`timescale     1ns/1ps
/**********************************************************************
**	File: crossbar.v
**    
**	Copyright (C) 2014-2017  Alireza Monemi
**    
**	This file is part of ProNoC 
**
**	ProNoC ( stands for Prototype Network-on-chip)  is free software: 
**	you can redistribute it and/or modify it under the terms of the GNU
**	Lesser General Public License as published by the Free Software Foundation,
**	either version 2 of the License, or (at your option) any later version.
**
** 	ProNoC is distributed in the hope that it will be useful, but WITHOUT
** 	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
** 	or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
** 	Public License for more details.
**
** 	You should have received a copy of the GNU Lesser General Public
** 	License along with ProNoC. If not, see <http:**www.gnu.org/licenses/>.
**
**
**	Description: 
**	NoC router crosbar module
**
**************************************************************/

module crossbar #(
    parameter TOPOLOGY = "MESH",
    parameter V    = 4,     // vc_num_per_port
    parameter P    = 5,     // router port num
    parameter Fw     = 36,
    parameter MUX_TYPE="BINARY",        //"ONE_HOT" or "BINARY"    
    parameter SSA_EN="YES", // "YES" , "NO"
    parameter SELF_LOOP_EN= "NO"
)
(
    granted_dest_port_all,
    flit_in_all,
    flit_out_all,
    flit_out_wr_all,
    ssa_flit_wr_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 
        PV = V * P,
        VV = V * V,
        PP = P * P,        
        PVV = PV * V,    
        P_1 = (SELF_LOOP_EN == "NO")? P-1 : P,
        VP_1 = V * P_1,                
        PP_1 = P_1 * P,
        PVP_1 = PV * P_1,
        PFw = P*Fw,
        P_1Fw = P_1 * Fw,
        P_1w = log2(P_1);
    
    
    input [PP_1-1 : 0] granted_dest_port_all;
    input [PFw-1 : 0] flit_in_all;
    output [PFw-1 : 0] flit_out_all;
    output [P-1 : 0] flit_out_wr_all;
    input  [P-1 : 0] ssa_flit_wr_all;
  

    wire [P-1 : 0]  flit_we_mux_out;
    wire [P_1-1 : 0] granted_dest_port [P-1 : 0];
    wire [P_1Fw-1 : 0] mux_in [P-1 : 0];
    wire [P_1-1 : 0] mux_sel_pre [P-1 : 0];
    wire [P_1-1 : 0]  mux_sel [P-1 : 0];
    wire [P_1w-1 : 0] mux_sel_bin [P-1 : 0];
    wire [PP-1 : 0] flit_out_wr_gen;
    
    genvar i,j;
    generate
    for(i=0;i<P;i=i+1)begin : port_loop
        assign granted_dest_port[i] = granted_dest_port_all[(i+1)*P_1-1 : i*P_1];
        for(j=0;j<P;j=j+1)begin : port_loop2 
            if(SELF_LOOP_EN == "NO") begin : nslp
                //remove sender port flit from flit list
                if(i>j)    begin :if1
                    assign mux_in[i][(j+1)*Fw-1 : j*Fw]=     flit_in_all[(j+1)*Fw-1 : j*Fw];
                    assign mux_sel_pre[i][j] =    granted_dest_port[j][i-1];
                end
                else if(i<j) begin :if2
                    assign mux_in[i][j*Fw-1 : (j-1)*Fw]=     flit_in_all[(j+1)*Fw-1 : j*Fw];
                    assign mux_sel_pre[i][j-1] =    granted_dest_port[j][i];
                end
            end else begin : slp
                assign mux_in[i][(j+1)*Fw-1 : j*Fw]=     flit_in_all[(j+1)*Fw-1 : j*Fw];
                assign mux_sel_pre[i][j] =    granted_dest_port[j][i];            
            end
        end//for j
        
        
        
        /* verilator lint_off WIDTH */
        if (SSA_EN =="YES")begin :predict //If no output is granted replace the output port with SS port
        /* verilator lint_on WIDTH */
            add_ss_port #(               
                .SW_LOC(i),
    		    .P(P)
            )
            ss_port
            (
                .destport_in (mux_sel_pre[i]),
                .destport_out(mux_sel [i])
            );        
        
        end else begin :nopredict
               assign mux_sel[i]= mux_sel_pre[i];
          
        end
        
        /* verilator lint_off WIDTH */
        if    (MUX_TYPE    ==    "ONE_HOT") begin : one_hot_gen
        /* verilator lint_on WIDTH */
            onehot_mux_1D #(
                .W (Fw),
                .N (P_1)
            )
            cross_mux
            (
                .in (mux_in [i]),
                .out (flit_out_all[(i+1)*Fw-1 : i*Fw]),
                .sel (mux_sel[i])
    
            );
        end else begin : binary
        
            one_hot_to_bin #(
                .ONE_HOT_WIDTH(P_1),
                .BIN_WIDTH(P_1w)
            )
            conv
            (
                .one_hot_code(mux_sel[i]),
                .bin_code(mux_sel_bin[i])
        
            );
            
            
            binary_mux #(
                .IN_WIDTH(P_1Fw),
                .OUT_WIDTH(Fw)
            )
            cross_mux
            (
                .mux_in(mux_in [i]),
                .mux_out(flit_out_all[(i+1)*Fw-1 : i*Fw]),
                .sel(mux_sel_bin[i])
        
            );
        end//binary
    
    
        if(SELF_LOOP_EN == "NO") begin : nslp
            add_sw_loc_one_hot #(
                .P(P),
                .SW_LOC(i)
            )
            add_sw_loc
            (
                .destport_in(granted_dest_port_all[(i+1)*P_1-1 : i*P_1]),
                .destport_out(flit_out_wr_gen [(i+1)*P-1 : i*P])
            );
        end else begin :slp 
            assign flit_out_wr_gen [(i+1)*P-1 : i*P] = granted_dest_port_all[(i+1)*P_1-1 : i*P_1];
        end
     
    end//for i    
    endgenerate
    
    custom_or #(
        .IN_NUM(P),
        .OUT_WIDTH(P)
    )
    wide_or
    (
        .or_in(flit_out_wr_gen),
        .or_out(flit_we_mux_out)
    );
    
    assign    flit_out_wr_all = flit_we_mux_out | ssa_flit_wr_all;
    
       
    
endmodule
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