Specifications

PCA-6176 User's Manual

1.8 Jumper Settings

This section provides instructions on how to configure your card by

setting jumpers. It also includes the card's default settings and your

options for each jumper.

1.8.1 How to set jumpers

You configure your card to match the needs of your application by

setting jumpers. A jumper is the simplest kind of electric switch. It

consists of two metal pins and a small metal clip (often protected by a

plastic cover) that slides over the pins to connect them. To “close” a

jumper you connect the pins with the clip. To “open” a jumper you

remove the clip. Sometimes a jumper consists of a set of three pins,

labeled 1, 2 and 3. In this case you connect either pins 1 and 2,

or 2 and 3.

A pair of needle-nose pliers may be useful when setting jumpers.

1.8.2 CPU clock ratio setting (SW1)

You must configure your PCA-6176 CPU card to the frequency of

your Intel Pentium

II/III processor by setting jumper SW1. The

PCA-6176 SW1 is equpped to use Pentium processors with speeds of

233, 266, 300, 333, 350, 400, 450, and 500 MHz. Configure your

PCA-6176 as follows:

Table 1-3: CPU clock ratio setting (SW1)

CPU freq. Ratio Bus clk SW1-1 SW1-2 SW1-3

233 MHz 3.5 66 MHz ON ON ON

266 MHz 4 66 MHz OFF OFF OFF

300 MHz 4.5 66 MHz OFF OFF ON

333 MHz 5 66 MHz OFF ON OFF

366 MHz 5.5 66 MHz OFF ON ON

350 MHz 3.5 100 MHz ON ON ON

400 MHz 4 100 MHz OFF OFF OFF

450 MHz 4.5 100 MHz OFF OFF ON

500 MHz 5 100 MHz OFF ON OFF

550 MHz 5.5 100 MHz OFF ON ON

Note: SW1-4 is factory reserved.