CHAPTER 2
HARDWARE INSTALLATION
2-2
2.1-2 CPU Core Speed Derivation Procedure
1
2
3
4
Core/Bus Ratio
ON
OFF
ON
ON
2.5
ON
ON
OFF
ON
3
ON
OFF
OFF
ON
3.5
ON
ON
ON
OFF
4
ON
OFF
ON
OFF
4.5
ON
ON
OFF
OFF
5
ON
OFF
OFF
OFF
5.5
OFF
ON
ON
ON
6
OFF
OFF
ON
ON
6.5
OFF
ON
OFF
ON
7
OFF
OFF
OFF
ON
7.5
OFF
ON
ON
OFF
8
1. The DIP Switch SW1 (1, 2, 3, and 4) is used to set the Core/Bus (Fraction)
ratio of the CPU. The actual core speed of the CPU is the Host Clock
Frequency multiplied by the Core/Bus ratio. For example:
If
CPU Clock
=
66MHz/100MHz
Core/Bus ratio
=
4
then
CPU core speed
=
Host Clock x Core/Bus ratio
=
66MHz x 4/100MHz x 4
=
266MHz/400MHz
SW1
CPU
Note:
The CPU Bus Frequency is set at 66MHz or 100MHz by CPU
default.
ON - Short
OFF - Open
