Rule 90 is a one-dimensional cellular automaton with interesting properties.
The rules are simple. There is a one-dimensional array of cells (on or off). At each time step, the next state of each cell is the XOR of the cell's two current neighbours. A more verbose way of expressing this rule is the following table, where a cell's next state is a function of itself and its two neighbours:
| Left | Center | Right | Center's next state |
|---|---|---|---|
| 1 | 1 | 1 | 0 |
| 1 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 |
| 1 | 0 | 0 | 1 |
| 0 | 1 | 1 | 1 |
| 0 | 1 | 0 | 0 |
| 0 | 0 | 1 | 1 |
| 0 | 0 | 0 | 0 |
(The name "Rule 90" comes from reading the "next state" column: 01011010 is decimal 90.)
In this circuit, create a 512-cell system (q[511:0]), and advance by one time step each clock cycle. The load input indicates the state of the system should be loaded with data[511:0]. Assume the boundaries (q[-1] and q[512]) are both zero (off).
module top_module(
input clk,
input load,
input [511:0] data,
output [511:0] q );
always@(posedge clk) begin
if(load)
q<=data;
else
q<={1'b0,q[511:1]}^{q[510:0],1'b0};
//verilog最好的地方就是支持整个数组批量运算
end
endmodule
verilog真舒服