Verilog实现开根号代码
时间: 2023-06-12 10:07:21 浏览: 130
Verilog语言本身不支持浮点数运算,因此在Verilog中实现开根号需要使用一些近似算法。以下是一种简单的二分查找算法实现开根号的Verilog代码:
```
module sqrt #(
parameter WIDTH = 8
) (
input logic signed [WIDTH-1:0] x,
output logic signed [WIDTH-1:0] y
);
logic signed [WIDTH-1:0] z;
logic signed [WIDTH-1:0] mid;
logic [WIDTH:0] x_abs;
logic [WIDTH:0] z_abs;
assign x_abs = (x < 0) ? -x : x;
always @(*) begin
z = {WIDTH{1'b0}};
z_abs = {WIDTH+1{1'b0}};
for (int i = WIDTH-1; i >= 0; i--) begin
z[i] = z_abs[i+1];
if (z_abs[i+1] * 2 + 1 <= x_abs[i+1]) begin
z[i] = 1'b1;
end
z_abs[i+1:0] = (z_abs[i+1] * 2 + z[i]) << 1;
end
end
always @(*) begin
mid = {WIDTH{1'b0}};
for (int i = WIDTH-1; i >= 0; i--) begin
mid[i] = y[i];
if (mid[i] == 1'b0) begin
mid[i] = 1'b1;
end else begin
mid[i] = 1'b0;
break;
end
end
if (mid * mid <= x_abs) begin
y = mid;
end
for (int i = WIDTH-1; i >= 0; i--) begin
if ((y * 2 + z[i]) * (y * 2 + z[i]) <= x_abs) begin
y = y * 2 + z[i];
end
end
end
assign y = (x < 0) ? -y : y;
endmodule
```
该代码使用了二分查找算法,以逐步逼近输入数的平方根。其中,`x`是输入,`y`是输出,`WIDTH`是输入和输出的位宽。
该代码的实现仅供参考,可能不适用于所有应用场景,建议在使用前进行充分测试和验证。