MPC8264AVR datasheet(27/48 Pages) MOTOROLA

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MOTOROLA

MPC826xA (HiP4) Family Hardware Speciﬁcations

Clock Conﬁguration Modes

1.3.2.2

PCI Agent Mode

The frequencies listed in Table 17 and Table 18 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.

Table 18 describes all possible clock conﬁgurations when using the MPC8265 or the MPC8266’s internal

PCI bridge in agent mode.

Table 17. Clock Default Conﬁgurations in PCI Agent Mode (MODCK_HI = 0000)

MODCK[1–3]1

1 Assumes MODCK_HI = 0000.

Input Clock

Frequency

(PCI)2

CPM

Multiplication

Factor2

2 The frequency depends on the value of PCI_MODCK. If PCI_MODCK is high (logic ‘1’), the PCI frequency is

divided by 2 (33 instead of 66 MHz, etc.) and the CPM multiplication factor is multiplied by 2. Refer to

Table 14.

CPM

Frequency

Core

Multiplication

Factor

Core

Frequency3

3 Core frequency = (60x bus frequency)(core multiplication factor)

Bus Division

Factor

60x Bus

Frequency4

4 Bus frequency = CPM frequency / bus division factor

000

66/33 MHz

2/4

133 MHz

2.5

166 MHz

66 MHz

001

66/33 MHz

2/4

133 MHz

200 MHz

66 MHz

010

66/33 MHz

3/6

200 MHz

66 MHz

011

66/33 MHz

3/6

200 MHz

266 MHz

66 MHz

100

66/33 MHz

3/6

200 MHz

240 MHz

2.5

80 MHz

101

66/33 MHz

3/6

200 MHz

3.5

280 MHz

2.5

80 MHz

110

66/33 MHz

4/8

266 MHz

3.5

300 MHz

88 MHz

111

66/33 MHz

4/8

266 MHz

300 MHz

2.5

100 MHz

Table 18. Clock Conﬁguration Modes in PCI Agent Mode

MODCK_H –

MODCK[1–3]

Input Clock

Frequency

(PCI)1,2

CPM

Multiplication

Factor1

CPM

Frequency

Core

Multiplication

Factor

Core

Frequency3

Bus Division

Factor

60x Bus

Frequency4

0001_001

66/33 MHz

2/4

133 MHz

166 MHz

33 MHz

0001_010

66/33 MHz

2/4

133 MHz

200 MHz

33 MHz

0001_011

66/33 MHz

2/4

133 MHz

233 MHz

33 MHz

0001_100

66/33 MHz

2/4

133 MHz

266 MHz

33 MHz

0010_001

50/25 MHz

3/6

150 MHz

180 MHz

2.5

60 MHz

0010_010

50/25 MHz

3/6

150 MHz

3.5

210 MHz

2.5

60 MHz

0010_011

50/25 MHz

3/6

150 MHz

240 MHz

2.5

60 MHz

0010_100

50/25 MHz

3/6

150 MHz

4.5

270 MHz

2.5

60 MHz

0011_000

66/33 MHz

2/4

133 MHz

2.5

110MHz

44 MHz

0011_001

66/33 MHz

2/4

133 MHz

132 MHz

44 MHz

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