Instruction Manual

24 Chapter 2: Hardware information
P4S133
®
P4S133 CPU
External Frequency Selection
CPU
DSW1
DRAM
100MHz
ON
12345
100MHz
ON
12345
100MHz
133MHz
ON
12345
100MHz
150MHz
ON
12345
100MHz
166MHz
ON
12345
100MHz
160MHz
CPU
DRAM
105MHz
ON
12345
140MHz
ON
12345
108MHz
144MHz
ON
12345
112MHz
149MHz
ON
12345
133MHz
133MHz
133MHz
166MHz
ON
12345
2) CPU External Frequency Selection (DSW1 Switches 1–5)
This option tells the clock generator what frequency to send to the
CPU and DRAM clock. 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).
Frequency Table
MHz DSW
CPU DRAM 1 2 3 4 5
100 100 [OFF] [OFF] [OFF] [OFF] [OFF]
100 133 [OFF] [ON] [OFF] [OFF] [OFF]
100 150 [ON] [OFF] [ON] [OFF] [ON]
100 160 [ON] [ON] [ON] [OFF] [ON]
100 166 [OFF] [OFF] [OFF] [ON] [ON]
105 140 [ON] [OFF] [OFF] [OFF] [OFF]
108 144 [ON] [ON] [OFF] [OFF] [OFF]
112 149 [ON] [OFF] [ON] [OFF] [OFF]
133 133 [ON] [ON] [ON] [OFF] [OFF]
133 166 [OFF] [ON] [ON] [OFF] [OFF]