<s>
Synchronous	B-Architecture
Data	I-Architecture
Flow	I-Architecture
(	O
SDF	O
)	O
is	O
a	O
restriction	O
on	O
Kahn	B-Application
process	I-Application
networks	I-Application
where	O
the	O
number	O
of	O
tokens	O
read	O
and	O
written	O
by	O
each	O
process	O
is	O
known	O
ahead	O
of	O
time	O
.	O
</s>
<s>
In	O
some	O
cases	O
,	O
processes	O
can	O
be	O
scheduled	O
such	O
that	O
channels	O
have	O
bounded	O
FIFOs	B-Operating_System
.	O
</s>
<s>
SDF	O
is	O
useful	O
for	O
modeling	O
digital	B-General_Concept
signal	I-General_Concept
processing	I-General_Concept
(	O
DSP	O
)	O
routines	O
.	O
</s>
<s>
Models	O
can	O
be	O
compiled	O
to	O
target	O
parallel	O
hardware	O
like	O
FPGAs	B-Architecture
,	O
processors	O
with	O
DSP	O
instruction	O
sets	O
like	O
Qualcomm	O
's	O
Hexagon	O
,	O
and	O
other	O
systems	O
.	O
</s>
