Embedian, Inc.
166
SMARC-iMX8MM Computer on Module User’s Manual
v. 1.2
4.6.2.
Carrier/Off
‐
Module
Terminations
The
following
Carrier
terminations
are
required,
if
the
relevant
interface
is
used.
If
unused,
the
SMARC
Module
pins
may
be
left
un
‐
connected.
Module
Signal
Group
Name
Carrier
Series
Termination
Carrier
Parallel
Termination
Notes
GBE_MDI
Magnetics
module
appropriate
for
10/100/1000
GBE
transceivers
Secondary
side
center
tap
terminations
appropriate
for
Gigabit
Ethernet
implementations
GBE_LINK
(GBE
status
LED
sinks)
If
used,
current
limiting
resistors
and
diodes
to
pulled
to
a
positive
supply
rail
The
open
drain
GBE
status
signals,
GBE_LINK100#,
GBE_LINK1000#
and
GBE_LINK_ACT#,
if
used,
need
Carrier
based
current
limiting
resistors
and
LEDs.
The
LED
may
be
integrated
into
a
Carrier
RJ45
jack.
A
resistor
of
68
ohms,
and
a
LED
with
the
anode
tied
to
Carrier
3.3V,
is
typical.
LVDS
LCD
100
ohm
resistive
termination
across
the
differential
pairs
at
the
endpoint
of
the
signal
path,
usually
on
the
display
assembly
