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SONY,
cxdii6oapiao
D-RAM
Data
RAM(D-RAM)
built-in
CXD1160AP/AQ
is
organized
in
16
bit
x 64
word
(address
to
address
63).
Single precision data
is
indicated
in
1W
(16b)
and
double
precision
data
at
a
32
address
distance
in
2W
(32b).
Both
can be
disposed
on
D-RAM.
For operations both are
used
with
complement
on
two.
MSB
is
at
Sign
Bit to
be handled as 1>Dg-1.
D-RAM
contents
is
unspecified
at
Power
On.
Ds-D.^I
2"0i
.-
Dd=-D..-i-S
2"
,
D*,-
Referring
to
the
fig.
on
the
right
the storage
position
can be
defined
as
follows.
•
When
m
address
single precision
is
specified, single
precision
data
Ds
can be
used.
•
When
n
address double
precision
is
specified,
double
precision
data
Dd
in
n
©
address 32 can be
used.
Here
high
word Dh
is
stored
in
n
address and
low
word
Dt
in
n
9
address
32.
16b
r
—
i
m
Ds
n
\
>Dd
n@32
I
64
W
DRAM
address
specification
by
users
is
a
logical
address
and
not
a
physical one.
Inside the IC
there
is
a 6
bit
ring,
address
counter
that
is
incremented every
I/O
sampling.
The
logical
address addr which
is
modulo added
to this
counter value
DAC
because
the physical
address.
Physical
address=DAC
©
addr
Example)
Logical
address
is
assigned
to
the respective
data
in
the
formula
at
right.
If
y(n)
is
entered
in
addr=3
and
X(n)
in
addr=1
then
y(n-1)
is
constantly
in
addr=2
and
X(n-1)
in
addr=Q
formula: y(n)=k,y(n-])
+
kiX(n)+k
s
X(ii-n
t
t
1
addr:
3
2
10
hysical
address^
4
3
2
1
DAC=0
n
vCn)
yCn-1)
KiO
Kn-1)
DAM
r.
+
l
-n
yCr.;
y(n-I)
Ke)
X(n-l)
X(n-2)
I
D-RAM
address
specify
can be mentioned
in
the
command
that actually
handles
D-RAM.
There
are
2
types
of
address
specify,
absolute
address
specify
and
relative
address
specify.
•
Absolute address
specify
Absolute address
-»
addr
•
Relative
address
specify
addr
©
relative
address
->
addr
With
commands
where
there
is
no
D-RAM
address
specify,
the present
address addr remains
unchanged,
(addr -+
addr).
Reset
to
addr=0
is
effected
at
address 10
forable
jump
every sampling
cycle.
Accordingly
and
for
the
first
time
only,
absolute
address
specify
and
relative
address
specify indicate the
same
logical
address.
Address 63 and address
are
ring
addresses (0©-1=63,
63©1=0)
Note
that
double
precision
data low
word
side
is
far
away
to
determine
all
the
data
location.
The
last
cycle
in
the
sampling
section
is
a
command
transfer
section
and
commands
cannot be
executed
117
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