source: trunk/MultiChannelUSB/adc_lvds.v@ 66

module adc_lvds
        #(
                parameter       size    =       3, // number of channels
                parameter       width   =       12 // channel resolution
        )
        (
                input   wire                                            lvds_dco,
                input   wire                                            lvds_fco,
                input   wire    [2:0]                           lvds_d,

                output  wire    [size*width-1:0]        adc_data
        );

        wire    [size-1:0]      int_data_h, int_data_l;
        reg     [width-1:0]     int_data_next [size-1:0];
        reg     [width-1:0]     int_data_reg [size-1:0];

        reg     [width-1:0]     int_adc_data [size-1:0];

        integer i;
        genvar j;

        altddio_in #(
                .intended_device_family("Cyclone III"),
                .invert_input_clocks("ON"),
                .lpm_type("altddio_in"),
                .width(size)) altddio_in_unit (
                .datain(lvds_d),
                .inclock(lvds_dco),
                .aclr(1'b0),
                .dataout_h(int_data_h),
                .dataout_l(int_data_l),
                .aset(1'b0),
                .inclocken(1'b1),
                .sclr(1'b0),
                .sset(1'b0));

        always @ (posedge lvds_dco)
        begin
                for (i = 0; i < size; i = i + 1)
                begin
                        int_data_reg[i] <= int_data_next[i];
                end
        end

        always @ (posedge lvds_fco)
        begin
                for (i = 0; i < size; i = i + 1)
                begin
                        int_adc_data[i] <= int_data_next[i];
                end
        end

        always @*
        begin
                for (i = 0; i < size; i = i + 1)
                begin
                        int_data_next[i] = {int_data_reg[i][9:0], int_data_l[i], int_data_h[i]};
                end
        end

        generate
                for (j = 1; j < size; j = j + 1)
                begin : ADC_LVDS_OUTPUT
                        assign adc_data[j*width+width-1:j*width] = int_adc_data[j];
                end
        endgenerate

endmodule