Interfaces and Connectors
EPM-14 Reference Manual
29
USB
The USB interface on the EPM-14 is OHCI (Open Host Controller Interface) and EHCI (Enhance
Host Controller Interface) compatible, which provides a common industry software/hardware
interface. The EHCI controller is still available for use by the operating system when the “Usb20”
feature is disabled, but booting from USB 2.0 devices or using them in a DOS environment may
be slower.
The USB controllers use PCI interrupt INTD#. CMOS Setup is used to select the IRQ line routed
to each PCI interrupt line.
There are four USB ports, all connected through the utility I/O connector at J7. The CBR-5011
breakout board provides four USB type-A connectors at location J2, and an alternate 4-pin
connection for USB4 at location J5.
Table 9: USB Pinout – CBR-5011 Connector J2
Pin
Signal Name
Function
1 USBPxPWR
+5V
(Protected)
2 USBPx– Data
–
3 USBPx
+
Data
+
4 GND
Ground
Table 10: USB Pinout – CBR-5011 Connector J5
CBR-5011
J5 Pin
Signal
Name
Function
1 USBP4PWR
+5V
(Protected)
2 –
No
connect
3
USBP4–
Channel 4 Data –
4 –
No
connect
5
USBP4+
Channel 4 Data +
6 –
No
connect
7 GND Cable
Shield
8 –
No
connect
9 –
No
connect
10 IDE_LED
IDE
LED
These connectors use IEC 61000-4-2-rated TVS components to help protect against ESD damage.