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`include "pronoc_def.v"

//`define MONITORE_PATH

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

 **     File: router.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 .

 **

 **

 **     Description:

 **     A two stage router

 **   stage1: lk-route,sw/VC allocation

 **   stage2: switch-traversal

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

module router_two_stage

                import pronoc_pkg::*;

                # (

                        parameter P = 6     // router port num

                )(

                current_r_id,

                current_r_addr,// connected to constant parameter

                chan_in,

                chan_out,

                ctrl_in,

                ctrl_out,

                //internal router status

                ivc_info,

                ovc_info,

                iport_info,

                oport_info,

                smart_ctrl_in,

                clk,

                reset

                );

        // The current/neighbor routers addresses/port. These values are fixed in each router and they are supposed to be given as parameter.

        // However, in order to give an identical RTL code to each router, they are given as input ports. The identical RTL code reduces the

        // compilation time. Note that they wont be implemented as  input ports in the final synthesized code.

        input [RAw-1 :  0]  current_r_addr;

        input [31:0] current_r_id;

        input   flit_chanel_t chan_in  [P-1 : 0];

        output  flit_chanel_t chan_out [P-1 : 0];

        input   ctrl_chanel_t ctrl_in  [P-1 : 0];

        output  ctrl_chanel_t ctrl_out [P-1 : 0];

        input   clk,reset;

        output  ivc_info_t       ivc_info    [P-1 : 0][V-1 : 0];

        output  ovc_info_t   ovc_info    [P-1 : 0][V-1 : 0];

        output  iport_info_t iport_info  [P-1 : 0];

        output  oport_info_t oport_info  [P-1 : 0];

        input   smart_ctrl_t   smart_ctrl_in [P-1 : 0];

        vsa_ctrl_t   vsa_ctrl    [P-1 : 0];

        localparam

                PV = V * P,

                VV = V*V,

                PVV = PV * V,

                P_1 = ( SELF_LOOP_EN=="NO")?  P-1 : P,

                PP_1 = P_1 * P,

                PVP_1 = PV * P_1,

                PFw = P*Fw,

                CONG_ALw = CONGw* P,    //  congestion width per router

                W = WEIGHTw,

                WP = W * P,

                WPP=  WP * P,

                PRAw= P * RAw;

        flit_chanel_t chan_in_tmp  [P-1 : 0];

        wire  [PFw-1 :  0]  flit_in_all;

        wire  [P-1 :  0]  flit_in_wr_all;

        wire  [PV-1 :  0]  credit_out_all;

        wire  [CONG_ALw-1 :  0]  congestion_in_all;

        wire  [PFw-1 :  0]  flit_out_all;

        wire  [P-1 :  0]  flit_out_wr_all;

        wire  [PV-1 :  0]  credit_in_all;

        wire  [CONG_ALw-1 :  0]  congestion_out_all;

        wire  [PV-1 : 0] credit_release_out;

        // old router verilog code

        //internal wires

        wire  [PV-1 : 0] ovc_allocated_all;

        wire  [PVV-1 : 0] granted_ovc_num_all;

        wire  [PV-1 : 0] ivc_num_getting_sw_grant;

        wire  [PV-1 : 0] ivc_num_getting_ovc_grant;

        wire  [PVV-1 : 0] spec_ovc_num_all;

        wire  [PV-1 : 0] nonspec_first_arbiter_granted_ivc_all;

        wire  [PV-1 : 0] spec_first_arbiter_granted_ivc_all;

        wire  [PP_1-1 : 0] nonspec_granted_dest_port_all;

        wire  [PP_1-1 : 0] spec_granted_dest_port_all;

        wire  [PP_1-1 : 0] granted_dest_port_all;

        wire  [P-1 : 0] any_ivc_sw_request_granted_all;

        wire  [P-1 :  0] any_ovc_granted_in_outport_all;

        wire  [P-1 : 0] granted_dst_is_from_a_single_flit_pck;

        // to vc/sw allocator

        wire  [PVP_1-1 :  0] dest_port_all;

        wire  [PV-1 : 0] ovc_is_assigned_all;

        wire  [PV-1 : 0] ivc_request_all;

        wire  [PV-1 : 0] assigned_ovc_not_full_all;

        wire  [PVV-1: 0] masked_ovc_request_all;

        wire  [PV-1 : 0] vc_weight_is_consumed_all;

        wire  [P-1  : 0] iport_weight_is_consumed_all;

    wire  [PV-1 : 0] vsa_ovc_released_all;

    wire  [PV-1 : 0] vsa_credit_decreased_all;

        // to/from the crossbar

        wire  [PFw-1 : 0] iport_flit_out_all;

        wire  [P-1 : 0] ssa_flit_wr_all;

        logic [PP_1-1 : 0] granted_dest_port_all_delayed;

        wire  [PFw-1 :  0]  crossbar_flit_out_all;

        wire  [P-1   :  0]  crossbar_flit_out_wr_all;

        wire  [PFw-1 :  0]  link_flit_out_all;

        wire  [P-1   :  0]  link_flit_out_wr_all;

        wire  [PV-1  :  0] flit_is_tail_all;

        //to weight control

        wire [WP-1 : 0] iport_weight_all;

        wire [WPP-1: 0] oports_weight_all;

        wire refresh_w_counter;

        //ctrl port

        wire [PRAw-1  :  0] neighbors_r_addr;

        wire [CRDTw-1 : 0 ] credit_init_val_in  [P-1 : 0][V-1 : 0];

        wire [CRDTw-1 : 0 ] credit_init_val_out [P-1 : 0][V-1 : 0];

        genvar i,j;

        generate

                for (i=0; i

                        if(CAST_TYPE == "UNICAST") begin : uni

                                assign chan_in_tmp[i] = chan_in[i];

                        end else begin : multi

                                multicast_chan_in_process #(

                                        .P(P),

                                        .SW_LOC  (i)

                                ) multicast_process (

                                        .endp_port       (ctrl_in[i].endp_port),

                                        .current_r_addr  (current_r_addr ),

                                        .chan_in         (chan_in[i]     ),

                                        .chan_out        (chan_in_tmp[i] ),

                                        .clk                     (clk)

                                );

                        end

                        assign  neighbors_r_addr  [(i+1)*RAw-1:  i*RAw] = ctrl_in[i].neighbors_r_addr;

                        assign  flit_in_all       [(i+1)*Fw-1:  i*Fw] = chan_in_tmp[i].flit;

                        assign  flit_in_wr_all    [i] = chan_in_tmp[i].flit_wr;

                        assign  credit_in_all     [(i+1)*V-1:  i*V] = chan_in_tmp[i].credit;

                        assign  congestion_in_all [(i+1)*CONGw-1:  i*CONGw] = chan_in_tmp[i].congestion;

                        assign  ctrl_out[i].neighbors_r_addr = current_r_addr;

                        assign  ctrl_out[i].endp_port =1'b0;

                        assign  chan_out[i].flit=          flit_out_all       [(i+1)*Fw-1:  i*Fw];

                        assign  chan_out[i].flit_wr=       flit_out_wr_all    [i];

                        assign  chan_out[i].credit=        credit_out_all     [(i+1)*V-1:  i*V] | credit_release_out [(i+1)*V-1:  i*V];

                        assign  chan_out[i].congestion=    congestion_out_all [(i+1)*CONGw-1:  i*CONGw];

                        assign  iport_info[i].swa_first_level_grant =nonspec_first_arbiter_granted_ivc_all[(i+1)*V-1:  i*V];

                        assign  iport_info[i].swa_grant = ivc_num_getting_sw_grant[(i+1)*V-1:  i*V];

                        assign  iport_info[i].any_ivc_get_swa_grant=    any_ivc_sw_request_granted_all[i];

                        assign  iport_info[i].ivc_req = ivc_request_all [(i+1)*V-1:  i*V];

                        assign  vsa_ctrl[i].ovc_is_allocated = ovc_allocated_all [(i+1)*V-1:  i*V];

                        assign  vsa_ctrl[i].ovc_is_released  = vsa_ovc_released_all[(i+1)*V-1:  i*V];

                        assign  vsa_ctrl[i].ivc_num_getting_sw_grant = ivc_num_getting_sw_grant [(i+1)*V-1:  i*V];

                        assign  vsa_ctrl[i].ivc_num_getting_ovc_grant=ivc_num_getting_ovc_grant [(i+1)*V-1:  i*V];

                        assign  vsa_ctrl[i].ivc_reset=flit_is_tail_all[(i+1)*V-1:  i*V] & ivc_num_getting_sw_grant[(i+1)*V-1:  i*V];

                        assign  vsa_ctrl[i].buff_space_decreased =  vsa_credit_decreased_all[(i+1)*V-1:  i*V];

                        assign  vsa_ctrl[i].ivc_granted_ovc_num = granted_ovc_num_all[(i+1)*VV-1:  i*VV];

                        if(SELF_LOOP_EN == "NO") begin :nslp

                                add_sw_loc_one_hot #(

                                                .P(P),

                                                .SW_LOC(i)

                                        )add

                                        (

                                                .destport_in(granted_dest_port_all[(i+1)*P_1-1:  i*P_1]),

                                                .destport_out(iport_info[i].granted_oport_one_hot[P-1 : 0])

                                        );

                        end else begin :slp

                                assign iport_info[i].granted_oport_one_hot[P-1 : 0] = granted_dest_port_all[(i+1)*P_1-1:  i*P_1];

                        end

                        for (j=0;j

                                //credit_release. Only activated for local ports as credit_release_en never be asserted in router to router connection.

                                credit_release_gen #(

                                        .CREDIT_NUM  (LB)

                                ) credit_release_gen (

                                        .clk         (clk        ),

                                        .reset       (reset      ),

                                        .en          (ctrl_in[i].credit_release_en[j] ),

                                        .credit_out  (credit_release_out[i*V+j] )

                                );

                                assign ctrl_out[i].credit_release_en[j] =1'b0;

                                assign credit_init_val_in[i][j]       = ctrl_in[i].credit_init_val[j];

                                assign ctrl_out[i].credit_init_val[j] = credit_init_val_out [i][j];

                        end

                end

        endgenerate

        inout_ports

                #(

                        .P(P)

                )

                the_inout_ports

                (

                        .current_r_addr(current_r_addr),

                        .neighbors_r_addr(neighbors_r_addr),

                        .flit_in_all(flit_in_all),

                        .flit_in_wr_all(flit_in_wr_all),

                        .credit_out_all(credit_out_all),

                        .credit_in_all(credit_in_all),

                        .masked_ovc_request_all(masked_ovc_request_all),

                        .granted_dst_is_from_a_single_flit_pck(granted_dst_is_from_a_single_flit_pck),

                        .vsa_ovc_allocated_all(ovc_allocated_all),

                        .granted_ovc_num_all(granted_ovc_num_all),

                        .ivc_num_getting_ovc_grant(ivc_num_getting_ovc_grant),

                        .spec_ovc_num_all(spec_ovc_num_all),

                        .nonspec_first_arbiter_granted_ivc_all(nonspec_first_arbiter_granted_ivc_all),

                        .spec_first_arbiter_granted_ivc_all(spec_first_arbiter_granted_ivc_all),

                        .nonspec_granted_dest_port_all(nonspec_granted_dest_port_all),

                        .spec_granted_dest_port_all(spec_granted_dest_port_all),

                        .granted_dest_port_all(granted_dest_port_all),

                        .any_ivc_sw_request_granted_all(any_ivc_sw_request_granted_all),

                        .any_ovc_granted_in_outport_all(any_ovc_granted_in_outport_all),

                        .dest_port_all(dest_port_all),

                        .ovc_is_assigned_all(ovc_is_assigned_all),

                        .ivc_request_all(ivc_request_all),

                        .assigned_ovc_not_full_all(assigned_ovc_not_full_all),

                        .flit_out_all(iport_flit_out_all),

                        .congestion_in_all(congestion_in_all),

                        .congestion_out_all(congestion_out_all),

                        //  .lk_destination_all(lk_destination_all),

                        .ssa_flit_wr_all(ssa_flit_wr_all),

                        .iport_weight_all(iport_weight_all),

                        .oports_weight_all(oports_weight_all),

                        .vc_weight_is_consumed_all(vc_weight_is_consumed_all),

                        .iport_weight_is_consumed_all(iport_weight_is_consumed_all),

                        .refresh_w_counter(refresh_w_counter),

                        .clk(clk),

                        .reset(reset),

                        .ivc_info(ivc_info),

                        .ovc_info(ovc_info),

                        .oport_info(oport_info),

                        .smart_ctrl_in(smart_ctrl_in),

                        .vsa_ctrl_in(vsa_ctrl),

                        .credit_init_val_in (credit_init_val_in),

                        .credit_init_val_out (credit_init_val_out),

                        .flit_is_tail_all(flit_is_tail_all),

                        .crossbar_flit_out_wr_all(crossbar_flit_out_wr_all),

                        .vsa_ovc_released_all(vsa_ovc_released_all),

                        .vsa_credit_decreased_all(vsa_credit_decreased_all)

                );

        combined_vc_sw_alloc #(

                        .P(P)

                )

                vsa

                (

                        .dest_port_all(dest_port_all),

                        .masked_ovc_request_all(masked_ovc_request_all),

                        .granted_dst_is_from_a_single_flit_pck(granted_dst_is_from_a_single_flit_pck),

                        .ovc_allocated_all(ovc_allocated_all),

                        .granted_ovc_num_all(granted_ovc_num_all),

                        .ivc_num_getting_ovc_grant(ivc_num_getting_ovc_grant),

                        .ivc_num_getting_sw_grant(ivc_num_getting_sw_grant),

                        .spec_first_arbiter_granted_ivc_all(spec_first_arbiter_granted_ivc_all),

                        .nonspec_first_arbiter_granted_ivc_all(nonspec_first_arbiter_granted_ivc_all),

                        .nonspec_granted_dest_port_all(nonspec_granted_dest_port_all),

                        .spec_granted_dest_port_all(spec_granted_dest_port_all),

                        .granted_dest_port_all(granted_dest_port_all),

                        .any_ivc_sw_request_granted_all(any_ivc_sw_request_granted_all),

                        .any_ovc_granted_in_outport_all(any_ovc_granted_in_outport_all),

                        .spec_ovc_num_all(spec_ovc_num_all),

                        // .lk_destination_all(lk_destination_all),

                        .vc_weight_is_consumed_all(vc_weight_is_consumed_all),

                        .iport_weight_is_consumed_all(iport_weight_is_consumed_all),

                        .ivc_info(ivc_info),

                        .clk(clk),

                        .reset(reset)

                );

        pronoc_register #(.W(PP_1)) reg2 (.in(granted_dest_port_all ), .out(granted_dest_port_all_delayed), .reset(reset), .clk(clk));

                crossbar #(

                                .TOPOLOGY(TOPOLOGY),

                                .V (V),     // vc_num_per_port

                                .P (P),     // router port num

                                .Fw (Fw),

                                .MUX_TYPE (MUX_TYPE),

                                .SSA_EN (SSA_EN),

                                .SELF_LOOP_EN(SELF_LOOP_EN)

                        )

                        the_crossbar

                        (

                                .granted_dest_port_all (granted_dest_port_all_delayed),

                                .flit_in_all (iport_flit_out_all),

                                .ssa_flit_wr_all (ssa_flit_wr_all),

                                .flit_out_all (crossbar_flit_out_all),

                                .flit_out_wr_all (crossbar_flit_out_wr_all)

                        );

                //link reg

                generate

                //if( ADD_PIPREG_AFTER_CROSSBAR == 1 || SMART_EN == 1) begin :link_reg

                if( ADD_PIPREG_AFTER_CROSSBAR == 1 ) begin :link_reg

                        reg [PFw-1 : 0] flit_out_all_pipe;

                        reg [P-1 : 0] flit_out_wr_all_pipe;

                        pronoc_register #(.W(PFw)) reg1 (.in(crossbar_flit_out_all    ), .out(flit_out_all_pipe), .reset(reset), .clk(clk));

                        pronoc_register #(.W(P)  ) reg2 (.in(crossbar_flit_out_wr_all ), .out(flit_out_wr_all_pipe), .reset(reset), .clk(clk));

                        assign link_flit_out_all    = flit_out_all_pipe;

                        assign link_flit_out_wr_all = flit_out_wr_all_pipe;

                end else begin :no_link_reg

                        assign    link_flit_out_all     =   crossbar_flit_out_all;

                        assign    link_flit_out_wr_all  =   crossbar_flit_out_wr_all;

                end

                /* verilator lint_off WIDTH */

                if (SWA_ARBITER_TYPE != "RRA" ) begin : wrra_

                /* verilator lint_on WIDTH */

                        wire [WP-1 : 0] contention_all;

                        wire [WP-1 : 0] limited_oport_weight_all;

                        wrra_contention_gen #(

                                .WEIGHTw(WEIGHTw),

                                .WRRA_CONFIG_INDEX(WRRA_CONFIG_INDEX),

                                .V(V),

                                .P(P),

                                .SELF_LOOP_EN(SELF_LOOP_EN)

                        )

                        contention_gen

                        (

                                .limited_oport_weight_all(limited_oport_weight_all),

                                .dest_port_all(dest_port_all),

                                .ivc_request_all(ivc_request_all),

                                .ovc_is_assigned_all(ovc_is_assigned_all),

                                .contention_all(contention_all),

                                .iport_weight_all(iport_weight_all),

                                .oports_weight_all(oports_weight_all)

                        );

                        weights_update #(

                                .ARBITER_TYPE(SWA_ARBITER_TYPE),

                                .V(V),

                                .P(P),

                                .Fw(Fw),

                                .WEIGHTw(WEIGHTw),

                                .WRRA_CONFIG_INDEX(WRRA_CONFIG_INDEX),

                                .C(C),

                                .TOPOLOGY(TOPOLOGY),

                                .EAw(EAw),

                                .DSTPw(DSTPw),

                                .ADD_PIPREG_AFTER_CROSSBAR(ADD_PIPREG_AFTER_CROSSBAR)

                        )

                        updater

                        (

                                .limited_oports_weight(limited_oport_weight_all),

                                .refresh_w_counter(refresh_w_counter),

                                .iport_weight_all(iport_weight_all),

                                .contention_all(contention_all),

                                .flit_in_all(link_flit_out_all),

                                .flit_out_all(flit_out_all),

                                .flit_out_wr_all(flit_out_wr_all),

                                .clk(clk),

                                .reset(reset)

                        );

        end // WRRA

        else begin : rra_

                assign flit_out_all  =  link_flit_out_all;

                assign refresh_w_counter = 1'b0;

        end

        endgenerate

                assign  flit_out_wr_all = link_flit_out_wr_all;

                //synthesis translate_off

                //synopsys  translate_off

                generate

                /* verilator lint_off WIDTH */

                if(DEBUG_EN && TOPOLOGY == "MESH")begin :dbg

                /* verilator lint_on WIDTH */

                debug_mesh_edges #(

                        .T1(T1),

                        .T2(T2),

                        .T3(T3),

                        .T4(T4),

                        .RAw(RAw),

                        .P(P)

                )

                debug_edges

                (

                        .clk(clk),

                        .current_r_addr(current_r_addr),

                        .flit_out_wr_all(flit_out_wr_all)

                );

        end// DEBUG

                endgenerate

                // synopsys  translate_on

                // synthesis translate_on

                // for testing the route path

                // synthesis translate_off

                // synopsys  translate_off

                `ifdef MONITORE_PATH

                reg[P-1 :0] t1,t2;

                generate

                        for (i=0;i

                                always @(posedge clk) begin

                                        if(reset)begin

                                                t1[i]<=1'b0;

                                                t2[i]<=1'b0;

                                        end else begin

                                                if(flit_out_wr_all[i]>0 && t2[i]==0)begin

                                                        $display("%t :Out router (id=%d, addr=%h, port=%d), flitout=%h",$time,current_r_id,current_r_addr,i,flit_out_all[(i+1)*Fw-1 : i*Fw]);

                                                        t2[i]<=1;

                                                end

                                                if(flit_in_wr_all[i]>0 && t1[i]==0)begin

                                                        $display("%t :In router (id=%d, addr=%h, port=%d), flitin=%h",$time,current_r_id,current_r_addr,i,flit_in_all[(i+1)*Fw-1 : i*Fw]);

                                                        t1[i]<=1;

                                                end

                                        end

                                end

                        end

                endgenerate

        `endif

        /*

    reg [10 :  0]  counter;

    reg [31 :  0]  flit_counter;

    always @ (`pronoc_clk_reset_edge )begin

                if(`pronoc_reset) begin

            flit_counter <=0;

            counter <= 0;

        end else begin

            if(flit_in_wr_all>0 )begin

                counter <=0;

                flit_counter<=flit_counter+1'b1;

            end else begin

                counter <= counter+1'b1;

                if( counter == 512 ) $display("%t : total flits received in (x=%d,Y=%d) is %d ",$time,current_r_addr,current_y,flit_counter);

            end

        end

    end

         */

        //synopsys  translate_on

        //synthesis translate_on

endmodule

module credit_release_gen

        import pronoc_pkg::*;

#(

        parameter CREDIT_NUM=4

)(

        clk,

        reset,

        en,

        credit_out

);

        input  clk,     reset;

        input  en;

        output reg credit_out;

        localparam W=log2(CREDIT_NUM +1);

        reg [W-1 : 0] counter;

        wire counter_is_zero = counter=={W{1'b0}};

        wire counter_is_max = counter==CREDIT_NUM;

        wire counter_incr = (en & counter_is_zero ) | (~counter_is_zero & ~counter_is_max);

        always @ (`pronoc_clk_reset_edge )begin

                if(`pronoc_reset) begin

                        counter <= {W{1'b0}};

                        credit_out<=1'b0;

                end else begin

                        if(counter_incr) begin

                                counter<= counter +1'b1;

                                credit_out<=1'b1;

                        end else begin

                                credit_out<=1'b0;

                        end

                end

        end

endmodule