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Diffstat (limited to 'README')
| -rw-r--r-- | README | 26 |
1 files changed, 14 insertions, 12 deletions
@@ -23,15 +23,14 @@ yosys -- Yosys Open SYnthesis Suite =================================== -This is a framework for RTL synthesis tools. It is highly -experimental and under construction. The goal for now is -to implement an extensible Verilog-2005 synthesis tool. +This is a framework for RTL synthesis tools. It currently has +extensive Verilog-2005 support and provides a basic set of +synthesis algorithms for various application domains. -The aim of this tool is to generate valid logic netlists -from HDL designs in a manner that allows for easy addition -of extra synthesis passes. This tool does not aim at generating -efficient logic netlists. This can be done by passing the -output of Yosys to a low-level synthesis tool such as ABC. +Yosys can be adapted to perform any synthesis job by combining +the existing passes (algorithms) using synthesis scripts and +adding additional passes as needed by extending the yosys c++ +codebase. Yosys is free software licensed under the ISC license (a GPL compatible licence that is similar in terms to the MIT license @@ -59,6 +58,11 @@ a simple synthesis job using the interactive command shell: $ ./yosys yosys> +the command "help" can be used to pritn a list of all available +commands and "help <command>" to print details on the specified command: + + yosys> help help + reading the design using the verilog frontend: yosys> read_verilog tests/simple/fiedler-cooley.v @@ -127,7 +131,7 @@ synthesis script will synthesize for the given cell library: hierarchy; proc; memory; opt; fsm; opt # mapping to internal cell library - techmap + techmap; opt # mapping flip-flops to mycells.lib dfflibmap -liberty mycells.lib @@ -213,13 +217,11 @@ TODOs / Open Bugs - Additional internal cell types: $pla and $lut -- Subsystem for selecting stuff (and limiting scope of passes) - - Support for registering designs (as collection of modules) to CellTypes - Kernel support for collections of cells (from input/output cones, etc) - Smarter resource sharing pass (add MUXes and get rid of duplicated cells) -- Better FSM state encoding and technology mapping +- Better FSM state encoding |