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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 Sub-channel controller References * Lookahead pipelines Montek Singh and Steven M. Nowick, The design of high-performance dynamic asynchronous pipelines: lookahead style, IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 2007(15), 1256-1269. doi:10.1109/TVLSI.2007.902205 * Channel slicing Wei Song and Doug Edwards, A low latency wormhole router for asynchronous on-chip networks, Asia and South Pacific Design Automation Conference, 2010, 437-443. For the detail structure, please refer to Section 7.1.1 of the thesis: Wei Song, Spatial parallelism in the routers of asynchronous on-chip networks, PhD thesis, the University of Manchester, 2011. History: 05/05/2009 Initial version. <wsong83@gmail.com> 22/10/2010 Make it more timing robust. <wsong83@gmail.com> 24/05/2011 Clean up for opensource. <wsong83@gmail.com> */ // the router structure definitions `include "define.v" module subc_ctl (/*AUTOARG*/ // Outputs nack, rt_rst, // Inputs ai2cb, ack, eof, rt_ra, rt_err, rst_n ); input ai2cb; // the ack from output ports input ack; // the ack from the last stage of the input buffer input eof; // the eof bit from the last stage of the input buffer input rt_ra; // ack from the switch allocator input rt_err; // invalid router decision input rst_n; // the global active low reset signal output nack; // the ack to the last stage of the input buffer output rt_rst; // the router reset signal wire csc; // internal wires to handle the CSC of the STG wire acko; // the ack signal after the C2N gate wire fend; // the end of frame indicator wire acken; // active low ack enable `ifdef ENABLE_LOOKAHEAD c2n CD (.q(acko), .a0(ai2cb), .a1(ack)); // the C2N gate to avoid early withdrawal `else assign acko = ai2cb; `endif c2p CEN (.a1(eof), .a0(acko), .q(fend)); c2 C (.a0(rt_ra), .a1(fend), .q(csc)); nand U1 ( acken, rt_ra, ~csc); nor U2 ( rt_rst, fend, ~csc); nor AG ( nack, acko&(~eof), acken|(rt_err&ack), ~rst_n); endmodule // subc_ctl
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