source: sandbox/MultiChannelUSB/pwm.v@ 171

module pwm
        (
                input   wire                    clock,
                input   wire    [47:0]  cfg_data,
                output  wire    [3:0]   out_data

        );

        reg             [12:0]  int_data_reg [3:0];
        wire    [11:0]  cfg_data_wire [3:0];

        integer i;
        genvar j;

        always @ (posedge clock)
        begin
                for(i = 0; i <= 3; i = i + 1)
                begin
                        int_data_reg[i] <= {1'b0, int_data_reg[i][11:0]} + {1'b0, cfg_data_wire[i]};
                end
        end

        generate
                for (j = 0; j <= 3; j = j + 1)
                begin : PWM_DATA
                        assign cfg_data_wire[j] = cfg_data[j*12+11:j*12];
                        assign out_data[j] = int_data_reg[j][12] ? 1'bz : 1'b0;
                end
        endgenerate

endmodule