Synthesis of more FSMs in one file using DC

[Marek Ponca]

Hi everybody,

is there some methodology supporting for synthesis of
more FSMs included in one source file ?

How to set constraints of each one FSM separately ?

Something like:

dc_shell:> set_fsm machine1
dc_shell:> set_encoding_style one_hot

dc_shell:> set_fsm machine2
dc_shell:> set_encoding_style gray

dc_shell:> compile

dc_shell:> set_fsm machine1
dc_shell:> report_fsm

dc_shell:> set_fsm machine2
dc_shell:> report_fsm


Or is it really needed to write FSMs into separate files ?

I was unable to find any synopsys/synthesis newsgroup (

Thanks
Marek

--
Dipl.-Ing. Marek Ponca
Institut of Circuit Technology and Electronics
Faculty of Electrical Engineering and Information Technology

Ilmenau Technical University
P.O. BOX 10 05 65
98684 Ilmenau
Germany

 

[Mohammed khader]

HI,

Only one FSM design per entity is recommended. If a file has
multiple FSMs for a single entity , only one is extracted each time you
compile. It is not possible to predict which FSM will be extracted.
Regards,

Mohammed A khader.

 

[Falk Brunner]

Hi everybody,

is there some methodology supporting for synthesis of
more FSMs included in one source file ?

How to set constraints of each one FSM separately ?

Something like:

dc_shell:> set_fsm machine1
dc_shell:> set_encoding_style one_hot

dc_shell:> set_fsm machine2
dc_shell:> set_encoding_style gray

dc_shell:> compile

dc_shell:> set_fsm machine1
dc_shell:> report_fsm

dc_shell:> set_fsm machine2
dc_shell:> report_fsm


Or is it really needed to write FSMs into separate files ?

Synthesis constraints for XST

VHDL
Before using FSM_ENCODING, declare it with the following syntax:
attribute fsm_encoding: string;
After FSM_ENCODING has been declared, specify the VHDL
constraint as follows:
attribute fsm_encoding of {entity_name|signal_name}:
{entity|signal} is "{auto|one-hot|
compact|gray|sequential|johnson|user}";
The default is AUTO.

Regards
Falk