Clocking
15.4 Frequency Options
Table 58 shows the expected frequency values for the platform frequency when using a CCB to SYSCLK
ratio in comparison to the memory bus speed.
Table 58. Frequency Options with Respect to Memory Bus Speeds
CCB to
SYSCLK
Ratio
SYSCLK (MHz)
66.67
16.67
25
33.33
41.63
83
100
111
133.33
Platform/CCB Frequency (MHz)
2
3
200
300
222
333
267
200
267
333
250
333
4
5
208
250
333
6
200
267
300
333
8
200
225
250
300
9
10
12
16
200
267
MPC8540 Integrated Processor Hardware Specifications, Rev. 4
78
Freescale Semiconductor