Consider two 4-bit binary numbers A and B. Bits of A are a3, a2, a1, and a0, and bits of B are b3, b2, b1, and b0. A is greater than B if a3 is 1 and b3 is 0, but if a3 and b3 are the same, then if a2 is 1 and b2 is 0, we can determine that A is greater than B. This evaluation continues until a0 and b0 are considered. If a0 and b0 are equal then A and B are equal. Using discrete gates and Verilog gate primitives build a 4-bit comparator that generates a 1 on its GT output when its 4-bit input A is greater than its B input, and a 1 on its EQ output when A and B are equal. Use the generate statement and other Verilog iterative logic support structures.
时间: 2023-12-24 16:01:57 浏览: 21
Here is the Verilog code for a 4-bit comparator that generates a 1 on its GT output when A is greater than B, and a 1 on its EQ output when A and B are equal:
```
module comparator (
input [3:0] A,
input [3:0] B,
output GT,
output EQ
);
wire [3:0] greater; // intermediate signals for comparison
// Compare A and B bit by bit
assign greater[3] = (A[3] == 1) && (B[3] == 0);
assign greater[2] = (A[3] == B[3]) && (A[2] == 1) && (B[2] == 0);
assign greater[1] = (A[3] == B[3]) && (A[2] == B[2]) && (A[1] == 1) && (B[1] == 0);
assign greater[0] = (A[3] == B[3]) && (A[2] == B[2]) && (A[1] == B[1]) && (A[0] == 1) && (B[0] == 0);
// Generate GT output
assign GT = greater[3] || greater[2] || greater[1] || greater[0];
// Generate EQ output
assign EQ = (A == B);
endmodule
```
In this code, we first declare the input and output ports of the module. We then define an intermediate signal `greater` which stores the comparison results between A and B bit by bit. We use the `assign` statement to calculate the value of `greater` for each bit. Finally, we use the `assign` statement again to generate the GT and EQ outputs based on the values of `greater` and the equality of A and B.