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Erick
2022-03-05 00:03:13 +01:00
parent ba2cc09b0c
commit bd8b10214c
1 changed files with 29 additions and 35 deletions
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@@ -8,30 +8,28 @@ Logic gates are the lowest level point from which this project is implemented. T
Most of the gates also have a 16-bit version and eventually a n-way version (some even n-way-16-bit).
Ex: a 4-way mux gate:
'''
module mux4way(out, i0, i1, i2, i3, sel0, sel1);
input i0, i1, i2, i3;
input [3:0]sel;
output [3:0]out;
wire tmp0, tmp1, tmp2, tmp3;
module mux4way(out, i0, i1, i2, i3, sel0, sel1);
input i0, i1, i2, i3;
input [3:0]sel;
output [3:0]out;
wire tmp0, tmp1, tmp2, tmp3;
wire [3:0] [1:0] sel0 = sel;
wire [0:3] [1:0] sel1 = sel;
wire [3:0] [1:0] sel0 = sel;
wire [0:3] [1:0] sel1 = sel;
not(notSel0, sel0);
not(notSel1, sel1);
not(notSel0, sel0);
not(notSel1, sel1);
and(tmp0, i0, notSel0);
and(tmp1, i1, sel0);
and(tmp2, i2, notSel1);
and(tmp3, i3, sel1);
and(tmp0, i0, notSel0);
and(tmp1, i1, sel0);
and(tmp2, i2, notSel1);
and(tmp3, i3, sel1);
or4way(out, tmp0, tmp1, tmp2, tmp3);
or4way(out, tmp0, tmp1, tmp2, tmp3);
endmodule
endmodule
'''
#### Predefined gates (path: /gates/predefined)
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.
@@ -40,26 +38,22 @@ Testbenches are a way to test the implementation of a particular gate using a Ve
Ex: testbench for a xor gate:
'''
module xor_tb();
reg ta, tb;
wire ty;
module xor_tb();
reg ta, tb;
wire ty;
xor_gate dut(y, ta, tb);
xor_gate dut(y, ta, tb);
initial begin
ta=0, tb=0;
$monitor("IN: %b, %b ",ta, tb, "OUT: ",y);
ta=0, tb=1;
$monitor("IN: %b, %b ",ta, tb, "OUT: ",y);
ta=1, tb=0;
$monitor("IN: %b, %b ",ta, tb, "OUT: ",y);
ta=1, tb=1;
end
endmodule
'''
initial begin
ta=0, tb=0;
$monitor("IN: %b, %b ",ta, tb, "OUT: ",y);
ta=0, tb=1;
$monitor("IN: %b, %b ",ta, tb, "OUT: ",y);
ta=1, tb=0;
$monitor("IN: %b, %b ",ta, tb, "OUT: ",y);
ta=1, tb=1;
end
endmodule
### Arithmetic Logic Unit (path: /alu)
The ALU is written is Systemverilog (such as the CPU and other complex components). It handles 16-bit values and performs numerous operations, as: