# Configuring the DIP switches

The CG 6565C DIP switches are located on the board. The following illustration shows the DIP switches set at their default settings. For the S4 DIP switch, all switches are OFF. For the S3 DIP switch, switch 1 and switch 2 are ON, and switches 3 through 8 are OFF.

## S3 DIP switch

Switch 5 in the S3 DIP switch allows you to control if the board LEDs can be off or on. This is known as the dark office feature. By default, switch 5 is set to OFF (all LEDs can be on). Setting switch 5 to ON turns off all LEDs on the board unless there is an error.

Note: It is important to leave all switch settings at their default. The only switch that can be modified is switch 5. Do not modify this setting unless you are using the dark office feature. Other than switch 5, do not modify any of the switch settings on the S3 DIP switch.

## S4 DIP switch

DIP switch S4 enables you to hot swap the CG 6565C into an older CompactPCI chassis. By default, the eight switches of DIP switch S4 are set to the OFF position. S7 must be set to 0 (zero). For normal board operations do not modify any of the S4 switch settings.

When switches M66 and PCIX are in the OFF position, the board is compliant with the CompactPCI Hot Swap Specification PICMG 2.1 R2.0. The board polls M66EN# and PCIXCAP# signals on the backplane during a Hot Swap insertion.

To hot swap the CG 6565C board into an older CompactPCI chassis that does not comply with the CompactPCI Hot Swap Specification PICMG 2.1 R2.0 requirements for PCIXCAP# and M66EN#, change switch M66 and switch PCIX to the ON position. Some older CompactPCI chassis do not have M66EN# and PCIXCAP# implemented correctly causing these signals to be high, even though the bus is not running PCI-X at 66 MHz. When switch M66 and switch PCIX are in the ON position, the board ignores M66EN# and PCIXCAP#. The board then boots, regardless of the state of the bus.

Caution: | Use caution when setting switch M66 and switch PCIX to the ON position. Setting these switches to the ON position causes the CG 6565C board to be non-compliant with the Hot Swap specification. The board can disrupt the PCI bus if it is hot swapped into a system with the bus segment running at PCI-X or at the wrong speed.