FSM in fpga's

[Avinash Sharma]

is it true that one-hot encoding for FSM's is used in FPGA's? If so,
why? is it due to the large amount of registers available i.e: enough
registers to store all states? what kind of encoding is using in ASIC's?

thanks much
--
avi

 

[p]

"is it true that one-hot encoding for FSM's is used in FPGA's? If so,
why? is it due to the large amount of registers available i.e: enough
registers to store all states? "

Yep!


"Avinash Sharma" <asharma3@REMOVETHIS.uiuc.edu.NOSPAM> wrote in message
news:c1k4qp$sq7$1@news.ks.uiuc.edu...

is it true that one-hot encoding for FSM's is used in FPGA's? If so,
why? is it due to the large amount of registers available i.e: enough
registers to store all states? what kind of encoding is using in ASIC's?

thanks much
--
avi

 

[Florian-Wolfgang Stock]

Hallo,

"Avinash Sharma" <asharma3@REMOVETHIS.uiuc.edu.NOSPAM> writes:

is it true that one-hot encoding for FSM's is used in FPGA's? If so,
why? is it due to the large amount of registers available i.e: enough
registers to store all states? what kind of encoding is using in ASIC's?

have a look at this:

http://toolbox.xilinx.com/docsan/2_1i/data/common/sim/app1.htm

Florian
--
int m,u,e=0;float l,_,I;main(){for(;1840-e;putchar((++e>907&&942>e?61-m:u)
["\t#*fg-pa.vwCh`lwp-e+#h`lwP##mbjqloE"]^3))for(u=_=l=0;79-(m=e%80)&&
I*l+_*_<6&&26-++u;_=2*l*_+e/80*.09-1,l=I)I=l*l-_*_-2+m/27.;}

 

[Hal Murray]

is it true that one-hot encoding for FSM's is used in FPGA's? If so,
why? is it due to the large amount of registers available i.e: enough
registers to store all states? what kind of encoding is using in ASIC's?

It sure simplifies decoding states.

I think the real answer is that overall, it fits well with the available
hardware resources. At least for some/many problems.

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[William Wallace]

"Avinash Sharma" <asharma3@REMOVETHIS.uiuc.edu.NOSPAM> wrote in message news:<c1k4qp$sq7$1@news.ks.uiuc.edu>...

is it true that one-hot encoding for FSM's is used in FPGA's? If so,
why? is it due to the large amount of registers available i.e: enough
registers to store all states? what kind of encoding is using in ASIC's?

thanks much

With a good synthesizer, you can specify any encoding you want. One
hots can run at higher frequencies and usually result in less
combinatorial logic.

 

[Mike Treseler]

"Avinash Sharma" wrote:

is it true that one-hot encoding for FSM's is used in FPGA's? If so,
why? is it due to the large amount of registers available i.e: enough
registers to store all states? what kind of encoding is using in ASIC's?

Try it both ways and see for yourself.
Be sure to cover all the state cases.

see thread:
http://groups.google.com/groups?q=vhdl+one+hot+fsm+stuck+nic

-- Mike Treseler