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/*

 Asynchronous SDM NoC

 (C)2011 Wei Song

 Advanced Processor Technologies Group

 Computer Science, the Univ. of Manchester, UK

 Authors:

 Wei Song     wsong83@gmail.com

 License: LGPL 3.0 or later

 The routing calculation unit in every input buffer.

 p0 -> L -> p1 -> RTC -> p2 -> L -> p3 -> DEMUX -> p[0] -> L -> p[1] -> L -> p[2] -> L -> p[3] -> L -> p[4]

 History:

 02/04/2010  Initial version. <wsong83@gmail.com>

 02/06/2011  Clean up for opensource. <wsong83@gmail.com>

 09/06/2011  The selection pin of the demux must be considered in the ack process. <wsong83@gmail.com>

*/

module rtu (/*AUTOARG*/

   // Outputs

   dia, dort,

   // Inputs

   rst_n, di0, di1, di2, di3, dit, divc, addrx, addry, doa

   );

   parameter VCN = 2;

   parameter DIR = 0;

   parameter SN = 4;

   parameter PD = 2;

   input            rst_n;

   input [3:0]      di0, di1, di2, di3;

   input [2:0]       dit;

   input [VCN-1:0]  divc;

   output           dia;

   input [7:0]       addrx, addry;

   output [VCN-1:0][SN-1:0] dort;

   input [VCN-1:0]           doa;

   //------------------------------------------

   wire             p0an, p0ap, p0den, p0ad, p0avc;

   wire [3:0]        p1d0, p1d1, p1d2, p1d3;

   wire [VCN-1:0]   p1vc;

   wire             p1a, p1ad, p1avc, p1an;

   wire [SN-1:0]    p2d;

   wire [VCN-1:0]   p2vc;

   wire             p2a, p2ad, p2avc, p2an;

   wire [SN-1:0]    p3d;

   wire [VCN-1:0]   p3vc;

   wire             p3a, p3an;

   wire [PD*2:0][VCN-1:0][SN-1:0] pd;

   wire [PD*2:0][VCN-1:0]           pda, pdan;

   wire [2:0]                      x_cmp [1:0];

   wire [2:0]                      y_cmp [1:0];

   wire [5:0]                      dec;

   wire                           ds, dw, dn, de, dl;

   genvar                         gvc, gbd, i;

   //------------------------------------------

   // p0 -> L -> p1

   c2 CP0DE ( .a0(dit[0]), .a1(p1an), .q(p0den));

   c2 CP0A  ( .a0(p0ad), .a1(p0avc), .q(p0ap));

   assign p0an = |dit[2:1];

   assign dia = p0an | p0ap;

   pipe4 #(.DW(8))

   L0D (

        .ia ( p0ad   ),

        .o0 ( p1d0   ),

        .o1 ( p1d1   ),

        .o2 ( p1d2   ),

        .o3 ( p1d3   ),

        .i0 ( di0    ),

        .i1 ( di1    ),

        .i2 ( di2    ),

        .i3 ( di3    ),

        .oa ( p0den  )

        );

   pipen #(.DW(VCN))

   L0V (

        .d_in    ( divc    ),

        .d_in_a  ( p0avc   ),

        .d_out   ( p1vc    ),

        .d_out_a ( p0den   )

        );

   // p1 -> RTC -> p2

   comp4 X0 ( .a({p1d3[0], p1d2[0], p1d1[0], p1d0[0]}), .b(addrx[3:0]), .q(x_cmp[0]));

   comp4 X1 ( .a({p1d3[1], p1d2[1], p1d1[1], p1d0[1]}), .b(addrx[7:4]), .q(x_cmp[1]));

   comp4 Y0 ( .a({p1d3[2], p1d2[2], p1d1[2], p1d0[2]}), .b(addry[3:0]), .q(y_cmp[0]));

   comp4 Y1 ( .a({p1d3[3], p1d2[3], p1d1[3], p1d0[3]}), .b(addry[7:4]), .q(y_cmp[1]));

   assign dec[0] = x_cmp[1][0] | (x_cmp[1][2]&x_cmp[0][0]);       // frame x > addr x

   assign dec[1] = x_cmp[1][1] | (x_cmp[1][2]&x_cmp[0][1]);       // frame x < addr x

   assign dec[2] = x_cmp[1][2] & x_cmp[0][2];                     // frame x = addr x

   assign dec[3] = y_cmp[1][0] | (y_cmp[1][2]&y_cmp[0][0]);       // frame y > addr y

   assign dec[4] = y_cmp[1][1] | (y_cmp[1][2]&y_cmp[0][1]);       // frame y < addr y

   assign dec[5] = y_cmp[1][2] & y_cmp[0][2];                     // frame y = addr y

   assign ds = dec[0];

   assign dw = dec[2]&dec[4];

   assign dn = dec[1];

   assign de = dec[2]&dec[3];

   assign dl = dec[2]&dec[5];

   assign p2d =

                   DIR == 0 ?   {dl, de, dn, dw}  :       // south port

                   DIR == 1 ?   {dl, de}          :       // west port

                   DIR == 2 ?   {dl, de, dw, ds}  :       // north port

                   DIR == 3 ?   {dl, dw}          :       // east port

                                {de, dn, dw, ds}  ;       // local port

   assign p2vc = p1vc;

   assign p1an = p2an;

   // p2 -> L -> p3

   c2 CP2A  ( .a0(p2ad), .a1(p2avc), .q(p2a));

   assign p2an = (~p2a) & rst_n;

   pipen #(.DW(SN))

   L2R (

        .d_in    ( p2d     ),

        .d_in_a  ( p2ad    ),

        .d_out   ( p3d     ),

        .d_out_a ( p3an    )

        );

   pipen #(.DW(VCN))

   L2V (

        .d_in    ( p2vc    ),

        .d_in_a  ( p2avc   ),

        .d_out   ( p3vc    ),

        .d_out_a ( p3an    )

        );

   // p3 -> DEMUX -> pd[0]

   ddmux #(.DW(SN), .VCN(VCN))

   RTDM (

         .d_in_a  ( p3a   ),

         .d_out   ( pd[0] ),

         .d_in    ( p3d   ),

         .d_sel   ( p3vc  ),

         .d_out_a ( pda[0])

         );

   //c2 CP3A (.q(p3a), .a0(p3ad), .a1(|p3vc));

   assign p3an = (~p3a) & rst_n;

   // pd pipeline

   generate

      for(gbd=0; gbd<PD*2; gbd++) begin:RT

         for(gvc=0; gvc<VCN; gvc++) begin:V

            pipen #(.DW(SN))

            P (

               .d_in    ( pd[gbd][gvc]     ),

               .d_in_a  ( pda[gbd][gvc]    ),

               .d_out   ( pd[gbd+1][gvc]   ),

               .d_out_a ( pdan[gbd+1][gvc] )

               );

            assign pdan[gbd+1][gvc] = (~pda[gbd+1][gvc])&rst_n;

         end

      end // block: RT

   endgenerate

   // output

   generate

      for(gvc=0; gvc<VCN; gvc++) begin:OV

         assign dort[gvc] = pd[PD*2][gvc];

         assign pda[PD*2][gvc] = doa[gvc];

      end

   endgenerate

endmodule // rtu