module  P_NCO # (
   parameter WIDTH = 16
   , parameter PARALLEL = 16
)(
 input                  clk
,input                  rstn
,input                  clr
,input                  clr_acc
,input    [15     :0]   ptw
,input                  p2a_en
      
,input    [15     :0]   s1
,input    [15     :0]   s2
,input    [15     :0]   s3
       
,output   [15     :0]   s1_o
,output   [15     :0]   s2_o
,output   [15     :0]   s3_o
     
,input    [47     :0]   fcw [PARALLEL-1:0]//fcw[0]=16*fcw; fcw[i]=i*fcw, i=1,2,...,15
 
,output   [WIDTH-1:0]   cos [PARALLEL-1:0]
,output   [WIDTH-1:0]   sin [PARALLEL-1:0]
);

wire     [15:0]     cos_16bit [PARALLEL-1:0];
wire     [15:0]     sin_16bit [PARALLEL-1:0];

reg      [15:0]     ptw_r;
always@(posedge clk or negedge rstn)
    if(!rstn)
        ptw_r   <=  16'd0;
    else
        ptw_r   <=  ptw;

wire     [18:0]     pha [PARALLEL-1:0];

PIPE3_ACC_48BIT inst_pipe_0(
     .clk       (clk        )
    ,.rstn      (rstn       )
    ,.in        (fcw[0]     )
    ,.clr       (clr_acc    )
    ,.en        (1'b1       )
    ,.ptw       (ptw        )
    ,.s_o_1     (s1_o       )
    ,.s_o_2     (s2_o       )
    ,.s_o_3     (s3_o       )
    ,.s_i_1     (s1         )
    ,.s_i_2     (s2         )
    ,.s_i_3     (s3         )
    ,.out       (pha[0]     ));

reg     [18:0]  pha_0_r;
always@(posedge clk or negedge rstn)
    if(!rstn)
        pha_0_r <=  16'd0;
    else if (p2a_en == 1'b0)
        pha_0_r <=  16'd0;
    else
        pha_0_r <=  pha[0];

PH2AMP inst_ph2amp_0(
        .clk     (clk         ),
        .rstn    (rstn        ),
        .pha_map (pha_0_r     ),
        .sin_o   (sin_16bit[0]),
        .cos_o   (cos_16bit[0])	
        );
assign cos[0] = cos_16bit[0][15:16-WIDTH];
assign sin[0] = sin_16bit[0][15:16-WIDTH];

genvar i;
generate
    for(i = 1; i < PARALLEL; i++) begin

        PIPE3_ADD_48BIT inst_pipe_i(
             .clk       (clk         )
            ,.rstn      (rstn        )
            ,.in        (fcw[i]      )
            ,.clr       (clr         )
            ,.en        (p2a_en      )
            ,.ptw       (ptw_r       )
            ,.s1        (s1          )
            ,.s2        (s2          )
            ,.s3        (s3          )
            ,.out       (pha[i]      ));

        PH2AMP inst_ph2amp_i(
             .clk       (clk         )
            ,.rstn      (rstn        )
            ,.pha_map   (pha[i]      )
            ,.sin_o     (sin_16bit[i])
            ,.cos_o     (cos_16bit[i]));

        assign cos[i] = cos_16bit[i][15:16-WIDTH];
        assign sin[i] = sin_16bit[i][15:16-WIDTH];
    end
endgenerate



endmodule