Interfaces and Connectors
EPM-15 Reference Manual
30
USB
I
NTERFACE
Connector J8 includes interfaces for four USB ports. The USB interface on the EPM-15 is UHCI
(Universal Host Controller Interface) and EHCI (Enhance Host Controller Interface) compatible,
which provides a common industry software/hardware interface. There are four USB connectors
on the CBR-5010 breakout board.
BIOS Configuration
The USB controller can be enabled or disabled in the CMOS setup. The USB controller uses PCI
interrupt “INTD#”. The CMOS setup screen is used to select the IRQ line routed to each PCI
interrupt line.
P
ROGRAMMABLE
LED
Connector J8 includes an output signal for a software controlled LED. Connect the cathode of the
LED to J8 pin 44; connect the anode to +5V. An on-board resistor limits the current to 15 mA
when the circuit is turned on. A programmable LED is provided on the CBR-5010 breakout
board.
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. Refer to page 41 for further
information:
LED On
LED Off
MOV DX,1D0H
MOV DX,1D0H
IN
AL,DX
IN
AL,DX
OR
AL,80H AND AL,7FH
OUT DX,AL
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.
IDE
LED
Connector J8 includes an output signal for an IDE Activity LED. Connect the cathode of the LED
to J8 pin 46, and connect the anode to +5V. An on-board resistor limits the current to 15 mA
when the circuit is turned on. An IDE LED is provided on the CBR-5010 board.
I
NTERNAL
S
PEAKER
Connector J8 includes a speaker output signal at pin 48. The CBR-5010 breakout board provides
a Piezo electric speaker.
P
USH
-B
UTTON
R
ESET
Connector J8 includes an input for a push-button reset switch. Shorting J8 pin 50 to ground
causes the EPM-15 to reboot. This connector uses IEC 61000-4-2-rated TVS components to help
protect against ESD damage.
