplication
Factor 4
CPM Clock
(MHz)
CPU
Multiplication
Factor 5
CPU Clock
(MHz)
Bus
Division
Factor
Bus Clock
(MHz)
MODCK_H-
MODCK[1-3]
Low
High
Low
High
Low
High
Low
High



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