Subversion Repositories async_sdm_noc

/*

 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

 Flow control unit.

 History:

 31/03/2010  Initial version. <wsong83@gmail.com>

 12/05/2010  Use MPxP crossbar. <wsong83@gmail.com>

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

*/

module fcctl ( /*AUTOARG*/

   // Outputs

   afc, ro,

   // Inputs

   credit, ri, rst

   );

   parameter VCN = 2;           // number of VCs per direction

   parameter PD = 3;            // depth of an input VC buffer

   input [VCN-1:0]  credit;      // credit input from the next router

   output [VCN-1:0] afc; // ack for the credit input

   input [VCN-1:0]  ri;          // VC request from VCA

   output [VCN-1:0] ro;          // credit grant output

   input            rst;        // active high reset

   wire [PD:0][VCN-1:0] cp, cpa;

   genvar                 i,j;

   // the credit pipeline

   generate

      for(i=0; i<PD; i++) begin: P

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

            cpipe CP (.cia(cpa[i][j]), .co(cp[i+1][j]), .rst(rst), .ci(cp[i][j]), .coa(cpa[i+1][j]));

         end

      end

   endgenerate

   // grant a credit to a VC request

   generate

      for(i=0; i<VCN; i++) begin:R

         dc2 CR (.a(ri[i]), .d(cp[PD][i]), .q(cpa[PD][i]));

      end

   endgenerate

   assign ro = cpa[PD];

   assign cp[0] = credit;

   assign afc = cpa[0];

endmodule // fcctl