MPC8272EC datasheet(34/60 Pages) FREESCALE

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MPC8272 PowerQUICC II™ Family Hardware Specifications, Rev. 2

Freescale Semiconductor

Clock Configuration Modes

1110_001

50.0

100.0

150.0 300.0

200.0 400.0

25.0

50.0

1110_010

50.0

100.0

150.0 300.0

4.5

225.0 450.0

25.0

50.0

1110_011

50.0

100.0

150.0 300.0

250.0 500.0

25.0

50.0

1110_100

50.0

100.0

150.0 300.0

5.5

275.0 550.0

25.0

50.0

1100_000

Reserved

1100_001

Reserved

1100_010

Reserved

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.

PCI_MODCK determines the PCI clock frequency range. Refer to Table 16 for higher range configurations.

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.

CPM multiplication factor = CPM clock/bus clock

CPU multiplication factor = Core PLL multiplication factor

CPM_CLK/PCI_CLK ratio. When PCI_MODCK = 1, the ratio of CPM_CLK/PCI_CLK should be calculated from

PCIDF as follows:

PCIDF = 3 > CPM_CLK/PCI_CLK = 4

PCIDF = 5 > CPM_CLK/PCI_CLK = 6

PCIDF = 7 > CPM_CLK/PCI_CLK = 8

PCIDF = 9 > CPM_CLK/PCI_CLK = 5

PCIDF = B > CPM_CLK/PCI_CLK = 6

Table 17. Clock Configurations for PCI Host Mode (PCI_MODCK=1) 1, 2 (continued)

Mode 3

Bus Clock

(MHz)

CPM

Multiplication

Factor 4

CPM Clock

(MHz)

CPU

Multiplication

Factor 5

CPU Clock

(MHz)

PCI

Division

Factor 6

PCI Clock

(MHz)

MODCK_H-

MODCK[1-3]

Low

High

Low

High

Low

High

Low

High

MPC8272EC Datasheet(PDF) 34 Page - Freescale Semiconductor, Inc

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