To determine
the physical
location on the board of a particular
jumper
area, refer to the asse~~ly drawing near the end of this ~nual.
2.1
Board addressing
'!be Bitstreamer
II occupies
eight I/O addresses.
They are x2 to x9 where
x can be any digit between 0 and 7.
(Note that
all
I/O
addresses
in this
manual
are
given
in hexadecimal
notation,
which is base 16.)
The lowest
address assigned
to a Bitstreamer
II board
is called
its
"base
addr:ess.
n
For
example,
if a board's
base
address
is 02,
the board
occupies
I/O
addresses 02 - 09.
Thus,
in this exa~ple, I/O addresses
00, 01, and 10 - FF
are available
for other boards in tl1esystem to use.
Since x can be any digit between 0 and 7, the lowest base
address
is 02
and
there
are eight allowed base addresses: 02, 12, 22, 32, 42, 52, 62, and
72.
It should be clear that the left hand digit of the base address will be
the same
as the
left hand digit of each of the board's I/O addresses.
For
example, if the base address
is 42, the board occupies
I/O
addresses
42 -
49.
You determine
what
base
address
a particular
board
has
by soldering
jumpers
in Area
'N,
which
is labeled
"Address Select" on the board itself.
/
Rather than giving names to the pads within Area W, t.l-te
board
gives
a name
to each ~
of pads.
The names given are WI, W2, W3, W4,
W5,
and W6.
To
specify
any given
base address, you connect one or more of ~,ese pairs, as
specified
by
t.'1e
x marks in Table
1,
below.
Fi rst check
the back
side
of
the board,
where
some
of
these
connections
may already be made
by
way of
metallic
traces or previously
installed jumpers.
Cut the traces and jumpers
that are not needed, and solder on jumpers that ~
needed, as per Table
1:
Summary of Contents for Bitstreamer II
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