User Guide

3-4 Chapter 3
CPU Operating Speed:
This option sets the CPU speed.
In this field, the CPU speed is indicated like this: CPU speed (external clock
rate * multiplier factor)
Select the CPU speed according to the type and speed of your CPU.
¡i Note 1 ¡j For Intel Pentium

II and Celeron
®
MMX CPUs,
you can choose the following settings:
ä 233 (66x3.5) ä 266 (66x4) ä 300 (66x4.5)
ä 333 (66x5) ä 350 (100x3.5) ä 400 (100x4)
ä 450 (100x4.5) …………
¡i Note 2 ¡j User define external clock and multiplier
factor:
ä User Define
/ External Clock:
ä 66MHz ä 75MHz* ä 83MHz*
ä 100MHz ä 112MHz* ä 133MHz*…
* Above 66/100 MHz bus speed supported but not guaranteed due to the CPU and chipset
specs.
/ Multiplier Factor:
You can choose the following multiplier factors:
ä 2.0 ä 2.5 ä 3.0 ä 3.5 ä 4.0 ä 4.5
ä 5.0 ä 5.5 …………….
However, differences will exist because of the various
types of Intel Pentium

II and Celeron
®
CPUs available.
Normally, we do not recommend that you use the “User Define” option to setup
CPU speed and multiplier factor. This option is for setup of future CPUs whose
specifications are still unknown. The specifications of all present CPUs are
included in the default settings. Unless you are very familiar with all CPU
parameters, it is very easy to make mistakes when you define by yourself the
external clock and the multiplier factor.
/ Turbo Frequency:
The Turbo mode allows you to speed up the external clock by
approximately 2.5%. This feature is used to verify the design flexibility.
It is a very important tool for test units to verify CPU stability.