© National Instruments
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1-5
NI sbRIO-9651 System on Module Carrier Board Design Guide
•
Limit the MDI trace lengths on the carrier board to 6.0 in. or less, which is the length at
which Ethernet compliance was tested.
USB (USB0, USB1)
The sbRIO-9651 SOM provides two USB 2.0-compliant ports for use on a carrier board:
USB Host/Device port (USB0) and USB Host port (USB1).
Note
Your carrier board design must provide the 5 V USB_VBUS power to
USB Host ports and must limit the current supplied to each host port according
to USB specifications.
USB0 Host/Device Signal Definitions
Table 1-5 describes the USB0 Host/Device port pins and signals on the sbRIO-9651 SOM
connector.
Table 1-5.
USB0 Host/Device Signal Definitions
Signal Name
Dedicated
SOM Pin #
Direction
*
I/O Standard
Description
USB0_DP
33
I/O
Defined by
USB
specification.
USB0 data pair.
USB0_DN
41
USB0_MODE
65
I
LVTTL
Controls whether the
USB0 port provides a
Host or Device
connection. Refer to the
section of this
chapter for more
information.
USB0_CPEN
73
O
LVTTL
USB0 over-current
protection enable.
USB0_VBUS
81
I
5 V tolerant
voltage sense
USB0 VBUS input.
Allows USB PHY to
sense if VBUS is
present on the
connector.
*
I/O direction is with respect to the sbRIO-9651 SOM.