MPC8248CZQB datasheet(38/56 Pages) MOTOROLA

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MPC8272 PowerQUICC II™ Family Hardware Speciﬁcations

MOTOROLA

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

Clock Configuration Modes

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

guarantees the required minimum CPU operating frequency. Minimum CPU frequency is determined by the clock

mode. For modes with a CPU multiplication factor

≤ 3, the minimum CPU frequency is 125 MHz or 150 MHz, as

shown in the table. For modes with a CPU multiplication factor

≥ 3.5, the minimum CPU frequency is 250 MHz.

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.

2 PCI_MODCK determines the PCI clock frequency range. Refer to Table 17 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 18. 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

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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