IBM BDM-610000049 Mouse, System Reset, Soft Power Button, Keyboard Connector Pins CN5

Keyboard

A PS/2 compatible keyboard can be connected to the multi-function connector. Usually PC keyboards come with a cable ending with a 5-pin male PS/2 connector. Table 9 lists the relationship between the multi-function connector pins and a standard PS/2 keyboard connector.

Table 9 Keyboard Connector Pins (CN5)

Pin	Signal	Function	PS/2
5	KBD	Keyboard Data	1
6	KBC	Keyboard Clock	5
7	GND	Ground	3
2	PWR	Keyboard Power (+5 V)	4

To ensure correct operation, check that the keyboard is either an AT compatible keyboard or a switchable XT/AT keyboard set to AT mode. Switchable keyboards are usually set by a switch on the back or bottom of the keyboard.

Mouse

A PS/2 compatible mouse can be connected to the multi-function connector. Table 10 lists the relationship between the multi-function connector pins and a standard PS/2 mouse connector.

Table 10 Mouse Connector Pins (CN5)

Pin	Signal	Function	PS/2
10	MSD	Mouse Data	1
8	MSC	Mouse Clock	5
7	GND	Ground	3
2	PWR	Keyboard Power (+5 V)	4

System Reset

Pin 3 of the multi-function connector allows connection of an external push-button to manually reset the system. The push-button should be normally open, and connect to ground when pushed.

Soft Power Button

Pin 4 of the multi-function connector allows connection of an external push-button to send a soft power signal to the system. The push-button should be normally open, and connect to ground when pushed. For more information on the modes of the Soft Power Button, refer to the Power Management section in Chapter 4, Using the cpuModule.

BDM-610000049 Rev G Chapter 3: Connecting the cpuModule 29