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SONY™
CXD1160AP/AQ
K-RAM
Coefficient
RAM
(K-RAM)
built-in
CXD1160AP/AQ.
is
composed
of
I6bit
x 64
word
(address
to
address
63).
Single precision
coefficient
1w
(16b),
double
precision
coefficient
are
expressed by
2w
(32b)
in
succession,
and can
coexist
on
K-RAM.
In
the operation
system
both are
complement
on
2
and
MSB
can be handled as
1
>
K
>
-
1
at
Sign
bit.
KsHt,*+£ Z'%,.
K<h-K>,
+ I
2-'K,i-,
Coefficient transfers
from
the
exterior
in
the
microcomputer
interface
K
mode
the required
successive 2 addresses
(32b)
at
one
time.
As
there
is
also
inside
the execution
command
a
command
that
serves
to write
in
K-RAM, one
part
can be
used
as a temporary
register.
At
Power
ON
K-RAM
contents are undetermined.
Referring
to
the
fig
on
the
right
the storage
position
can be
defined
as
follows.
-
When
m
address singe
Drecisior
is
specified,
the single
precision
coefficient
Ks
in
m
address can be
used.
When
n
address double
precision
is
specified,
the
double
precision
coefficient
kd
in
n
address
n9
address
1
can be
used.
Here
low
word
Ki_
is
stored
in
n
address and
high
word Kh
is
stored
in
n©
1
address.
16
b
~
><
m
Ks
64
n
n®1
kd
W
"
K-RAM
address
specify
can be mentioned
in
the
command
that actually
handles
K-RAM.
There
are
2
types
of
K-RAM
address
specify
absolute
address
specify
and
relative
address
specify.
Absolute adderss
specify
Absolute
address->addr
Relative
address
specify
addr©relative
address-^addr
During
commands
that
do
not
handle
K-RAM.
ihe
present
address add:
dees
not
change.
(addr-jaddr)
At the forced
address
jump
every sampling
cycle, reset
is
executed
to
addr=0. Accordingly
and
for
the
first
time
only,
both the absolute
address
specify
and
relative
address
specify indicate the
same
physical address.
When
double
precision
command
is
utilized
with addr,
after
the
command
execution,
addr+f->addr
is
obtained.
Note
that
the
present address obtained
is
1
increment over
that of
the
address
specified
from
the
user
side,
Address 63 and address
are
ring
addresses,
(06-1=63,
63®1=0)
As
a
total
of
2 cycles, the
last
cycle
of
the
sampling
section
and
the cycle before
that,
are
coefficient transfer
sections,
K-RAM
cannot
be
utilized.
-
I16-
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