Specifications

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