Clock Configuration Modes
6
CPM_CLK/PCI_CLK ratio. When PCI_MODCK = 1, the ratio of CPM_CLK/PCI_CLK should be calculated from
PCIDF as follows:
PCIDF = 3 > CPM_CLK/PCI_CLK = 4
PCIDF = 5 > CPM_CLK/PCI_CLK = 6
PCIDF = 7 > CPM_CLK/PCI_CLK = 8
PCIDF = 9 > CPM_CLK/PCI_CLK = 5
PCIDF = B > CPM_CLK/PCI_CLK = 6
7.2
PCI Agent Mode
These tables show configurations for PCI agent mode. The frequency values 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. Note that in PCI agent mode the input clock is PCI
clock.
Table 19. Clock Configurations for PCI Agent Mode (PCI_MODCK=0)
1,2
Mode
3
MODCK_H-
MODCK[1-3]
PCI Clock
(MHz)
Low
High
CPM Clock
(MHz)
Low
High
CPU Clock
(MHz)
Low
High
Bus Clock
(MHz)
Low
High
CPM
Multiplication
Factor
4
CPU
Multiplication
Factor
5
Bus
Division
Factor
Default Modes (MODCK_H=0000)
0000_000
0000_001
0000_010
0000_011
0000_100
0000_101
0000_110
0000_111
60.0
50.0
50.0
50.0
50.0
50.0
50.0
50.0
66.7
66.7
66.7
66.7
66.7
66.7
66.7
66.7
2
2
3
3
3
3
4
4
120.0 133.3
100.0 133.3
150.0 200.0
150.0 200.0
150.0 200.0
150.0 200.0
200.0 266.6
200.0 266.6
2.5
3
3
4
3
3.5
3.5
3
150.0 166.7
150.0 200.0
150.0 200.0
200.0 266.6
180.0 240.0
210.0 280.0
233.3 311.1
240.0 320.0
2
2
3
3
2.5
2.5
3
2.5
60.0
50.0
50.0
50.0
60.0
60.0
66.7
66.7
66.7
66.7
66.7
80.0
80.0
88.9
80.0 106.7
Full Configuration Modes
0001_001
0001_010
0001_011
0001_100
60.0
50.0
50.0
50.0
66.7
66.7
66.7
66.7
2
2
2
2
120.0 133.3
100.0 133.3
100.0 133.3
100.0 133.3
5
6
7
8
150.0 166.7
150.0 200.0
175.0 233.3
200.0 266.6
4
4
4
4
30.0
25.0
25.0
25.0
33.3
33.3
33.3
33.3
0010_001
0010_010
0010_011
0010_100
50.0
50.0
50.0
50.0
66.7
66.7
66.7
66.7
3
3
3
3
150.0 200.0
150.0 200.0
150.0 200.0
150.0 200.0
3
3.5
4
4.5
180.0 240.0
210.0 280.0
240.0 320.0
270.0 360.0
2.5
2.5
2.5
2.5
60.0
60.0
60.0
60.0
80.0
80.0
80.0
80.0
MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 3
36
Freescale Semiconductor
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
