XPC8260ZUIFBC datasheet(26/50 Pages) FREESCALE

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MPC8260A PowerQUICC™ II Integrated Communications Processor Hardware Specifications, Rev. 2.0

Freescale Semiconductor

Clock Configuration Modes

3.2

PCI Mode

The MPC8265 and the MPC8266 have three clocking modes: local, PCI host, and PCI agent. The clocking

mode is set according to three input pins—PCI_MODE, PCI_CFG[0], PCI_MODCK—as shown in

Table 15.

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 when PCI_MODCK = 1, and the minimum Tval = 1

when PCI_MODCK = 0. Therefore, designers should use clock

configurations that fit this condition to achieve PCI-compliant AC timing.

NOTE

Clock configurations change only after POR is asserted.

1000_001

66 MHz

3.5

233 MHz

200 MHz

1000_010

66 MHz

3.5

233 MHz

3.5

233 MHz

1000_011

66 MHz

3.5

233 MHz

266 MHz

1000_100

66 MHz

3.5

233 MHz

4.5

300 MHz

1 Because of speed dependencies, not all of the possible configurations in Table 14 are applicable.

2 The user should choose the input clock frequency and the multiplication factors such that the frequency of the CPU

is equal to or greater than 150 MHz and the CPM ranges between 66–233 MHz.

3 Input clock frequency is given only for the purpose of reference. The user should set MODCK_H–MODCK_L so that

the resulting configuration does not exceed the frequency rating of the user’s part.

Table 15. MPC8265 and MPC8266 Clocking Modes

Pins

Clocking Mode

PCI Clock

Frequency Range

(MHZ)

PCI_MODE

PCI_CFG[0]

PCI_MODCK

—

Local bus

—

PCI host

50–66

25–50

PCI agent

50–66

25–50

Table 14. Clock Configuration Modes1 (continued)

MODCK_H–MODCK[1–3]

Input Clock

Frequency2,3

CPM Multiplication

Factor2

CPM

Frequency2

Core Multiplication

Factor2

Core

Frequency2

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