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USB C
M
LIENT
One of the USB channels (USB2) can be configured in CMOS Setup to operate in Host or Client
mode. When operated in Client mode, USB2 can operate as a USB networking or a USB mass
storage device when connected to an external host computer. In other words, the Tiger can
appear as a USB mass storage device to a standard Windows XP workstation. When operated in
Host mode, external USB power must be provided for any device attached via the USB Type B
(J7) connector on the VL-CBR-5012.
Programmable LED
Connector J4 includes an output signal for a programmable LED. Connect the cathode of the
LED to J4 pin 37; connect the anode to +5V. A 330 Ohm on-board resistor limits the current to
15 mA when the LED is shorted. A programmable LED is provided on the VL-CBR-5012
breakout board. The programmable LED is the top LED at position D1.
To turn the LED on and off, set or clear bit D7 in I/O port 1D0h. When changing the register,
make sure not to alter the value of the other bits.
The following code examples show how to turn the LED on and off.
LED On
MOV
DX,1D0H
IN
AL,DX
OR
AL,80H
OUT
DX,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.
The BIOS also flashes the LED in sync with "Beep Codes" when an error occurs.
Internal Speaker
Connector J4 includes a speaker output signal at pin 38. The VL-CBR-5012 breakout board
provides a Piezoelectric speaker.
Pushbutton Reset
Connector J4 includes an input for a pushbutton reset switch. Shorting J4 pin 40 to ground
causes the VL-EPM-24 to reboot (this is a hardware warm reset in which power is not removed).
VL-EPM-24 Reference Manual
ODE
LED Off
MOV
IN
AND
OUT
DX,1D0H
AL,DX
AL,7FH
DX,AL
Interfaces and Connectors
36
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