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Distributor of VersaLogic Corporation: Excellent Integrated System Limited
Datasheet of VL-CBR-2012 - 20" 24-BIT LVDS CABLE
Contact us: sales@integrated-circuit.com Website: www.integrated-circuit.com
USB Interface
Connector J7 includes interfaces for three USB ports (USB0-2). Four additional USB channels
(USB3-6), are available on the SUMIT-A connector at J2. The USB interface on the VL-EPMs-
21 is UHCI (Universal Host Controller Interface) and EHCI (Enhance Host Controller Interface)
compatible, which provides a common industry software/hardware interface. On the VL-CBR-
5012 breakout board there are two Type A USB connectors and one Type B USB connector.
One of the on-board USB ports (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 Ocelot can
appear as a USB mass storage device to a standard Windows XP workstation.
Programmable LED
Connector J7 includes an output signal for a programmable LED. Connect the cathode of the
LED to J7 pin 37; connect the anode to +5V. A 300Ω 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
M O V
D X , 1 D 0 H
I N
A L , D X
O R
A L , 8 0 H
O U T
D X , A L
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 J7 includes a speaker output signal at pin 38. The VL-CBR-5012 breakout board
provides a Piezo electric speaker.
Pushbutton Reset
Connector J7 includes an input for a pushbutton reset switch. Shorting J7 pin 40 to ground causes
the VL-EPMs-21 to reboot (hardware warm reset: power is not removed).
VL-EPMs-21 Reference Manual
LED Off
M O V
D X , 1 D 0 H
I N
A L , D X
A N D
A L , 7 F H
O U T
D X , A L
Interfaces and Connectors
38
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