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Sunday, September 1, 2019

Reference-Page-For: Yosys is a framework for Verilog RTL synthesis









Source:


Yosys is a framework for Verilog RTL synthesis. It currently has extensive Verilog-2005 support and provides a basic set of synthesis algorithms for various application domains. Selected features and typical applications:
  • Process almost any synthesizable Verilog-2005 design
  • Converting Verilog to BLIF / EDIF/ BTOR / SMT-LIB / simple RTL Verilog / etc.
  • Built-in formal methods for checking properties and equivalence
  • Mapping to ASIC standard cell libraries (in Liberty File Format)
  • Mapping to Xilinx 7-Series and Lattice iCE40 FPGAs
  • Foundation and/or front-end for custom flows
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++ code base.
Yosys is free software licensed under the ISC license (a GPL compatible license that is similar in terms to the MIT license or the 2-clause BSD license).

Example Usage

Yosys is controlled using synthesis scripts. For example, the following Yosys synthesis script reads a design (with the top module mytop) from the verilog file mydesign.v, synthesizes it to a gate-level netlist using the cell library in the Liberty file mycells.lib and writes the synthesized results as Verilog netlist to synth.v:
# read design 
read_verilog mydesign.v

# elaborate design hierarchy
hierarchy -check -top mytop

# the high-level stuff
proc; opt; fsm; opt; memory; opt

# mapping to internal cell library
techmap; opt

# mapping flip-flops to mycells.lib
dfflibmap -liberty mycells.lib

# mapping logic to mycells.lib
abc -liberty mycells.lib

# cleanup
clean

# write synthesized design
write_verilog synth.v
The synth command provides a good default script that can be used as basis for simple synthesis scripts:
# read design 
read_verilog mydesign.v

# generic synthesis
synth -top mytop

# mapping to mycells.lib
dfflibmap -liberty mycells.lib
abc -liberty mycells.lib
clean

# write synthesized design
write_verilog synth.v
See help synth for details on the synth command.



Links

/yosys 

All other links below-this-line are to other projects.


Online Services

  • EDA Playground -- Web Interface to many EDA tools, including Yosys
  • Blinklight -- A visual FPGA dev tool for simple designs

Free Verilog Simulators

Free Software for High-Level Circuit Synthesis and/or Analysis

  • Chisel -- Constructing Hardware in a Scala Embedded Language
  • PandA -- high-level synthesis of C based descriptions
  • CLaSH -- A compiler from Haskell to Verilog/VHDL
  • MyHDL -- an open source Python package that lets you go from Python to silicon
  • Migen -- a Python-based tool that aims at automating further the VLSI design process
  • Cx -- A modern C-like language to create digital hardware

Free Software for Low-Level Circuit Synthesis and/or Analysis

  • ABC -- extensive tools for synthesis and verification of binary sequential logic
  • AIGER -- a format, library and set of utilities for And-Inverter Graphs
  • MiniSAT -- the SAT solver library used in Yosys
  • Torc -- infrastructure and tool set for mapping, placing, and routing
  • RapidSmith -- a research-based, open source FPGA CAD tool for modern Xilinx FPGAs
  • Open Circuit Design -- collection of open-source EDA tools, including Qflow
  • Coriolis2 -- an ASIC place and route flow
  • Workcraft -- a framework for interpreted graph models
  • netlistsvg -- SVG schematic from a Yosys JSON netlist

Verilog Tutorials



Documentation

This page has links to all the documentation resources available for Yosys.

Yosys Manual

A quick first-steps tutorial can be found in the README file.
The Yosys manual can be downloaded here (PDF).

Support

The best places to ask questions are the Yosys Subreddit, Stack Overflow and #yosys on freenode. The best place to report a bug is on GitHub.

Presentation Slides

This presentation slides cover a wide range of topics related to Yosys. (The LaTeX source is part of the Yosys source distribution. Fell free to adapt the slides as needed.)

Application Notes


Papers and other Publications

This section is under construction.

In papers and reports, please refer to Yosys as follows: Clifford Wolf. Yosys Open SYnthesis Suite. http://www.clifford.at/yosys/, e.g. using the following BibTeX code:
@MISC{Yosys,
 author = {Clifford Wolf},
 title = {Yosys Open SYnthesis Suite},
 howpublished = "\url{http://www.clifford.at/yosys/}"
}

Command Reference





Source:
Yosys HQ / Yosys Open SYnthesis Suite



Saturday, August 31, 2019

Reference-Post: Xilinx ISE-Source-File-Types

PWD:ISE-Source-File-Types
Xilinx Source-File-Types ISE






Source File Types

To use and manage source files in Project Navigator, you must add the source files to the project. You can either create new source files in Project Navigator and automatically add them to the project, or you can add existing source files to the project. Following is a list of the supported source types. Some source types may not be available, depending on your design properties (top-level module type, target device, and synthesis tool). 

Note For a list of all the file types generated by the ISE® software, see the "Xilinx® Development System Files" appendix in the Command Line Tools User Guide.

File Type
Extension
Icon
Description
New Source Wizard Behavior/Tool Launched
Block RAM Memory Map (BMM File)
.bmm
Image

Used in PowerPC® and MicroBlaze™ processor designs to describe the organization of Block RAM memory.
Note Only one BMM Module is allowed per project.
Opens the file in the text editor you specify in the Editors page of the Preferences dialog box. The CPU executable code is automatically inserted in the configuration file during design implementation.
ChipScope Definition and Connection (CDC File)
.cdc  
Image
Contains generic information about the trigger and data ports of the ChipScope™ core.

Adds the file to the project. Double-click the CDC file in the Hierarchy pane of the Design panel to run the implementation process and launch the ChipScope Pro Core Inserter. For details, see the ChipScope Pro Tool Debugging Overview.
Note  The ChipScope Pro tool must be installed for this source type to be available.
Electronic Data Interchange Format (EDIF)
.edn, .edf, .edif, .sedif
Image
Specifies the design netlist in an industry standard file format.

N/A
Must be generated by a third-party design entry tool and added to the project.
Note  You can only add an EDIF file as a top-level module, not as a lower-level module. If you are using hierarchical EDIF files, lower-level EDIF files are automatically processed during the implementation process.
ELF
.elf
Image

Contains an executable CPU code image.
Note  Only one ELF file is allowed per project.

N/A
Must be generated by the Data2MEM command line tool and added to the project.
Embedded Processor
.xmp
Image
Embedded microprocessor project file created with Xilinx Platform Studio.
Launches the Xilinx Platform Studio in which you can define the embedded processor system portion of your design. For details, see the Embedded Development Kit Documentation.
Implementation Constraints File
also known as User Constraints File (UCF)
.ucf
Image
Contains user-specified logical constraints.

Adds the file to the project. Double-click the UCF file in the Hierarchy pane of the Design panel, or double-click a Constraints Entry process in the Processes pane to open the file.
You can assign multiple UCFs to the top-level module. For details, see Constraints Entry Methods.
IP (Architecture Wizard)
.xaw
Image
Contains predefined logic functions that configure architecture features or modules.
Launches one of the Xilinx Architecture Wizards in which you can define your IP. For details, see Working with Architecture Wizard IP.
IP (CORE Generator)
.xco
Image
Contains predefined logic functions.
Launches one of the Xilinx IP core customization tools in which you can define your IP. For details, see Working with CORE Generator™ IP.
Memory Definition (MEM File)
.mem
Image

Used to define the contents of memory (RAMB4 and RAMB16).
Note Only one MEM file is allowed per project.
Opens the file in the text editor you specify in the Editors page of the Preferences dialog box. The CPU executable code is automatically inserted in the configuration file during design implementation.
Schematic
.sch
Image
Contains a schematic design.
Opens the schematic file in the Project Navigator Workspace. For details, see the Schematic Overview.
System Generator module
.sgp
Image
Contains Digital Signal Processing (DSP) system module created with System Generator for DSP.

N/A
Must be added to the project.
Targeted device, package, and speed grade
N/A
Image
Shows the targeted device, package, and speed grade.
N/A
Undefined
N/A
Image
Contains an instantiated module that has not been added to the ISE project but is referenced by a source file in the ISE project.
N/A
User Document
Multiple file types
Image
Contains user information that is not implemented with the project, for example, supporting documentation.

N/A
Must be added to the project.
Verilog Module
.v
Image
Contains Verilog design code.
Opens the file in the text editor you specify in the Editors page of the Preferences dialog box.
Verilog Test Fixture
.v
Image
Defines the stimulus to the ports of an HDL file.
Prompts you to associate the file with a Verilog source module and then opens a skeleton test bench file in the text editor you specify in the Editors page of the Preferences dialog box.
VHDL Library
N/A
Image
Contains a collection of VHDL packages.
Adds a new directory to the vhdl library directory in the Libraries panel.
VHDL Module
.vhd
Image
Contains VHDL design code.
Opens the file in the text editor you specify in the Editors page of the Preferences dialog box.
VHDL Package
.vhd
Image
Contains definitions, macros, sub-routines, supplemental types, subtypes, constants, functions, and other files.
Opens the file in the text editor you specify in the Editors page of the Preferences dialog box.
VHDL Test Bench
.vhd  
Image
Defines the stimulus to the ports of an HDL file.
Prompts you to associate the file with a VHDL source and then opens a skeleton test bench file in the text editor you specify in the Editors page of the Preferences dialog box.