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| Guest29 | Hi | 12:27 |
|---|---|---|
| Guest29 | I am running Yosys for Synthesis | 12:27 |
| Guest29 | I am using *.ys files | 12:27 |
| Guest29 | So in *.ys file, how can we define variable ? | 12:27 |
| Guest29 | Like read_verilog $XYZ/rtl_path/abc.v | 12:28 |
| jix | you can't, you need to use TCL if you need that | 12:28 |
| jix | (or alternatively generate .ys files from some other form of script) | 12:29 |
| Guest29 | Can you help me how by TCL ? I have tried with yosys -c <*.tcl> and I have declared read_verilog $XYZ/rtl_path/abc.v in TCL but not working | 12:29 |
| jix | in TCL you need to either prefix commands with the yosys command so it would be `yosys read_verilog $XYZ/rtl_path/abc.v` in the TCL script (not including the `) | 12:30 |
| jix | alternatively you can run the TCL command `yosys -import` at the start to make all non-conflicting yosys commands available as TCL commands directly | 12:31 |
| Guest29 | Ok. Thanks. At the start mean ? > I use this command - yosys -l yosys_run.log -s yosys_script.ys | 12:32 |
| jix | no you use `yosys -l yosys_run.log -c yosys_script.tcl` but then at the top of `yosys_script.tcl` you run `yosys -import` as the first TCL command | 12:33 |
| jix | (or alternatively in `yosys_script.tcl` you prefix every yosys command with `yosys` e.g. `yosys read_verilog ....`) | 12:33 |
| Guest29 | Ok | 12:34 |
| jix | and if you want to access environment variables, not TCL variables, you need to use $::env(VAR_NAME) | 12:34 |
| jix | but that's just standard TCL | 12:34 |
| Guest29 | Suppose I have multiple commands like read_libert, read_verilog , synth, difflibmap etc .... | 12:39 |
| Guest29 | abc -liberty, opt_clean, write_verilog .... | 12:40 |
| jix | what's your question in that case? | 12:41 |
| Guest29 | Suppose above commands are in *.ys, Now I have converted to TCL so for each command I have to write yosys ? | 12:41 |
| jix | You have two choices, 1) you run `yosys -import` once at the top of the .tcl file or 2) you write `yosys` before every command | 12:42 |
| jix | but some yosys commands have names that are already existing commands in TCL, so if you use `yosys -import` you have to watch out for those since they will have a different name | 12:43 |
| jix | those are the yosys commands `proc` and `rename` according to the documentation https://yosyshq.readthedocs.io/projects/yosys/en/latest/cmd/tcl.html | 12:43 |
| tpb | Title: tcl - execute a TCL script file - YosysHQ Yosys 0.55-dev documentationMenuExpandLight mode (at yosyshq.readthedocs.io) | 12:44 |
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