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0 votes
in Verilog by (240 points)

What is an AND gate and how do you use it in Verilog?

2 Answers

0 votes
by (260 points)

An and gate is a basic logic circuit with the following "truth table" ( input-output relationship ) :

// when a = 0 and b = 0 - result = 0
// when a = 0 and b = 1 - result = 0
// when a = 1 and b = 0 - result = 0
// when a = 1 and b = 1 - result = 1

Example :

wire a , b , result;

assign result = a & b;
0 votes
by (200 points)

This is a built in primitive that is implements the logic AND function. It has one scalar output and multiple scalar inputs. The first terminal (port) in the list of gate terminals is an output and the others are inputs. This is one of Verilog gates primitives. These primitives are for Gate Level Simulation and mostly are used for modeling the ASIC/FPGA cells in post-synthesis netlists.

and and1(out1,in1,in2,in3);
and and2(out2,in1,in2);
and and3(out3,in1);

// type:
`timescale 1ns/10ps
`celldefine
module AA1HS (Z, A1, A2, B1, B2);
output Z;
input A1, A2, B1, B2;

// Function
and (Z, A1, A2, B1, B2);

// Timing
specify
(A1 => Z) = 0;
(A2 => Z) = 0;
(B1 => Z) = 0;
(B2 => Z) = 0;
endspecify
endmodule
`endcelldefine

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