Utility Connector; Keyboard/Mouse Interface; Programmable Led - VersaLogic VSBC-8 Reference Manual

Utility Connector

Utility Connector
K /M
EYBOARD OUSE
A standard PS/2 keyboard and mouse interface is accessible through connector J13. In addition,
connector J13 supports a programmable LED output, hard drive activity LED, and a speaker
output as shown in the table below. The pinout of the PS/2 connectors applies to use of the
VersaLogic transition cable #VL-CBL-1602.
P
ROGRAMMABLE
The Utility Connector J13 includes an output signal for attaching a software controlled LED.
Connect the cathode of the LED to J13 pin 3, connect the anode to +5V. An on-board resistor
limits the current to 15 mA when the circuit is turned on.
To turn the LED on and off, set or clear bit D7 in I/O port 0E0h (or 1E0h). When changing the
register, make sure not to alter the value of the other bits.
The following code examples show how to turn on and off the LED. Refer to page 48 for further
information:
LED On
in al,E0h
or al,80h
out E0h,al
Note! The LED is turned on by the BIOS during system startup. This causes the light to
function as a "power on" indicator if it is not otherwise controlled by user code.
26 – Reference
I
NTERFACE
Table 9: Utility Connector
J13 Signal
Pin Name
1 PBRST*
2 GND
3 PLED*
4 MKPWR
5 SPKO*
6 MKPWR
7 IDE_LED*
8 MKPWR
9 MKPWR
10 XMSDATA
11 GND
12 MSCLK
13 MKPWR
14 KBDATA
15 GND
16 KBCLK
LED
LED Off
in al,E0h
and al,7Fh
out E0,al
Description
Push-button reset
Ground

Programmable LED

Protected +5V
Speaker Output
Protected +5V
IDE Drive Indicator LED
Protected +5V
Protected +5V
Mouse Data
Ground
Mouse Clock
Protected +5V
Keyboard Data
Ground
Keyboard Clock
PS/2
Pin
4
1
Mouse
Connector
3
5
4
1 Keyboard
Connector
3
5
VSBC-8 Reference Manual