52 PCIE-5565PIORC Reflective Memory Board
Bits
21
and
20:
Config
1
and
Config
0
–
These
two
bits
indicate
the
installed
memory
size
as
defined
in
the
following
table.
The
two
bits
are
read
‐
only.
Bit
18:
Delay
TX
from
PCI
Write
–
When
this
bit
is
set
high
(1),
the
board
is
operating
with
reduced
PCI
write
bandwidth.
This
bit
is
read
‐
only.
This
mode
is
enabled
by
setting
switch
S1
position
2
in
the
ON
position.
Data
received
on
the
PCI
bus
will
be
delayed
before
it
is
written
to
memory
or
transmitted
on
the
network.
This
prevents
the
node
from
using
full
network
bandwidth.
This
setting
is
normally
OFF.
Bits
17
and
16:
Offset
1
and
Offset
0
–
When
the
host
PCI
system
writes
to
the
onboard
memory
and
initiates
a
packet
over
the
network,
Offset
1
and
Offset
0
will
apply
an
offset
to
the
network
address
as
it
is
sent
or
received
over
the
network.
The
offset
does
not
appear
on
local
access
to
the
memory,
and
the
offset
does
not
alter
network
packets
as
they
pass
through
the
board.
Offset
1
and
Offset
0
provide
four
possible
binary
increments
of
64
MByte
each
through
the
256
MByte
network
address
range.
When
the
address
and
offset
exceeds
the
256
MByte
network
address
range,
the
address
bits
beyond
256
MByte
will
be
truncated.
This
causes
the
write
to
wrap
around
into
a
lower
memory
location.
Offsets
1
and
0’s
bits
correspond
to
the
network
address
bits
A27
and
A26
respectively.
Window 1
Window 0
PCI PIO Window Size
0
0
default = installed memory size
0
1
64 MByte
1
0
16 MByte
1
1
2 MByte
Config 1
Config 0
Memory Size
0
0
64 MByte
0
1
128 MByte
1
0
256 MByte
1
1
Reserved
Offset 1
Offset 0
Offset Applied
0
0
$0
0
1
$4000000
1
0
$8000000
1
1
$C000000