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

 The full dual-rail pipeline stage for the credit fifo in VC routers.

 It has a reset pin to feed a token into every cpipe stage.

 History:

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

 01/06/2011  Clean up for opensource. <wsong83@gmail.com>

*/

module cpipe (/*AUTOARG*/

   // Outputs

   cia, co,

   // Inputs

   rst, ci, coa

   );

   input rst;                   // active high reset

   input ci;                    // credit input

   output cia;                  // credit input ack

   output co;                   // credit output

   input  coa;                  // credit output ack

   wire   c0, c1;               // internal wires

   dc2 C0 ( .d(ci), .a(~c1), .q(c0));

   dc2 C1 ( .d(c0|rst), .a((~coa)|rst), .q(c1));

   assign co = (~rst)&c1;

   assign cia = c0;

endmodule // cpipe