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Chapter 1 Hardware Installation
15
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
(CPUCLK)
CLK1 CLK2 FREQ1
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
(CPUCLK)
CLK1 CLK2 FREQ1
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
P54C
For
P55C,
and K6
For
K5
FREQ1 FREQ2 FREQ3
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