SoM-A5D36 User Manual
Revision 1.30 © 2015
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2.4.5
USB
The SoM 200-pin specification provides for 2 USB hosts and 1 USB device or OTG (On-The-GO) port. The
SoM-A5D36 does provide a USB OTG-like port. EMAC has mapped this port to both Host A and Device A
ports. This allows the port to be used as a Full time Host port by connection to Host A or for a full time
Device port by connection to device Port A. The use of Port A also allows for USB OTG in conjunction with
VBUS and ID signals. There is a GPIO line that can be utilized to enable USB power if necessary. This is SoM
pin# 125, GPIO11 and is not required if power will always be on. Remember the USB Data lines are
differential pairs and need to be routed as such.
Table 7: USB
SODIMM
Pin#
SoM
Pin Name
Processor
Pin Name(s)
Port Line
Description
5
HHSD2_P
N/A
Host USB 2.0 PortB +
7
Host_A-
HHSD2_N
N/A
Host USB 2.0 PortB -
6
HHSD3_P
N/A
Host USB 2.0 PortC +
8
Host_B-
HHSD3_N
N/A
Host USB 2.0 PortC -
9
Host/Device/OTC_C-
H/D_HSD1_N
N/A
OTG USB 2.0 PortA -
11
Host/Device/OTG_C+
H/D_HSD1_P
N/A
OTG USB 2.0 PortA +
10
USB_OTG_VBUS
PC27/SPI1_NPCS2/TWCK1
N/A
OTG VBUS
40
USB_OTG_ID
PC26/SPI1_NPCS1/TWD1
N/A
OTG ID
