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Chapter 2: Hardware information
2) CPU External Frequency Selection (DIP_SW Switches 1–4)
This option tells the clock generator what frequency to send to the CPU,
DRAM, and the PCI bus. This allows the selection of the CPU’s External
frequency (or BUS Clock). The BUS Clock multiplied by the Frequency
Multiple equals the CPU’s Internal frequency (the advertised CPU speed).
A7V333
®
ON
12345
6
100MHz
ON
12345
6
133MHz
ON
12345
6
166MHz
ON
12345
6
140MHz
ON
12345
6
150MHz
ON
12345
6
170MHz
ON
12345
6
180MHz
ON
12345
6
190MHz
ON
12345
6
200MHz
ON
12345
6
210MHz
ON
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6
220MHz
ON
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6
230MHz
SYSCLK
A7V333 CPU
External Frequency Selection
CPU
CPU
CPU
WARNING! Set the SYSCLK frequency only to the recommended
settings. Frequencies other than the recommended CPU bus frequencies
are not guaranteed to be stable. Overclocking the processor is not
recommended. It may result in a slower speed.
Frequency Table
DSW
CPU MHz 1 2 3 4 5 6
100 [OFF] [OFF] [OFF] [OFF] [ON] [ON]
133 [ON] [OFF] [OFF] [OFF] [OFF] [ON]
166 [ON] [ON] [OFF] [OFF] [OFF] [OFF]
140 [OFF] [ON] [ON] [OFF] [OFF] [ON]
150 [ON] [OFF] [OFF] [ON] [OFF] [ON]
170 [OFF] [OFF] [OFF] [ON] [OFF] [OFF]
180 [ON] [ON] [OFF] [ON] [OFF] [OFF]
190 [OFF] [ON] [OFF] [ON] [OFF] [OFF]
200 [ON] [OFF] [ON] [ON] [OFF] [OFF]
210 [OFF] [OFF] [ON] [ON] [OFF] [OFF]
220 [ON] [ON] [ON] [ON] [OFF] [OFF]
230 [OFF] [ON] [ON] [ON] [OFF] [OFF]