MPC8264AVR datasheet(23/48 Pages) MOTOROLA

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MPC826xA (HiP4) Family Hardware Speciﬁcations

Clock Conﬁguration Modes

1.3.2

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 14.

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.

0111_111

66 MHz

3.5

233 MHz

133 MHz

1000_000

66 MHz

3.5

233 MHz

2.5

166 MHz

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 13 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 than150 MHz and the CPM ranges between 66–233 MHz.

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

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

Table 14. 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 13. 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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