EPM-19 Hardware Reference Manual
25
Multi-purpose I/O
USB
The USB interface on the EPM-19 is OHCI (Open Host Controller Interface) and EHCI
(Enhanced Host Controller Interface) compatible, which provides a common industry
software/hardware interface. The USB controller can be enabled or disabled in the BIOS Setup
utility. The board has four USB ports:
Two hub ports routed to the J9 user I/O connector. Table 11 page 30 lists the USB port
signals routed to the J9 user I/O connector.
Two additional non-hub ports are also routed to the J9 user I/O connector.
Note:
Some USB mass storage devices cause long delays or reboot cycles when formatted
as non-bootable FAT32 drives.
The USB interfaces at connector J9 are accessible using a CBR-4005B paddleboard or by using a
custom cable.
All four USB ports use IEC 61000-4-2-rated TVS components to protect against ESD damage.
PCIe Mini Card / mSATA
The socket at location J2 accepts a full-height PCI Express Mini Card or an mSATA module.
Note:
PCIe Mini Cards using small (512 byte or below) I/O address ranges may not be accessible.
The PCIe Mini Card interface includes one PCIe x1 lane, one hubbed USB 2.0 channel, and the
SMBus interface. The socket is compatible with plug-in Wi-Fi modems, GPS receivers, Flash
data storage, and other cards for added flexibility. For more information on PCIe Mini Cards
offered by VersaLogic, contact
To secure a Mini Card or mSATA module to the on-board standoffs, use two M2.5 x 6mm pan
head Philips nylon screws. These screws are available in quantities of 10 in the VL-HDW-108
hardware kit from VersaLogic.
Table 8: PCIe Mini Card / mSATA Pinout
J2
Pin
PCIe Mini Card
Signal Name
PCIe Mini Card
Function
mSATA
Signal Name
mSATA
Function
1
WAKE#
Wake
Reserved
Not connected
2
3.3VAUX
3.3V auxiliary source
+3.3V
3.3V source
3
NC
Not connected
Reserved
Not connected
4
GND
Ground
GND
Ground
5
NC
Not connected
Reserved
Not connected
6
1.5V
1.5V power
+1.5V
1.5V power
7
NC
Not connected
Reserved
Not connected
8
NC
Not connected
Reserved
Not connected
9
GND
Ground
GND
Ground
5