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MPC8250 Hardware Specifications, Rev. 2
Freescale Semiconductor 27
Clock Configuration Modes
Table 18 describes all possible clock configurations when using the MPC8250’s internal PCI bridge in
agent mode.
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. Clock Configuration Modes in PCI Agent Mode
MODCK_H
–
MODCK[1–
3]
Input Clock
Frequency
(PCI)
1, 2
CPM
Multiplication
Factor
1
CPM
Frequency
Core
Multiplication
Factor
Core
Frequency
3
Bus Division
Factor
60x Bus
Frequency
4
0001_001 66/33 MHz 2/4 133 MHz 5 166 MHz 4 33 MHz
0001_010 66/33 MHz 2/4 133 MHz 6 200 MHz 4 33 MHz
0001_011 66/33 MHz 2/4 133 MHz 7 233 MHz 4 33 MHz
0001_100 66/33 MHz 2/4 133 MHz 8 266 MHz 4 33 MHz
0010_001 50/25 MHz 3/6 150 MHz 3 180 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 4 240 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 3 44 MHz
0011_001 66/33 MHz 2/4 133 MHz 3 132 MHz 3 44 MHz
0011_010 66/33 MHz 2/4 133 MHz 3.5 154 MHz 3 44 MHz
0011_011 66/33 MHz 2/4 133 MHz 4 176MHz 3 44 MHz
0011_100 66/33 MHz 2/4 133 MHz 4.5 198 MHz 3 44 MHz
0100_000 66/33 MHz 3/6 200 MHz 2.5 166 MHz 3 66 MHz
0100_001 66/33 MHz 3/6 200 MHz 3 200 MHz 366 MHz
0100_010 66/33 MHz 3/6 200 MHz 3.5 233 MHz 366 MHz
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
Factor
60x Bus
Frequency
4