American Megatrends MAN-772 manual For, P54C P55C

Step 3 Configure CPU, Continued

ICS 9147 Clock Generator The following CLK1, CLK2, and CLK3 settings apply only if an

ICS 9147 clock generator is mounted on the motherboard.

External	CLK1	CLK2	FREQ1
(CPUCLK)
66 6 MHz	Short Pins 1-2	Short Pins 2-3	Short Pins 2-3
60 MHz	Short Pins 2-3	Short Pins 2-3	Short Pins 2-3
55 MHz	Short Pins 1-2	Short Pins 1-2	Short Pins 2-3
50 MHz	Short Pins 2-3	Short Pins 1-2	Short Pins 2-3

ICW or PhaseLink Clock Generator The following CLK1, CLK2, and CLK3 settings apply only if an ICW or PhaseLink clock generator is mounted on the motherboard.

External	CLK1	CLK2	FREQ1
(CPUCLK)
66 6 MHz	Short Pins 1-2	Short Pins 1-2	Short Pins 1-2
60 MHz	Short Pins 2-3	Short Pins 1-2	Short Pins 1-2
55 MHz	Short Pins 2-3	Short Pins 2-3	Short Pins 1-2
50 MHz	N/A	N/A	N/A

CPU/Bus Frequency Ratio FREQ1, FREQ2, and FREQ3 are 3-pin bergs that set the ratio of the internal CPU frequency to the bus clock.

For	For	For	FREQ1	FREQ2	FREQ3
P54C	P55C,	K5
	and K6
3x	3x	2x	Short Pins 1-2	Short Pins 2-3	Short Pins 1-2
2.5x	2.5x	1.75x	Short Pins 2-3	Short Pins 2-3	Short Pins 1-2
2x	2x	N/A	Short Pins 2-3	Short Pins 1-2	Short Pins 1-2
1.5x	3.5x	1.5x	Short Pins 1-2	Short Pins 1-2	Short Pins 1-2

Cont’d

Chapter 1 Hardware Installation 15