MPC8250AVR Просмотр технического описания (PDF) - Freescale Semiconductor

Номер в каталоге

Компоненты Описание

производитель

MPC8250AVR

MPC8250 Hardware Specifications

Freescale Semiconductor 

Clock Configuration Modes

3.2.1 PCI Host Mode

The frequencies listed in Table 15 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 15. Clock Default Configurations in PCI Host Mode (MODCK_HI = 0000)

MODCK[1–3]1

Input Clock

Frequency

(Bus)

CPM

Multiplication

Factor

CPM

Frequency

Core

Multiplication

Factor

Core

Frequency

PCI Division

Factor 2

PCI

Frequency2

000

66 MHz

2

133 MHz

2.5

166 MHz

2/4

66/33 MHz

001

66 MHz

2

133 MHz

3

200 MHz

2/4

66/33 MHz

010

66 MHz

2.5

166 MHz

3

200 MHz

3/6

55/28 MHz

011

66 MHz

2.5

166 MHz

3.5

233 MHz

3/6

55/28 MHz

100

66 MHz

2.5

166 MHz

4

266 MHz

3/6

55/28 MHz

101

66 MHz

3

200 MHz

3

200 MHz

3/6

66/33 MHz

110

66 MHz

3

200 MHz

3.5

233 MHz

3/6

66/33 MHz

111

66 MHz

3

200 MHz

4

266 MHz

3/6

66/33 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.) Refer to Table 12.

Table 16 describes all possible clock configurations when using the MPC8250’s internal PCI bridge in host

mode.

Table 16. Clock Configuration Modes in PCI Host Mode

MODCK_H

–

MODCK[1–

3]

Input Clock

Frequency 1

(Bus)

CPM

Multiplication

Factor

CPM

Frequency

Core

Multiplication

Factor

Core

Frequency

PCI Division

Factor 2

PCI

Frequency2

0001_000

0001_001

0001_010

0001_011

33 MHz

33 MHz

33 MHz

33 MHz

3

100 MHz

5

166 MHz

3/6

33/16 MHz

3

100 MHz

6

200 MHz

3/6

33/16 MHz

3

100 MHz

7

233 MHz

3/6

33/16 MHz

3

100 MHz

8

266 MHz

3/6

33/16 MHz

0010_000

0010_001

0010_010

0010_011

33 MHz

33 MHz

33 MHz

33 MHz

0011_000 3

0011_0013

33 MHz

33 MHz

4

133 MHz

5

166 MHz

4/8

33/16 MHz

4

133 MHz

6

200 MHz

4/8

33/16 MHz

4

133 MHz

7

233 MHz

4/8

33/16 MHz

4

133 MHz

8

266 MHz

4/8

33/16 MHz

5

166 MHz

5

166 MHz

5

5

166 MHz

6

200 MHz

5

33 MHz

33 MHz

MPC8250 Hardware Specifications, Rev. 2

24

Freescale Semiconductor

Share Link: