Provided by: alliance_5.0-20110203-4_amd64
SYF - Finite State Machine synthesizer.
syf -a|j|m|u|o|r [-CDEOPRSTV] input_name [output_name]
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 synthesized, 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.
MBK_WORK_LIB(1) indicates the path to the read/write directory for the session.
-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.
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