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CPLD Control and Status Registers 59
3.2.28 Timer 3 IRQ Clear (T3IC, 0x632)
The
Timer
3
IRQ
Clear
(T3IC)
register
is
used
to
clear
an
interrupt
caused
by
Timer
3.
Writing
to
this
register,
located
at
offset
0x32
from
base
I/O
address
0x600,
causes
the
interrupt
from
Timer
3
to
be
cleared.
This
can
also
be
done
by
writing
a
ʺ
0
ʹ
to
TCSR3[7].
The
T3IC
register
is
write
only
and
the
data
written
is
irrelevant.
3.2.29 Timer 4 IRQ Clear (T4IC, 0x633)
The
Timer
4
IRQ
Clear
(T4IC)
register
is
used
to
clear
an
interrupt
caused
by
Timer
4.
Writing
to
this
register,
located
at
offset
0x33
from
base
I/O
address
0x600,
causes
the
interrupt
from
Timer
4
to
be
cleared.
This
can
also
be
done
by
writing
a
ʺ
0
ʺ
to
TCSR4[7].
The
T4IC
register
is
write
only
and
the
data
written
is
irrelevant.
3.2.30 CPLD GPIO LPC Interface Access Port and General
Configuration Registers
The
SBC622
provides
eight
lines
of
General
Purpose
I/O
through
the
P4/P6
connector.
The
lines
are
able
to
tolerate
5V
input
voltages
and
the
signals
are
isolated
whenever
the
SBC622
is
powered
down.
Figure 3-2 CPLD GPIO Interface Access
The
GPIO
signals
are
sourced
from
the
CPLD
and
any
reset
clears
all
output
pins
to
inputs.
To
prevent
GPIO
output
pins
glitching
during
board
reset,
the
GPIO
Out
Register
(offset
0x640)
is
only
reset
on
power
‐
up.
Always
write
this
register
before
enabling
GPIO
output
pins.
Under
software
control,
each
GPIO
signal
can
be
used
to
generate
an
interrupt
to
the
CPU
on
either
level,
either
edge
or
both
edges
(see
the
GPIO
Registers).
All
GPIO
interrupts
are
connected
to
the
PCH
via
the
SERIRQ
(Serial
Interrupt
Request)
signal
and
appear
to
the
Interrupt
Handler
as
IRQ5.
When
using
level
interrupts,
the
PCH
interrupt
(IRQ5)
also
needs
to
be
set
to
level
sensitive.
The
GPIO
interrupt
using
the
SERIRQ
signal
means
that
the
maximum
update
of
the
GPIO
interrupt
to
the
Interrupt
Handler
is
around
2.25
μ
S.
If
the
time
that
the
ISR
takes
to
write
to
the
GPIO
Interrupt
Status
Register
(0x640)
to
clear
the
interrupt
and
return
from
the
interrupt
routine
is
very
short
(<2.25
μ
S),
then
it
is
possible
to
receive
spurious
GPIO
interrupts.
Max 5 V
4K7
Onboard
Logic
(CPLD)
PWROK
Isolator
VPX
Connector
Содержание OpenVPX VPXcel6 SBC622
Страница 2: ...Document History Hardware Reference Document Number 500 9300527818 000 Rev B March 18 2011 ...
Страница 30: ...30 SBC622 Hardware Reference Manual Figure 1 2 SBC622 in Chassis VPX Backplane SBC622 inserted into Chassis ...
Страница 33: ...Installation and Setup 33 Figure 1 3 PMC Installed onto 2 PMC Site Model F ...
Страница 37: ...Installation and Setup 37 Figure 1 5 Front Panel SBC622 Isometric View Convection cooled F F ...