American Megatrends Apollo IV User Manual page 19

American megatrends apollo iv motherboards: user guide

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Step 3 Configure CPU,

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

(CPUCLK)

66 6 MHz

60 MHz

55 MHz

50 MHz

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

(CPUCLK)

66 6 MHz

60 MHz

55 MHz

50 MHz

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

P54C

P55C,

and K6

2.5x

1.5x

3.5x

Chapter 1 Hardware Installation

Continued

CLK1

CLK2

Short Pins 1-2

Short Pins 2-3

Short Pins 1-2

Short Pins 2-3

Short Pins 1-2

CLK1

CLK2

Short Pins 1-2

Short Pins 2-3

Short Pins 1-2

Short Pins 2-3

N/A

For

FREQ1

Short Pins 1-2

1.75x

Short Pins 2-3

N/A

Short Pins 2-3

1.5x

Short Pins 1-2

FREQ1

Short Pins 2-3

FREQ1

Short Pins 1-2

N/A

FREQ2

FREQ3

Short Pins 2-3

Short Pins 1-2

Short Pins 2-3

Short Pins 1-2

Cont'd

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American Megatrends Apollo IV User Manual page 19

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