44 SBC330 3U VPX Single Board Computer
Publication No. SBC330-0HH/3
Figure 5-5 SBC330 Interrupts
5.10.8 PCI Interrupts
PCI
Express
provides
a
mechanism
for
passing
interrupts
from
legacy
PCI
devices
through
the
PCI
Express
fabric
to
the
interrupt
controller
at
the
Root
Complex,
using
Assert_INTx
and
Deassert_INTx
messages.
These
messages
are,
however,
subject
to
the
same
latency
and
non
‐
determinism
as
any
other
PCI
Express
packet.
To
reduce
this
latency,
the
SBC330
takes
the
interrupts
from
the
USB
controller
and
mezzanines
and
routes
them
directly
to
the
interrupt
controller,
via
the
Local
Bus
Control
FPGA,
bypassing
the
fabric
altogether.
5.11 Power Management
5.11.1 Processor
All
power
management
features
of
the
processing
cores,
such
as
the
programmable
power
states
(Doze,
Nap
and
Sleep),
Dynamic
Power
Management,
Instruction
Cache
Throttling
and
Dynamic
Frequency
switching,
are
available
to
the
software
within
the
8641D.
No
external
hardware
support
is
required.
5.11.2 PCI Express
All
PCI
Express
links
support
several
power
management
features
that
are
under
software
control
and
require
no
hardware
support.
The
SBC330
does
not
support
the
WAKE*
signal
and
recovery
from
a
D3COLD
state
under
auxiliary
power.