<s>
ModelSim	B-Algorithm
is	O
a	O
multi-language	O
environment	O
by	O
Siemens	O
(	O
previously	O
developed	O
by	O
Mentor	O
Graphics	O
,	O
)	O
for	O
simulation	O
of	O
hardware	O
description	O
languages	O
such	O
as	O
VHDL	B-Language
,	O
Verilog	B-Language
and	O
SystemC	B-Language
,	O
and	O
includes	O
a	O
built-in	O
C	O
debugger	O
.	O
</s>
<s>
ModelSim	B-Algorithm
can	O
be	O
used	O
independently	O
,	O
or	O
in	O
conjunction	O
with	O
Intel	B-Language
Quartus	I-Language
Prime	I-Language
,	O
PSIM	B-Algorithm
,	O
Xilinx	B-Algorithm
ISE	I-Algorithm
or	O
Xilinx	B-Algorithm
Vivado	I-Algorithm
.	O
</s>
<s>
Simulation	O
is	O
performed	O
using	O
the	O
graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
,	O
or	O
automatically	O
using	O
scripts	O
.	O
</s>
<s>
Mentor	O
HDL	O
simulation	O
products	O
are	O
offered	O
in	O
multiple	O
editions	O
,	O
such	O
as	O
ModelSim	B-Algorithm
PE	O
and	O
Questa	O
Sim	O
.	O
</s>
<s>
Questa	O
Sim	O
offers	O
high-performance	O
and	O
advanced	O
debugging	O
capabilities	O
,	O
while	O
ModelSim	B-Algorithm
PE	O
is	O
the	O
entry-level	O
simulator	O
for	O
hobbyists	O
and	O
students	O
.	O
</s>
<s>
Questa	O
Sim	O
is	O
used	O
in	O
large	O
multi-million	O
gate	O
designs	O
,	O
and	O
is	O
supported	O
on	O
Microsoft	B-Application
Windows	I-Application
and	O
Linux	O
,	O
in	O
32-bit	O
and	O
64-bit	O
architectures	O
.	O
</s>
<s>
ModelSim	B-Algorithm
can	O
also	O
be	O
used	O
with	O
MATLAB/Simulink	O
,	O
using	O
Link	O
for	O
ModelSim	B-Algorithm
.	O
</s>
<s>
Link	O
for	O
ModelSim	B-Algorithm
is	O
a	O
fast	O
bidirectional	O
co-simulation	O
interface	O
between	O
Simulink	B-Application
and	O
ModelSim	B-Algorithm
.	O
</s>
<s>
For	O
such	O
designs	O
,	O
MATLAB	B-Language
provides	O
a	O
numerical	O
simulation	O
toolset	O
,	O
while	O
ModelSim	B-Algorithm
provides	O
tools	O
to	O
verify	O
the	O
hardware	O
implementation	O
&	O
timing	O
characteristics	O
of	O
the	O
design	O
.	O
</s>
<s>
ModelSim	B-Algorithm
uses	O
a	O
unified	O
kernel	O
for	O
simulation	O
of	O
all	O
supported	O
languages	O
,	O
and	O
the	O
method	O
of	O
debugging	O
embedded	O
C	O
code	O
is	O
the	O
same	O
as	O
VHDL	B-Language
or	O
Verilog	B-Language
.	O
</s>
<s>
ModelSim	B-Algorithm
and	O
Questa	O
Sim	O
products	O
enable	O
simulation	O
,	O
verification	O
and	O
debugging	O
for	O
the	O
following	O
languages	O
:	O
</s>
