mpc8250 Freescale Semiconductor, Inc, mpc8250 Datasheet - Page 27

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

Table 18
agent mode.
Freescale Semiconductor
1
2
3
4
MODCK[1–3]
by 2 (33 instead of 66 MHz, etc.) and the CPM multiplication factor is multiplied by 2. Refer to
MODCK[1–
The frequency depends on the value of PCI_MODCK. If PCI_MODCK is high (logic ‘1’), the PCI frequency is divided
MODCK_H
Assumes MODCK_HI = 0000.
Core frequency = (60x bus frequency)(core multiplication factor)
Bus frequency = CPM frequency / bus division factor
0001_001
0001_010
0001_011
0001_100
0010_001
0010_010
0010_011
0010_100
0011_000
0011_001
0011_010
0011_100
0100_000
0100_001
0100_010
0011_011
100
101
describes all possible clock configurations when using the MPC8250’s internal PCI bridge in
110
111
3]
–
Table 17. Clock Default Configurations in PCI Agent Mode (MODCK_HI = 0000)
1
Input Clock
Frequency
66/33 MHz
66/33 MHz
66/33 MHz
66/33 MHz
50/25 MHz
50/25 MHz
50/25 MHz
50/25 MHz
66/33 MHz
66/33 MHz
66/33 MHz
66/33 MHz
66/33 MHz
66/33 MHz
66/33 MHz
66/33 MHz
Input Clock
Frequency
(PCI)
66/33 MHz
66/33 MHz
66/33 MHz
66/33 MHz
(PCI)
1, 2
Table 18. Clock Configuration Modes in PCI Agent Mode
2
Multiplication
Multiplication
Factor
Factor
CPM
2/4
2/4
2/4
2/4
3/6
3/6
3/6
3/6
2/4
2/4
2/4
2/4
2/4
3/6
3/6
3/6
CPM
MPC8250 Hardware Specifications, Rev. 1
3/6
3/6
4/8
4/8
1
2
Frequency
Frequency
133 MHz
133 MHz
133 MHz
133 MHz
150 MHz
150 MHz
150 MHz
150 MHz
133 MHz
133 MHz
133 MHz
133 MHz
133 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
266 MHz
266 MHz
CPM
CPM
Multiplication
Multiplication
Factor
Core
Factor
3.5
4.5
2.5
3.5
4.5
2.5
3.5
Core
5
6
7
8
3
4
3
4
3
3.5
3.5
3
3
Frequency
Frequency
166 MHz
200 MHz
233 MHz
266 MHz
180 MHz
210 MHz
240 MHz
270 MHz
132 MHz
154 MHz
198 MHz
166 MHz
200 MHz
233 MHz
176MHz
110MHz
240 MHz
280 MHz
300 MHz
300 MHz
Core
Core
3
3
Bus Division
Bus Division
Factor
Factor
2.5
2.5
2.5
2.5
4
4
4
4
3
3
3
3
3
3
3
3
2.5
2.5
2.5
3
Clock Configuration Modes
Table 12
Frequency
Frequency
60x Bus
33 MHz
33 MHz
33 MHz
33 MHz
60 MHz
60 MHz
60 MHz
60 MHz
44 MHz
44 MHz
44 MHz
44 MHz
44 MHz
66 MHz
66 MHz
66 MHz
100 MHz
60x Bus
80 MHz
80 MHz
88 MHz
4
4
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