Merge branch 'main' of https://github.com/erickahmed/square-one
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@@ -9,29 +9,28 @@ Most of the gates also have a 16-bit version and eventually a n-way version (som
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Ex: a 4-way mux gate:
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'''
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module mux4way(out, i0, i1, i2, i3, sel0, sel1);
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input i0, i1, i2, i3;
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input [3:0]sel;
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output [3:0]out;
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wire tmp0, tmp1, tmp2, tmp3;
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```v
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module mux4way(out, i0, i1, i2, i3, sel0, sel1);
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input i0, i1, i2, i3;
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input [3:0]sel;
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output [3:0]out;
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wire tmp0, tmp1, tmp2, tmp3;
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wire [3:0] [1:0] sel0 = sel;
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wire [0:3] [1:0] sel1 = sel;
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wire [3:0] [1:0] sel0 = sel;
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wire [0:3] [1:0] sel1 = sel;
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not(notSel0, sel0);
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not(notSel1, sel1);
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not(notSel0, sel0);
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not(notSel1, sel1);
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and(tmp0, i0, notSel0);
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and(tmp1, i1, sel0);
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and(tmp2, i2, notSel1);
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and(tmp3, i3, sel1);
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and(tmp0, i0, notSel0);
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and(tmp1, i1, sel0);
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and(tmp2, i2, notSel1);
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and(tmp3, i3, sel1);
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or4way(out, tmp0, tmp1, tmp2, tmp3);
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endmodule
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'''
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or4way(out, tmp0, tmp1, tmp2, tmp3);
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endmodule
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```
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#### Predefined gates (path: /gates/predefined)
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The predefined gates are by default implemented on Verilog/Systemverilog. Thus they are not strictly needed for building more advanced gates or chipset, but I still decided to add them as reference and learning purposes.
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@@ -91,13 +90,14 @@ Testbenches are a way to test the implementation of a particular gate using a Ve
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## Usage
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#### Verilog/Systemverilog logic gates
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To run any Verilog (.v) or Systemverilog (.sv) file, use *iverilog* (available for Windows, Linux and MacOS) using the command:
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>> iverilog filename.v
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```bash
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>> iverilog filename.v
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```
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To visually see the functioning of a gate and it's testbench you need to use *gtkwave* and have a .vcd file of the gate (plus eventually the testbench, in the same file):
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>> gtkwave filename.vcd
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```bash
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>> gtkwave filename.vcd
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```
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## Resources
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- Online Verilog Compiler: https://www.tutorialspoint.com/compile_verilog_online.php
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- Online FPGA Simulator: https://simulator.nirajmmenon.com/
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- Online FPGA Simulator: https://simulator.nirajmmenon.com/
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