yosys

问题 I want to parse the following sequential gate level net list. And I expect that the output will give me the gate ordering ( port order) so I can do other computation on the code. I tried to do that using yosys command read_verilog s27.v . I was able to debug the code, yet I could not get the cell library or any thing that will get me the gate ordering. P.S: I tried that using abc compiler and I only got the primary inputs and outputs order not the gate, and I asked before if yosys can do that

问题 Using the following script, I am synthesising to a standard cell library for which I have a lib file, my_library.lib : read_liberty -lib my_library.lib script yosys_readfiles.ys proc; opt; memory; opt; fsm -norecode; opt techmap; opt dfflibmap -liberty my_library.lib abc -liberty my_library.lib hilomap -hicell LIB_TIEHI Y -locell LIB_TIELO Y clean write_verilog -noattr -noexpr output.v stat While this generally works, I found that some of the logic isn't mapped efficiently. For example, I

问题 I have a sample combinatorial circult in Verilog where I can follow the instruction to do logic synthesis and generate blif file. However, what I need is to generate the CNF formula out of the circuit. Tools such as ABC only allows to generate from combinatorial miter (i.e., with 1 output). I tried the yosys instruction "sat -dump_cnf FILE", and indeed I am able to generate a CNF file. However, I am not sure how to map variables in the CNF with I/Os in the circuit. Have anyone studied the

问题 I have the following clock gate in the design: module my_clkgate(clko, clki, ena); // Clock gating latch triggered on the rising clki edge input clki; input ena; output clko; parameter tdelay = 0; reg enabled; always @ (clki, ena) begin if (!clki) begin enabled = ena; end end assign #(tdelay) clko = enabled & clki; endmodule When synthesising with Yosys, the resulting netlist instantiates (for the reg enabled ) a \$_DLATCH_P_ cell which is not included in the standard cell lib file I am using

问题 I'd like to make my Yosys scripts more DRY by factoring out common parameters, such as in the following example: read_liberty -lib /long/path/to/lib/file ... dfflibmap -liberty /long/path/to/lib/file ... abc -liberty /long/path/to/lib/file I haven't found a way to declare or de-reference variables, is there any way like in TCL ( set lib_file /long/path/to/lib/file ) or Bash ( export lib_file=/long/path/to/lib/file )? 回答1: You can use TCL. See yosys -h tcl for details. Run TCL scripts with

问题 We know that we can get AST textfile of Verilog code. Now I want to modify the AST to get some new features, Is ANTLR right for this job,or which software should I use? Or How should I do? Then, I want to synthesis the modified AST to generate Verilog code? Can YOSYS finish this Job? What should I do? Can you tell me in detail？ Thanks for your help! 回答1: ANTLR parses, but is not particularly good at supporting modifications to the AST or regenerating the source code accurately. Our DMS

问题 We know that YOSYS (YOSYS for win32) can get an AST result using read_verilog _dump_ast command, but the result view in the command window. How can we get the result as a textfile from the command window? Thank you very much! 回答1: You can redirect the yosys log output using the -l command line option (e.g. yosys -l logfile.txt ), or using the tee command in yosys: tee -o outputfile.txt read_verilog -dump_ast1 input .v 来源： https://stackoverflow.com/questions/37289536/how-to-get-the-ast-result

问题 An instance of SigMap is guaranteed to produce the same output for every connected wire in a design. But does this hold true for different instances of SigMap running in different versions of yosys across different platforms? What about if the initial queries are done in the same order? Is there some way to cause SigMap to return the same SigBit across multiple runs on multiple versions? 回答1: SigMap is not guaranteed to produce a canonical output with the SigMap(module) constructor, the exact

问题 For a larger project, I need to create a list of unconnected cell ports using the Yosys RTLIL API. What is the best strategy for doing so? 回答1: The plain RTLIL API does not provide any indexes. You can determine the net connected to a port, but not the ports connected to a net. There are powerful indexers available in Yosys that can help you here, for example ModIndex from kernel/modtools.h , but in most cases it is simplest to create a custom index for whatever you need. In this case we just

问题 i am trying out this pretty neat tool called Yosys to synthesize my Verilog designs. i want to export out the FSM in my Verilog design using the Yosys command fsm_export but it does not generate anything. I wonder how is this command supposed to be called? the series of commands i called were: read_verilog qwerty.v ; fsm_export if the generation is successful and i have the FSM in KISS2 format, anyone knows what (open source) tools are there to allow me to visualize the FSM? thanks a bunch!