Product manual

DIP switches

A 8-position DIP switch, S1, located next to the PMC connectors, is used to configure certain features of

the adapter in accordance with the following table: To set any of the switch positions to ON push the slider

toward the ON printed on the body of the switch..

Switch OFF function ON function Description

1 BC chipset use the

internal clock

No function. Always use the off setting the on

setting was for earlier versions on the

bridge chip.

2 No function No function Not connected.

3 M66EN is grounded or

pulled up to 3.3V by the

PMC card.

Forces 33MHz PCI bus

operation, by grounding

M66EN

Forces PCI bus operation at 33MHz

when ON. Normally off.

4 25/50/100 MHz PCI-X

capability

33/66/133 MHz PCI-X

capability

Selects bus clock. Set to the normal

PCI speeds.

5 XCAP mode selected by

PMC card.

Forces standard PCI

mode, PCI-XCAP is

Grounded.

Forces operation to standard PCI when

6 Does not tie XCAP to

10K resistor, mode

selected by PMC card

Puts a 10K resistor in

parallel with XCAP

reducing bus speed from

133MHz to 66MHz for

PMC-X mode.

Reduces PMC-X mode speeds.

7 No Function No Function Leave in the off position.

8 Not used. Normal mode no JTAG on

the bridge chip

The bridge chip is not in JTAG mode

when this switch is on

Table 1 - DIP switch S1 settings

Table entries in GREY indicate factory default setting.