Asus P/I-AP6N - Manual (Page 16)

16 ASUS P/I-AP6N User’s Manual
III. INSTALLATION
4. CPU External (BUS) Frequency Selection (FS0, FS1)
These jumpers tell the clock generator what frequency to send to the CPU. These
allow the selection of the CPU’s External frequency (or BUS Clock). The BUS
Clock times the BUS Ratio equals the CPU's Internal frequency (the advertised
CPU speed).
5. CPU to BUS Frequency Ratio (BF0, BF1, BF2, BF3)
These jumpers set the frequency ratio between the Internal frequency of the
CPU and the External frequency (called the BUS Clock) within the CPU. These
must be set together with the above jumpers CPU External (BUS) Frequency
Selection.
R
CPU External Clock (BUS) Frequency Selection
FS1 FS0 FS1 FS0 FS1 FS0 FS1 FS0
60MHz 66MHz Reserved Reserved
CPU : BUS Frequency Ratio (2.0x, 2.5x, 3.0x, 3.5x, 4.0x)
3.5 x 2.0 x 2.5 x 3.0 x 4.0 x
BF0
BF1
BF2
BF3 BF0
BF1
BF2
BF3 BF0
BF1
BF2
BF3 BF0
BF1
BF2
BF3 BF0
BF1
BF2
BF3
Set the jumpers by the Internal speed of the Intel CPU as follows:
(BUS Freq.) (CPU to BUS Freq. Ratio)
Freq. Ratio BUS Freq. FS1 FS0 BF0 BF1 BF2 BF3
200MHz 3.0x 66MHz [1-2] [2-3] [ON] [OFF] [ON] [ON]
180MHz 3.0x 60MHz [2-3] [1-2] [ON] [OFF] [ON] [ON]
166MHz 2.5x 66MHz [1-2] [2-3] [OFF] [ON] [ON] [ON]
150MHz 2.5x 60MHz [2-3] [1-2] [OFF] [ON] [ON] [ON]
(Jumpers)
III. INST
ALLA
TION