2.CPU frequency selection (DSW1 Switches 1-5)

This option tells the clock generator what frequency to send the CPU. 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).

To select the CPU external frequency using the DIP switches, ensure that the JEN jumper is set to jumper mode.

P4S333

DSW1

2 1

 

ON

 

2 1

 

ON

 

2 1

 

ON

 

2 1

 

ON

 

2 1

 

ON

 

 

 

 

 

3

 

 

 

3

 

 

 

3

 

 

 

3

 

 

 

3

 

 

4

 

 

 

4

 

 

 

4

 

 

 

4

 

 

 

4

 

 

5

 

 

 

5

 

 

 

5

 

 

 

5

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CPU 100MHz

100MHz

100MHz

100MHz

100MHz

DRAM 100MHz

133MHz

150MHz

160MHz

166MHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 1

 

ON

 

2 1

 

ON

 

2 1

 

ON

 

2 1

 

ON

 

2 1

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

3

 

 

 

3

 

 

 

3

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

4

 

 

 

4

 

 

 

4

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

5

 

 

 

5

 

 

 

5

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CPU 105MHz

108MHz

112MHz

133MHz

133MHz

DRAM 140MHz

144MHz

149MHz

133MHz

166MHz

P4S333 CPU

External Frequency Selection

Set the CPU frequency only to the recommended settings. Frequencies other than the recommended CPU bus frequencies are not guaranteed to be stable.

3.Keyboard power (3-pin KBPWR1)

This jumper allows you to enable or disable the keyboard wake-up feature. Set this jumper to pins 2-3 (+5VSB) if you wish to wake up the computer when you press a key on the keyboard (the default is the Space Bar). This feature requires an ATX power supply that can supply at least 1A on the +5VSB lead, and a corresponding setting in the BIOS (see section 4.5.1 Power Up Control).

 

KBPWR1

 

3

2

2

1

 

+5V+5VSB (Default)

P4S333

P4S333 Keyboard Power Setting

2-18

Chapter 2: Hardware information