Aaeon SBC-656, Manual

Page: 28 / 103

Chapter 2 Installation 19
Note:
Most Celeron CPUs' frequency ratio are pre-locked
within the CPUs. Thess CPUs run at fixed speed
(frequency) regardless of the configurations listed above.
If the CPU you are using requires higher ratio then 5.5X, it
is most likely pre-locked.
CPU frequency ratio select
CPU core frequency = CPU frequency ratio (3~5.5) * External bus
clock (66MHz)
CPU frequency ratio select SW1 (4, 5, 6)
3X 3.5X 4.0X
4.5X * 5 X 5.5X
* default
ON
1
2
3
4
5
6
ON
1
2
3
4
5
6
ON
1
2
3
4
5
6
ON
1
2
3
4
5
6
ON
1
2
3
4
5
6
ON
1
2
3
4
5
6