mpc8250 Freescale Semiconductor, Inc, mpc8250 Datasheet - Page 24

• Manufacturer Part Number: mpc8250
• Description: Mpc8250 Powerquicc Ii Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

Clock Configuration Modes
3.2.1
The frequencies listed 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 16
mode.
24
1
2
MODCK[1–
MODCK[1–3]
MODCK_H
0011_000
0011_001
0011_010
0001_000
0001_001
0001_010
0001_011
0010_000
0010_001
0010_010
0010_011
divided by 2 (33 instead of 66 MHz, etc.) Refer to
Assumes MODCK_HI = 0000.
The frequency depends on the value of PCI_MODCK. If PCI_MODCK is high (logic ‘1’), the PCI frequency is
describes all possible clock configurations when using the MPC8250’s internal PCI bridge in host
3]
–
000
001
010
011
100
101
110
111
PCI Host Mode
3
3
3
Table 15. Clock Default Configurations in PCI Host Mode (MODCK_HI = 0000)
1
Frequency
Input Clock
Input Clock
Frequency
33 MHz
33 MHz
33 MHz
33 MHz
33 MHz
33 MHz
33 MHz
33 MHz
33 MHz
33 MHz
33 MHz
(Bus)
66 MHz
66 MHz
66 MHz
66 MHz
66 MHz
66 MHz
66 MHz
66 MHz
(Bus)
Table 16. Clock Configuration Modes in PCI Host Mode
1
Multiplication
Multiplication
Factor
Factor
CPM
CPM
MPC8250 Hardware Specifications, Rev. 1
2.5
2.5
2.5
3
3
3
3
4
4
4
4
5
5
5
2
2
3
3
3
Frequency
Frequency
133 MHz
133 MHz
166 MHz
166 MHz
166 MHz
200 MHz
200 MHz
200 MHz
100 MHz
100 MHz
100 MHz
100 MHz
133 MHz
133 MHz
133 MHz
133 MHz
166 MHz
166 MHz
166 MHz
CPM
CPM
Table
Multiplication
12.
Multiplication
Factor
Factor
Core
Core
2.5
3.5
3.5
3
3
4
3
4
5
6
7
8
5
6
7
8
5
6
7
Frequency
Frequency
166 MHz
200 MHz
200 MHz
233 MHz
266 MHz
200 MHz
233 MHz
266 MHz
166 MHz
200 MHz
233 MHz
266 MHz
166 MHz
200 MHz
233 MHz
266 MHz
166 MHz
200 MHz
233 MHz
Core
Core
PCI Division
PCI Division
Factor
Factor
2/4
2/4
3/6
3/6
3/6
3/6
3/6
3/6
3/6
3/6
3/6
3/6
4/8
4/8
4/8
4/8
5
5
5
Freescale Semiconductor
2
2
Frequency
Frequency
66/33 MHz
66/33 MHz
55/28 MHz
55/28 MHz
55/28 MHz
66/33 MHz
66/33 MHz
66/33 MHz
33/16 MHz
33/16 MHz
33/16 MHz
33/16 MHz
33/16 MHz
33/16 MHz
33/16 MHz
33/16 MHz
33 MHz
33 MHz
33 MHz
PCI
PCI
2
2