<s>
The	O
Motorola	O
DSP56000	O
(	O
also	O
known	O
as	O
56K	O
)	O
is	O
a	O
family	O
of	O
digital	B-Architecture
signal	I-Architecture
processor	I-Architecture
(	O
DSP	O
)	O
chips	O
produced	O
by	O
Motorola	O
Semiconductor	O
(	O
later	O
Freescale	O
Semiconductor	O
then	O
NXP	O
)	O
starting	O
in	O
1986	O
with	O
later	O
models	O
are	O
still	O
being	O
produced	O
in	O
the	O
2020s	O
.	O
</s>
<s>
The	O
56k	O
series	O
was	O
quite	O
popular	O
for	O
a	O
time	O
in	O
a	O
number	O
of	O
computers	O
,	O
including	O
the	O
NeXT	B-Device
,	O
Atari	B-Device
Falcon030	I-Device
and	O
SGI	B-Device
Indigo	I-Device
workstations	B-Device
all	O
using	O
the	O
56001	O
.	O
</s>
<s>
Upgraded	O
56k	O
versions	O
are	O
still	O
used	O
in	O
audio	O
equipment	O
,	O
radar	B-Application
systems	I-Application
,	O
communications	O
devices	O
(	O
like	O
mobile	O
phones	O
)	O
and	O
various	O
other	O
embedded	B-Architecture
DSP	O
applications	O
.	O
</s>
<s>
The	O
56000	O
was	O
also	O
used	O
as	O
the	O
basis	O
for	O
the	O
updated	O
96000	B-General_Concept
,	O
which	O
was	O
not	O
commercially	O
successful	O
.	O
</s>
<s>
It	O
includes	O
two	O
24-bit	O
registers	B-General_Concept
,	O
which	O
can	O
also	O
be	O
referred	O
to	O
as	O
a	O
single	O
48-bit	O
register	O
.	O
</s>
<s>
It	O
also	O
includes	O
two	O
56-bit	O
accumulators	B-General_Concept
,	O
each	O
with	O
an	O
8-bit	O
"	O
extension	O
"	O
(	O
aka	O
headroom	O
)	O
;	O
otherwise	O
,	O
the	O
accumulators	B-General_Concept
are	O
similar	O
to	O
the	O
other	O
24/48	O
-bit	O
registers	B-General_Concept
.	O
</s>
<s>
Being	O
a	O
Modified	B-Device
Harvard	I-Device
architecture	I-Device
processor	O
,	O
the	O
56k	O
has	O
three	O
memory	O
spaces+buses	O
(	O
and	O
on-chip	O
memory	O
banks	O
in	O
some	O
of	O
the	O
models	O
)	O
:	O
a	O
program	O
memory	O
space/bus	O
and	O
two	O
data	O
memory	O
space/bus	O
.	O
</s>
<s>
In	O
most	O
designs	O
the	O
56000	O
is	O
dedicated	O
to	O
one	O
single	O
task	O
,	O
because	O
digital	O
signal	O
processing	O
using	O
special	O
hardware	O
is	O
mostly	O
real-time	B-General_Concept
and	O
does	O
not	O
allow	O
any	O
interruption	O
.	O
</s>
<s>
For	O
less	O
demanding	O
tasks	O
which	O
are	O
not	O
time-critical	O
,	O
designers	O
normally	O
use	O
a	O
separate	O
CPU	B-General_Concept
or	O
MCU	B-Architecture
.	O
</s>
<s>
The	O
addition	O
of	O
SIMD	B-Device
instructions	O
to	O
most	O
desktop	O
computer	O
CPUs	O
have	O
meant	O
that	O
dedicated	O
DSP	B-Architecture
chips	I-Architecture
like	O
the	O
56000	O
have	O
partly	O
disappeared	O
from	O
some	O
application	O
fields	O
,	O
but	O
they	O
continue	O
to	O
be	O
used	O
widely	O
in	O
communications	O
and	O
other	O
professional	O
uses	O
.	O
</s>
<s>
To	O
this	O
end	O
the	O
56800	O
series	O
added	O
a	O
complete	O
MCU	B-Architecture
which	O
created	O
a	O
single-chip	O
"	O
DSPcontroller	O
"	O
solution	O
,	O
while	O
the	O
opposite	O
occurred	O
in	O
the	O
68456	O
,	O
a	O
68000	B-Device
with	O
a	O
56000	O
on	O
it	O
.	O
</s>
<s>
A	O
still	O
quite	O
prevalent	O
model	O
of	O
the	O
56000	O
is	O
the	O
third	O
generation	O
56300	O
family	O
,	O
starting	O
with	O
the	O
56301	O
,	O
which	O
features	O
several	O
models	O
with	O
special	O
applications	O
hard	O
-	O
and	O
firmware	O
built-in	O
,	O
like	O
PCI	B-Protocol
interface	O
logic	O
,	O
CRC	O
processors	O
,	O
or	O
audio	O
companders	B-Algorithm
.	O
</s>
