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/**************************************

* Module: iport_regster_base

* Date:2020-02-21

* Author: alireza

*

* Description:

***************************************/

`timescale 1ns / 1ps

module  flit_buffer_reg_base #(

    parameter V        =   4,

    parameter B        =   4,   // buffer space :flit per VC 

    parameter Fpay     =   32,

    parameter PCK_TYPE = "MULTI_FLIT",

    parameter DEBUG_EN =   1,

    parameter C=1,

    parameter DSTPw=4,

    parameter SSA_EN="YES" // "YES" , "NO"       

)(

    din,

    vc_num_wr,

    wr_en,

    vc_num_rd,

    rd_en,

    dout,

    vc_not_empty,

    reset,

    clk,

    //header flit dat

    class_all

);

    function integer log2;

      input integer number; begin

         log2=(number <=1) ? 1: 0;

         while(2**log2<number) begin

            log2=log2+1;

         end

      end

    endfunction // log2 

    localparam

        Cw = (C>1)? log2(C): 1,

        Vw         =   log2(V),

        REGFw      =   2+Fpay,   //Fpay + headr flags

        Fw =2+V+Fpay,

        VFw        =   V * Fw,

        VCw        =   V * Cw,

        VDSTPw     =   V * DSTPw;

    input  [Fw-1      :0]   din;     // Data in    

    input  [V-1       :0]   vc_num_wr;//write vertual chanel   

    input                   wr_en;   // Write enable

    input  [V-1       :0]   vc_num_rd;//read vertual chanel    

    input                   rd_en;   // Read the next word

    output [Fw-1       :0]  dout;    // Data out

    output [V-1        :0]  vc_not_empty;

    input                   reset;

    input                   clk;

    output [VCw-1 : 0] class_all;

   // output [VDSTPw-1 :0 ] dest_port_encoded_all;

   // input  [V-1        :0]  ssa_rd;

    wire [Fw-1       :0]  dout_all [V-1 : 0];    // Data out

    reg  [VCw-1 : 0] class_vc [V-1 : 0];

    reg [REGFw-1 : 0] flit_regs [V-1 : 0];   // a register array save the head of each quque

    reg [V-1 : 0] valid,valid_next; // if valid is asseted it shows the VC queue has a flit waiting to be sent 

    wire [Fw-1 : 0] bram_dout;

    wire [V-1 : 0] bram_not_empty;

    wire bram_wr_en;

    wire [V-1 : 0] vc_num_wr_en,vc_num_rd_en;

    wire[REGFw-1 : 0] flit_reg_mux_out;

    wire flit_reg_mux_sel;

    reg flit_reg_mux_sel_delay;

    wire [V-1 : 0] flit_reg_wr_en,pass_din_to_flit_reg,bram_empty;

    wire [V-1 : 0]  bram_out_is_valid;

    wire bram_rd_en = |(vc_num_rd_en & bram_not_empty);

    //header flit info 

    wire [Cw-1:0] class_i;

    wire [DSTPw-1 : 0] destport_i;

    wire [Vw-1: 0] vc_num_rd_bin;

    reg [Vw-1 : 0] vc_num_rd_bin_delaied;

    reg [V-1 : 0]  bram_out_is_valid_delaied,pass_din_to_flit_reg_delaied;

    reg  [Fw-1      :0]   din_reg;

    assign bram_empty = ~bram_not_empty;

    assign vc_num_wr_en = (wr_en)?    vc_num_wr : {V{1'b0}};

    assign vc_num_rd_en = (rd_en)?    vc_num_rd : {V{1'b0}};

    assign pass_din_to_flit_reg = (vc_num_wr_en & ~valid)| // a write has been recived while the reg_flit is not valid

                            (vc_num_wr_en & valid & bram_empty & vc_num_rd_en); //or its valid but bram is empty and its got a read request

    assign flit_reg_mux_sel = | pass_din_to_flit_reg ;// 1 :din, 0: bram

    //2-1 mux. Select between the bram and input flit. 

    assign flit_reg_mux_out = (flit_reg_mux_sel_delay)?   {din[Fw-1:Fw-2],din_reg[Fpay-1:0]} : {bram_dout[Fw-1:Fw-2],bram_dout[Fpay-1:0]};

    assign bram_wr_en =  (flit_reg_mux_sel)?  1'b0 :wr_en ; //make sure not write on the Bram if the reg fifo is empty 

    assign  flit_reg_wr_en = pass_din_to_flit_reg | bram_out_is_valid;

    assign  bram_out_is_valid = (bram_rd_en )? (vc_num_rd &  bram_not_empty): {V{1'b0}};

    one_hot_to_bin #(

        .ONE_HOT_WIDTH(V),

        .BIN_WIDTH(Vw)

    )

    conv

    (

        .one_hot_code(vc_num_rd),

        .bin_code(vc_num_rd_bin)

    );

    always @(posedge clk) vc_num_rd_bin_delaied<=vc_num_rd_bin;

    always @(posedge clk) pass_din_to_flit_reg_delaied<=pass_din_to_flit_reg;

    assign  dout = dout_all[vc_num_rd_bin_delaied];

    flit_buffer #(

        .V(V),

        .B(B),

        .PCK_TYPE(PCK_TYPE),

        .Fw(Fw),

        .DEBUG_EN(DEBUG_EN),

        .SSA_EN("NO")// should be "NO" even if SSA is enabled

    )

    flit_buffer

    (

        .din(din),

        .vc_num_wr(vc_num_wr),

        .wr_en(bram_wr_en),

        .vc_num_rd(vc_num_rd),

        .rd_en(bram_rd_en),

        .dout(bram_dout),

        .vc_not_empty(bram_not_empty),

        .reset(reset),

        .clk(clk),

        .ssa_rd({V{1'b0}})

    );

    always @(posedge clk) begin

        if(reset)  begin

                valid<={V{1'b0}};

                bram_out_is_valid_delaied<={V{1'b0}};

        //      din_reg<={Fw{1'b0}};

        end

        else begin

            valid<=valid_next;

                bram_out_is_valid_delaied<=bram_out_is_valid;

                din_reg<=din;

                flit_reg_mux_sel_delay<=flit_reg_mux_sel;

        end

    end

    assign vc_not_empty = valid;

     extract_header_flit_info #(

        .DATA_w(0)

     )

     header_extractor

     (

         .flit_in({flit_reg_mux_out[REGFw-1:REGFw-2],flit_reg_wr_en,flit_reg_mux_out[Fpay-1 : 0]}),

         .flit_in_wr(),

         .class_o(class_i),

         .destport_o(destport_i),

         .dest_e_addr_o( ),

         .src_e_addr_o( ),

         .vc_num_o(),

         .hdr_flit_wr_o(),

         .hdr_flg_o(),

         .tail_flg_o( ),

         .weight_o( ),

         .be_o( ),

         .data_o( )

     );

    genvar i;

    generate

    for (i = 0; i < V; i = i + 1) begin : Vblock

       // assign  dout_all[(i+1)*Fw-1 : i*Fw] = {flit_regs [i][REGFw-1: REGFw-2],i[V-1:0] ,flit_regs[i][Fpay-1:0]};

        assign  dout_all[i] = {flit_regs [i][REGFw-1: REGFw-2],i[V-1:0] ,flit_regs[i][Fpay-1:0]};

        assign  class_all[(i+1)*Cw-1 : i*Cw] = class_vc[i];

`ifdef SYNC_RESET_MODE

        always @ (posedge clk )begin

`else

        always @ (posedge clk or posedge reset)begin

`endif

            if(reset)begin

                flit_regs[i]<= {REGFw{1'b0}};

                class_vc[i]<=  {Cw{1'b0}};

            //    dest_port_encoded_vc[i]<={DSTPw{1'b0}}; 

            end

            else begin //1 :din, 0: bram

               // if(pass_din_to_flit_reg_delaied[i] & (flit_reg_mux_sel_delay==1'b0)) $display("EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE");

               // if( bram_out_is_valid_delaied[i] & flit_reg_mux_sel_delay)  $display("RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR");

                if(pass_din_to_flit_reg_delaied[i]) flit_regs[i] <= {din[Fw-1:Fw-2],din_reg[Fpay-1:0]} ;

                if(bram_out_is_valid_delaied[i])    flit_regs[i] <= {bram_dout[Fw-1:Fw-2],bram_dout[Fpay-1:0]};

                if(flit_reg_wr_en[i] & flit_reg_mux_out[REGFw-1] ) class_vc[i]<=class_i;// writing header flit 

             //   if(destport_clear[i]>0) dest_port_encoded_vc<= dest_port_encoded_vc & ~destport_clear[i];

              //  else if(flit_reg_wr_en[i] & flit_reg_mux_out[REGFw-1] ) dest_port_encoded_vc <=destport_i;

            end

        end

        /* verilator lint_off WIDTH */

         /*

        if( ROUTE_TYPE=="DETERMINISTIC") begin : dtrmn_dest

`ifdef SYNC_RESET_MODE

            always @ (posedge clk )begin

`else

            always @ (posedge clk or posedge reset)begin

`endif

                if(reset)begin

                end else begin

                    dest_port_encoded_vc[i]<= destport_in_encoded;

                end

            end//always

       end  else begin : adptv_dest

        */

        always @(*) begin

                valid_next[i] = valid[i];

                if(flit_reg_wr_en[i]) valid_next[i] =1'b1;

                else if( bram_empty[i] & vc_num_rd_en[i]) valid_next[i] =1'b0;

         end

    end //for  

     /* verilator lint_off WIDTH */

  //  if(TOPOLOGY=="FATTREE" && ROUTE_NAME == "NCA_STRAIGHT_UP") begin : fat

    /* verilator lint_on WIDTH */

 /*

     fattree_destport_up_select #(

         .K(T1),

         .SW_LOC(SW_LOC)

     )

     static_sel

     (

        .destport_in(destport_in),

        .destport_o(destport_in_encoded)

     );

    end else begin : other

        assign destport_in_encoded = destport_in;

    end

  */

    endgenerate

    // Update header flit info registers

endmodule