Cradlepoint USB-Host to Ethernet Adapter PS6U1UHE Manual do Utilizador Página 10
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US
7,984,226
B2
7
USB
signals,
and
later
generates
a
second
set
of
?rst
input
signals
to
pass
the
USB
data
signals
from
the
?rst
set
of
USB
signals
or
the
second
set
of
USB
signals
to
the
output
connector,
Wherein
the
USB
supply
voltage
detection
circuitry
includes
a
?rst
node
that
changes
from
one
of
a
high
voltage
state
or
loW
voltage
state
to
the
other
of
the
high
voltage
state
or
loW
voltage
state
if
there
is
a
change
in
the
USB
supply
voltage
present
on
the
USB
connector,
said
?rst
node
coupled
to
said
?rst
and
second
set
of
input
signals,
Wherein
the
USB
supply
voltage
detection
circuitry
includes
a
delay
circuit
With
an
input
coupled
to
the
?rst
node
and
an
output
coupled
to
a
?rst
of
said
?rst
input
signals,
Wherein
the
delay
circuit
includes
delay
stages
Wherein
an
output
of
a
?rst
delay
stage
is
a
second
of
the
?rst
input
signals
and
the
one
or
more
second
input
signals,
and
an
output
of
a
last
delay
stage
is
the
?rst
of
said
?rst
input
signals.
2.
The
routing
circuitry
set
forth
in
claim
1
Wherein
the
USB
supply
voltage
at
the
output
connector
is
isolated
from
both
of
the
USB
supply
voltages
of
the
?rst
and
second
USB
signals
if
the
output
of
the
last
delay
stage
is
at
one
or
a
high
or
loW
voltage
level.
3.
The
routing
circuitry
set
forth
in
claim
1
Wherein
the
?rst
stage
of
the
delay
circuit
?lters
contact
bouncing
that
may
occur
When
the
manual
sWitch
is
changed
from
one
position
to
another.
4.
The
routing
circuitry
set
forth
in
claim
1
Wherein
the
delay
circuit
comprises
a
plurality
of
RC
delay
stages.
5.
Routing
circuitry
for
routing
either
a
?rst
set
of
USB
signals
derived
from
an
Ethernet
local
area
netWork
(LAN)
at
an
Ethernet
connector
or a
second
set
of
USB
signals
derived
from
a
USB
host
at
a
USB
connector
to
an
output
connector
Which
can
interface
With
a
data
processing device
compris
mg:
a)
USB
supply
voltage
selection
circuitry
that
passes
a
USB
supply
voltage
from
the
?rst
set
of
USB
signals,
or
the
second
set
of
USB
signals,
or
isolates
the
USB
sup
ply
voltages
from
the
?rst
and
second
set
of
USB
signals
from
the
output
connector
in
response
to
tWo
or
more
?rst
input
signals;
b)
USB
data
selection
circuitry
that
passes
USB
data
sig
nals
from
the
?rst
set
of
USB
signals
or
the
second
set
of
USB
signals
to
the
output
connector
in
response
to
one
or
more
second
input
signals;
and
20
25
30
35
45
8
c)
USB
supply
voltage
detection
circuitry
that
detects
if
the
USB
supply
voltage
to
the
output
connector
is
from
one
of
the
?rst
or
second
set
of
USB
signals,
and
generates
the
tWo
or
more
?rst
input
signals
and
the
one
or
more
second
input
signals
in
response
to
the
detection;
d)
Wherein
the
USB
supply
voltage
detection
circuitry
generates
a
?rst
set
of
?rst
input
signals
Which
isolates
the
USB
supply
voltages
from
the
?rst
and
second
set
of
USB
signals
from
the
output
connector
When
the
USB
supply
voltage
from
one
of
the
?rst
and
second
set
of
USB
signals
changes
to
the
other
of
the
?rst
and
second
set
of
USB
signals,
and
later
generates
a
second
set
of
?rst
input
signals
to
pass
the
USB
data
signals
from
the
other
of
the
?rst
set
of
USB
signals
or
second
set
of
USB
signals
to
the
output
connector,
Wherein
the
USB
supply
voltage
detection
circuitry
includes
a
?rst
node
that
changes
from
one
of
a
high
voltage
state
or
loW
voltage
state
to
the
other
of
the
high
voltage
state
or
loW
voltage
state
if
a
manual
sWitch
is
in
a
?rst
position
and
if
there
is
a
change
in
the
USB
supply
voltage
present
on
the
USB
connector,
said
?rst
node
coupled
to
said
?rst
and
second
set
of
input
signals,
and
does
not
change
voltage
states
irregardless
of
the
USB
supply
voltage
present
on
the
USB
connector
if
the
manual
sWitch
is
not
in
the
?rst
position,
Wherein
the
USB
supply
voltage
detection
circuitry
includes
a
delay
circuit
With
an
input
coupled
to
the
?rst
node
and
an
output
coupled
to
a
?rst
of
said
?rst
input
signals,
Wherein
the
delay
circuit
includes
delay
stages
Wherein
an
output
of
a
?rst
delay
stage
is
a
second
of
the
?rst
input
signals
and
the
one
or
more
second
input
signals,
and
an
output
of
a
last
delay
stage
is
the
?rst
of
said
?rst
input
signals.
6.
The
routing
circuitry
set
forth
in
claim
5
Wherein
the
USB
supply
voltage
at
the
output
connector
is
isolated
from
both
of
the
USB
supply
voltages
of
the
?rst
and
second
USB
signals
if
the
output
of
the
last
delay
stage
is
at
one
or
a
high
or
loW
voltage
level.
7.
The
routing
circuitry
set
forth
in
claim
5
Wherein
the
?rst
stage
of
the
delay
circuit
?lters
contact
bouncing
that
may
occur
When
the
manual
sWitch
is
changed
from
one
position
to
another.
8.
The
routing
circuitry
set
forth
in
claim
5
Wherein
the
delay
circuit
comprises
a
plurality
of
RC
delay
stages.
* * * * *
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