Fujitsu D1271, Technical Manual

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D1271 / D1291 CUV-LSV / CUV-LV User’s Manual
3) CPU External Frequency Selection (DIP_SW Switches 5–8)
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).
3. HARDWARE SETUP
3. H/W SETUP
Motherboard Settings
CUV-LSV CPU External
Frequency Selection
83MHz
42MHz
ON 1234
5678
66MHz
33MHz
ON 1234
5678
68MHz
34MHz
ON 1234
5678
75MHz
37MHz
ON 1234
5678
80MHz
40MHz
ON 1234
5678
CPU
PCI
100MHz
33MHz
ON 1234
5678
CPU
PCI 103MHz
34MHz
ON 1234
5678
105MHz
35MHz
ON 1234
5678
110MHz
36MHz
ON 1234
5678
124MHz
31MHz
ON 1234
5678
CPU
PCI
CPU
PCI 150MHz
37MHz
ON 1234
5678
133MHz
33MHz
ON 1234
5678
140MHz
35MHz
ON 1234
5678
120MHz
40MHz
ON 1234
5678
115MHz
38MHz
ON 1234
5678
112MHz
37MHz
ON 1234
5678
CUV-LSV
WARNING!
Set the CPUbus frequency to the recommended settings only.
Frequencies other than the recommended CPU bus frequencies are not guaranteed
stable. Overclocking the processor is not recommended. It may result in a slower
speed.