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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 CM allocator (the CM dispatcher in the thesis) *** SystemVerilog is used *** References For the detail structure, please refer to Section 6.3.1 of the thesis: Wei Song, Spatial parallelism in the routers of asynchronous on-chip networks, PhD thesis, the University of Manchester, 2011. History: 08/09/2009 Initial version. <wsong83@gmail.com> 20/09/2010 Modified for the Clos SDM router <wsong83@cs.man.ac.uk> 25/05/2011 Clean up for opensource. <wsong83@gmail.com> */ // the router structure definitions `include "define.v" module cm_alloc (/*AUTOARG*/ `ifndef ENABLE_CRRD s, `endif // Outputs sra, wra, nra, era, lra, scfg, ncfg, wcfg, ecfg, lcfg, // Inputs wr, er, sr, nr, lr ) ; //requests from all IMs input [1:0] wr, er; input [3:0] sr, nr, lr; // ack to IMs output sra, wra, nra, era, lra; // the configuration to the local CM output [1:0] scfg, ncfg; output [3:0] wcfg, ecfg, lcfg; // when using the asynchronous dispatching algorithm, status is sent back to IMs `ifndef ENABLE_CRRD output [4:0] s; `endif // arbiters mutex_arb #(2) SA ( .req ( {lr[0], nr[0]} ), .gnt ( scfg ) ); mutex_arb #(4) WA ( .req ( {lr[1], er[0], nr[1], sr[0]} ), .gnt ( wcfg ) ); mutex_arb #(2) NA ( .req ( {lr[2], sr[1]} ), .gnt ( ncfg ) ); mutex_arb #(4) EA ( .req ( {lr[3], nr[2], wr[0], sr[2]} ), .gnt ( ecfg ) ); mutex_arb #(4) LA ( .req ( {er[1], nr[3], wr[1], sr[3]} ), .gnt ( lcfg ) ); // generating the ack assign sra = |{wcfg[0], ncfg[0], ecfg[0], lcfg[0]}; assign wra = |{ecfg[1], lcfg[1]}; assign nra = |{scfg[0], wcfg[1], ecfg[2], lcfg[2]}; assign era = |{wcfg[2], lcfg[3]}; assign lra = |{scfg[1], wcfg[3], ncfg[1], ecfg[3]}; // generating the status `ifndef ENABLE_CRRD assign s = {|lcfg, |ecfg, |ncfg, |wcfg, |scfg}; `endif endmodule // cm_alloc
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