SYF(1)                                                       CAO-VLSI Reference Manual                                                      SYF(1)

NAME

       SYF - Finite State Machine synthesizer.

ORIGIN

       This  software  belongs  to  the  ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in
       Paris, France.

       Web : http://asim.lip6.fr/recherche/alliance/
       E-mail : alliance-users@asim.lip6.fr

SYNOPSIS

       syf -a|j|m|u|o|r [-CDEOPRSTV] input_name [output_name]

DESCRIPTION

       syf is a Finite State Machine synthesizer.  syf allows a fast generation of VHDL Data Flow description (see  vbe(5))  from  a  VHDL  Finite
       State  Machine description (see fsm(5)).  The input FSM specification can use an internal STACK.  Both MOORE and MEALEY FSMs can be synthe-
       sized, with output registers if desired.  For a MOORE FSM, a timing-optimized implementation that emulates a  ROM  with  microsequencer  is
       possible.  A scan-path for the state registers can also be implemented.

ENVIRONMENT VARIABLES

       MBK_WORK_LIB(1)
                 indicates the path to the read/write directory for the session.

OPTIONS

       -a        Uses "Asp" as encoding algorithm.

       -j        Uses "Jedi" as encoding algorithm.

       -m        Uses "Mustang" as encoding algorithm.

       -u        Uses  an  encoding  given  by user through <input_name>.enc file.  In this file, a line started by a # character is a comment.  A
                 valid line contains one state name followed by its hexadecimal code.

       -o        Uses the one hot encoding algorithm.

       -r        Uses distinct random numbers for state encoding.

       -C        Checks the transition's consistency.

       -D        With this option syf doesn't optimize unused, i.e Don't Care, codes.

       -E        Saves the encoding result in the <output_name>.enc.  This file has the same syntax as <input_name>.enc file which is used  by  -u
                 option.

       -O        With this option syf places registers on the outputs.

       -P        Implements  a  scan-path for the state registers, stack registers and possibly output registers. Scan-path mechanism is directely
                 included in states decoder. Users should use scapin(5) for a correct insertion of a scan-path in a netlist.  Please check  fsm(5)
                 for information about scan-path descriptions.

       -R        This option is only available for MOORE FSM. With this option, syf emulate s a ROM with micro-sequencer implementation : there is
                 no combinatorial logic between the state registers and the FSM outputs.  This can be mandatory for external  timing  constraints.
                 See fsm(5) and grog(1) for more on ROM descriptions.

       -S        With this option syf doesn't take into account the cost of the transitions to compute an encoding.

       -V        Verbose mode on.  Each step of the FSM synthesis is displayed on the standard output, along with some statistics.

EXAMPLE

       Environment variables:
       setenv MBK_WORK_LIB /alliance/tutorials/dlxm

       syf is called as follow (the dlx_ctrl.fsm is already created in /alliance/tutorials/dlxm) :

       syf -sE dlx_ctrl

       Two files will be generated, a states encoding file dlx_ctrls.enc and a VHDL data flow file /alliance/tutorials/dlxm/dlx_ctrls.vbe

SEE ALSO

       fsm(5), vbe(5), vhdl(5), boom(1), boog(1), loon(1), scapin(1), asimut(1), proof(1), MBK_WORK_LIB(1).

BUG REPORT

       This tool is under development at the ASIM department of the LIP6 laboratory.
       We need your feedback to improve documentation and tools.

ASIM
/LIP6                                                         October 1, 1997                                                           SYF(1)