<s>
The	O
OpenRISC	B-Device
1200	I-Device
(	O
OR1200	B-Device
)	O
is	O
an	O
implementation	O
of	O
the	O
open	O
source	O
OpenRISC	B-Device
1000	O
RISC	B-Architecture
architecture	O
.	O
</s>
<s>
A	O
synthesizable	B-Device
CPU	I-Device
core	I-Device
,	O
it	O
was	O
for	O
many	O
years	O
maintained	O
by	O
developers	O
at	O
OpenCores.org,	O
although	O
,	O
since	O
2015	O
,	O
that	O
activity	O
has	O
now	O
been	O
taken	O
over	O
by	O
the	O
Free	O
and	O
Open	O
Source	O
Silicon	O
Foundation	O
at	O
the	O
website	O
.	O
</s>
<s>
The	O
Verilog	B-Language
RTL	O
description	O
is	O
released	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
.	O
</s>
<s>
The	O
IP	B-Architecture
core	I-Architecture
of	O
the	O
OR1200	B-Device
is	O
implemented	O
in	O
the	O
Verilog	B-Language
HDL	I-Language
.	O
</s>
<s>
The	O
implementation	O
specifies	O
a	O
power	O
management	O
unit	O
,	O
debug	O
unit	O
,	O
tick	O
timer	O
,	O
programmable	B-Architecture
interrupt	I-Architecture
controller	I-Architecture
(	O
PIC	O
)	O
,	O
central	O
processing	O
unit	O
(	O
CPU	O
)	O
,	O
and	O
memory	B-General_Concept
management	I-General_Concept
hardware	I-General_Concept
.	O
</s>
<s>
Peripheral	O
systems	O
and	O
a	O
memory	O
subsystem	O
may	O
be	O
added	O
using	O
the	O
processor	O
's	O
implementation	O
of	O
a	O
standardized	O
32-bit	O
Wishbone	B-Architecture
bus	I-Architecture
interface	O
.	O
</s>
<s>
The	O
OR1200	B-Device
is	O
intended	O
to	O
have	O
a	O
performance	O
comparable	O
to	O
an	O
ARM10	B-Architecture
processor	O
architecture	O
.	O
</s>
<s>
The	O
OR1200	B-Device
CPU	O
is	O
an	O
implementation	O
of	O
the	O
32-bit	O
ORBIS32	O
instruction	B-General_Concept
set	I-General_Concept
architecture	I-General_Concept
(	O
ISA	O
)	O
and	O
(	O
optionally	O
)	O
ORFP32X	O
ISA	O
implementing	O
IEEE-754	O
compliant	O
single	O
precision	O
floating	O
point	O
support	O
.	O
</s>
<s>
The	O
CPU	O
also	O
contains	O
a	O
MAC	B-Algorithm
unit	O
in	O
order	O
to	O
better	O
support	O
digital	B-Architecture
signal	I-Architecture
processing	I-Architecture
(	O
DSP	O
)	O
applications	O
.	O
</s>
<s>
The	O
OR1200	B-Device
design	O
uses	O
a	O
Harvard	B-Architecture
memory	I-Architecture
architecture	I-Architecture
and	O
therefore	O
has	O
separate	O
memory	B-General_Concept
management	I-General_Concept
units	I-General_Concept
(	O
MMUs	O
)	O
for	O
data	O
and	O
instruction	O
memories	O
.	O
</s>
<s>
These	O
MMUs	O
each	O
consist	O
of	O
a	O
hash-based	O
1-way	O
direct-mapped	O
translation	B-Architecture
lookaside	I-Architecture
buffer	I-Architecture
(	O
TLB	O
)	O
with	O
page	O
size	O
of	O
8KiB	O
and	O
a	O
default	O
size	O
of	O
64	O
entries	O
.	O
</s>
<s>
There	O
is	O
also	O
a	O
one-way	O
direct-mapped	O
cache	B-General_Concept
each	O
for	O
both	O
the	O
instruction	O
memory	O
and	O
for	O
the	O
data	O
memory	O
.	O
</s>
<s>
Each	O
cache	B-General_Concept
has	O
a	O
default	O
size	O
of	O
8KiB	O
,	O
but	O
both	O
are	O
individually	O
scalable	O
between	O
1	O
and	O
64KiB	O
.	O
</s>
<s>
The	O
core	O
achieves	O
1.34	O
CoreMarks	O
per	O
MHz	O
at	O
50MHz	O
on	O
Xilinx	O
FPGA	B-Architecture
technology	O
.	O
</s>
<s>
Under	O
the	O
worst	O
case	O
,	O
the	O
clock	O
frequency	O
for	O
the	O
OR1200	B-Device
is	O
250MHz	O
at	O
a	O
0.18μm	O
6LM	O
fabrication	O
process	O
.	O
</s>
<s>
Using	O
the	O
Dhrystone	O
benchmark	O
,	O
a	O
250MHz	O
OR1200	B-Device
processor	O
performs	O
250	O
Dhrystone	O
millions	O
of	O
instructions	O
per	O
second	O
(	O
DMIPS	O
)	O
in	O
the	O
worst	O
case	O
.	O
</s>
<s>
Generally	O
,	O
the	O
OR1200	B-Device
is	O
intended	O
to	O
be	O
used	O
in	O
a	O
variety	O
of	O
embedded	O
applications	O
,	O
including	O
telecommunications	O
,	O
portable	O
media	O
,	O
home	O
entertainment	O
,	O
and	O
automotive	O
applications	O
.	O
</s>
<s>
The	O
GNU	B-Application
toolchain	I-Application
(	O
including	O
GCC	B-Application
)	O
has	O
also	O
been	O
successfully	O
ported	O
to	O
the	O
architecture	O
,	O
although	O
it	O
is	O
not	O
bug-free	O
.	O
</s>
<s>
There	O
is	O
a	O
port	O
of	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
for	O
OR1K	B-Device
which	O
runs	O
on	O
the	O
OR1200	B-Device
.	O
</s>
<s>
Recent	O
ports	O
of	O
the	O
embedded	O
C	O
libraries	O
newlib	B-Language
and	O
uClibc	B-Language
are	O
also	O
available	O
for	O
the	O
platform	O
.	O
</s>
<s>
The	O
OR1200	B-Device
has	O
been	O
successfully	O
implemented	O
using	O
FPGA	B-Architecture
and	O
ASIC	O
technologies	O
.	O
</s>
<s>
The	O
first	O
public	O
record	O
of	O
the	O
OpenRISC	B-Device
1000	O
architecture	O
is	O
in	O
2000	O
.	O
</s>
