| module top(output LED1, LED2, LED3, LED4, LED5); | |
| localparam N = 31; | |
| wire [N:0] x; | |
| assign x[0] = x[N]; | |
| genvar ii; | |
| generate | |
| for (ii = 0; ii < N; ii = ii + 1) begin | |
| (* ringosc *) | |
| SB_LUT4 #(.LUT_INIT(1)) lut_i(.I0(x[ii]), .I1(), .I2(), .I3(), .O(x[ii+1])); | |
| end | |
| endgenerate | |
| assign clk = x[N]; | |
| reg [19:0] ctr; | |
| always @(posedge clk) | |
| ctr <= ctr + 1'b1; | |
| assign {LED5, LED4, LED3, LED2, LED1} = ctr[19:15]; | |
| endmodule |