MPC8250AZUPIBC データシートの表示（PDF） - Freescale Semiconductor

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MPC8250AZUPIBC

MPC8250 Hardware Specifications

Freescale Semiconductor 

Clock Configuration Modes

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

MODCK[1–3]1

Input Clock

Frequency

(PCI)2

CPM

Multiplication

Factor 2

CPM

Frequency

Core

Multiplication

Factor

Core

Frequency 3

Bus Division 60x Bus

Factor Frequency4

100

66/33 MHz

3/6

200 MHz

3

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

3

88 MHz

111

66/33 MHz

4/8

266 MHz

3

300 MHz

2.5

100 MHz

1 Assumes MODCK_HI = 0000.

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 12

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

4 Bus frequency = CPM frequency / bus division factor

Table 18 describes all possible clock configurations when using the MPC8250’s internal PCI bridge in

agent mode.

Table 18. Clock Configuration Modes in PCI Agent Mode

MODCK_H

–

MODCK[1–

3]

Input Clock

CPM

Frequency Multiplication

(PCI) 1, 2

Factor1

CPM

Frequency

Core

Multiplication

Factor

Core

Frequency 3

Bus Division

Factor

60x Bus

Frequency 4

0001_001 66/33 MHz

2/4

133 MHz

5

0001_010 66/33 MHz

2/4

133 MHz

6

0001_011 66/33 MHz

2/4

133 MHz

7

0001_100 66/33 MHz

2/4

133 MHz

8

166 MHz

4

200 MHz

4

233 MHz

4

266 MHz

4

33 MHz

33 MHz

33 MHz

33 MHz

0010_001 50/25 MHz

3/6

150 MHz

3

0010_010 50/25 MHz

3/6

150 MHz

3.5

0010_011 50/25 MHz

3/6

150 MHz

4

0010_100 50/25 MHz

3/6

150 MHz

4.5

180 MHz

2.5

210 MHz

2.5

240 MHz

2.5

270 MHz

2.5

60 MHz

60 MHz

60 MHz

60 MHz

0011_000 66/33 MHz

2/4

133 MHz

2.5

110MHz

3

0011_001 66/33 MHz

2/4

133 MHz

3

132 MHz

3

0011_010 66/33 MHz

2/4

133 MHz

3.5

154 MHz

3

0011_011 66/33 MHz

2/4

133 MHz

4

176MHz

3

0011_100 66/33 MHz

2/4

133 MHz

4.5

198 MHz

3

44 MHz

44 MHz

44 MHz

44 MHz

44 MHz

0100_000 66/33 MHz

3/6

200 MHz

2.5

166 MHz

3

0100_001 66/33 MHz

3/6

200 MHz

3

200 MHz

3

0100_010 66/33 MHz

3/6

200 MHz

3.5

233 MHz

3

66 MHz

66 MHz

66 MHz

MPC8250 Hardware Specifications, Rev. 2

Freescale Semiconductor

27

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