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1 40 wsong0210
/*
2
 Asynchronous SDM NoC
3
 (C)2011 Wei Song
4
 Advanced Processor Technologies Group
5
 Computer Science, the Univ. of Manchester, UK
6
 
7
 Authors:
8
 Wei Song     wsong83@gmail.com
9
 
10
 License: LGPL 3.0 or later
11
 
12
 The input buffer for VC routers.
13
 
14
 History:
15
 01/04/2010  Initial version. <wsong83@gmail.com>
16
 12/05/2010  Use MPxP crossbars. <wsong83@gmail.com>
17
 17/04/2010  Remove unnecessary pipeline stages. <wsong83@gmail.com>
18
 02/06/2011  Clean up for opensource. <wsong83@gmail.com>
19 51 wsong0210
 09/06/2011  Remove the C-elements as muxes already have C-elements inside. <wsong83@gmail.com>
20 40 wsong0210
 
21
*/
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23
module inpbuf (/*AUTOARG*/
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   // Outputs
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   dia, cor, do0, do1, do2, do3, dot, dortg, vcr, swr,
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   // Inputs
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   di0, di1, di2, di3, dit, divc, coa, doa, vcra, swrt, addrx, addry,
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   rst_n
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   );
30
 
31
   parameter DW = 32;           // data width
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   parameter VCN = 2;           // VC number
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   parameter DIR = 0;           // 0-4 south, west, north, east, local
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   parameter SN = 2;            // maximal output port number
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   parameter PD = 3;            // the depth of the input buffer pipeline
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   parameter SCN = DW/2;        // number of 1-of-4 sub-channels
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   parameter FT = 3;            // flit type, now 3, HOF, BOF, EOF
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   // data IP
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   input [SCN-1:0] di0, di1, di2, di3;
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   input [FT-1:0]  dit;
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   input [VCN-1:0] divc;
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   output          dia;
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45
   // credit flow-control
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   output [VCN-1:0] cor;
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   input [VCN-1:0]  coa;
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49
   // data to crossbar
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   output [VCN-1:0][SCN-1:0] do0,do1,do2,do3;
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   output [VCN-1:0][FT-1:0]  dot;
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   output [VCN-1:0][SN-1:0]  dortg;
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   input  [VCN-1:0]          doa;
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55
   // request to VC allocator
56
   output [VCN-1:0][SN-1:0] vcr;
57
   input [VCN-1:0]           vcra;
58
 
59
   // output to SW allocator
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   output [VCN-1:0][1:0]    swr;
61
 
62
   // routing guide for SW DEMUX
63
   input [VCN-1:0][SN-1:0]  swrt;
64
 
65
   // local addresses
66
   input [7:0]               addrx, addry;
67
 
68 45 wsong0210
   input                    rst_n;
69 40 wsong0210
 
70
   //-----------------------------                  
71
   // VC_MUX
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   wire                     ivma, rua;
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   wire [SCN-1:0]            di0m, di1m, di2m, di3m;
74
   wire [FT-1:0]             ditm;
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   wire [VCN-1:0]            divcm;
76
   wire [VCN-1:0]            muxa;
77
 
78
   // VC_BUF
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   wire [2*PD:0][VCN-1:0][SCN-1:0] vcd0, vcd1, vcd2, vcd3; // VC data
80
   wire [2*PD:0][VCN-1:0][FT-1:0]  vcdt;              // VC flit type
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   wire [2*PD:0][VCN-1:0][SCN-1:0] vcdad, vcdadn;          // VC ack
82
   wire [2*PD:0][VCN-1:0]            vcdat, vcdatn;          // VC data ack and type ack
83
   wire [1:0][VCN-1:0]               vcda;                   // the comman ack               
84
 
85
   // control path
86
   wire [2*PD:2*PD-2][VCN-1:0][1:0] vcft;            // flit type on control path
87
   wire [2*PD:2*PD-2][VCN-1:0]      vcfta, vcftan;          // flit type ack, on control path
88
   wire [VCN-1:0]                   vcdam;                  // need an extra ack internal signal
89
   wire [VCN-1:0][SN-1:0]            rtg;                    // routing direction guide
90
   wire [VCN-1:0]                   doan;
91
 
92
   // last stage of input buffer
93
   wire [VCN-1:0]                   vcor;
94
   wire [VCN-1:0]                   vcog;
95
   wire [VCN-1:0]                   swa;
96
 
97
   genvar                          gbd, gvc, gsub, i;
98
 
99
   //---------------------------------------------
100
   // the input VCDMUX
101
   vcdmux #(.VCN(VCN), .DW(DW))
102
   IVM (
103
         .dia   ( ivma     ),
104
         .do0   ( vcd0[0]  ),
105
         .do1   ( vcd1[0]  ),
106
         .do2   ( vcd2[0]  ),
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         .do3   ( vcd3[0]  ),
108
         .dot   ( vcdt[0]  ),
109
         .di0   ( di0m     ),
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         .di1   ( di1m     ),
111
         .di2   ( di2m     ),
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         .di3   ( di3m     ),
113
         .dit   ( ditm     ),
114
         .divc  ( divcm    ),
115
         .doa   ( muxa     )
116
         );
117
 
118
   //c2 IVMA (.a0(ivma), .a1(rua), .q(dia)); divc is not checked
119 51 wsong0210
   ctree #(.DW(2)) ACKT(.ci({ivma, rua}), .co(dia));
120 40 wsong0210
 
121 45 wsong0210
   assign di0m = rst_n ? di0 : 0;
122
   assign di1m = rst_n ? di1 : 0;
123
   assign di2m = rst_n ? di2 : 0;
124
   assign di3m = rst_n ? di3 : 0;
125
   assign ditm = rst_n ? dit : 0;
126
   assign divcm = rst_n ? divc : 0;
127 40 wsong0210
 
128
   //---------------------------------------------
129
   // the VC buffers
130
   generate
131
      for(gbd=0; gbd<PD*2-2; gbd++) begin:BFN
132
         for(gvc=0; gvc<VCN; gvc++) begin:V
133
            for(gsub=0; gsub<SCN; gsub++) begin:SC
134
               pipe4 #(.DW(2))
135
               DP (
136 42 wsong0210
                   .ia ( vcdad[gbd][gvc][gsub]  ),
137
                   .o0 ( vcd0[gbd+1][gvc][gsub] ),
138
                   .o1 ( vcd1[gbd+1][gvc][gsub] ),
139
                   .o2 ( vcd2[gbd+1][gvc][gsub] ),
140
                   .o3 ( vcd3[gbd+1][gvc][gsub] ),
141
                   .i0 ( vcd0[gbd][gvc][gsub]   ),
142
                   .i1 ( vcd1[gbd][gvc][gsub]   ),
143
                   .i2 ( vcd2[gbd][gvc][gsub]   ),
144
                   .i3 ( vcd3[gbd][gvc][gsub]   ),
145
                   .oa ( vcdadn[gbd+1][gvc][gsub] )
146 40 wsong0210
                   );
147 45 wsong0210
               assign vcdadn[gbd+1][gvc][gsub] = (~vcdad[gbd+1][gvc][gsub])&rst_n;
148 40 wsong0210
            end // block: SC
149
 
150
            pipen #(.DW(FT))
151
            TP (
152
                .d_in    ( vcdt[gbd][gvc]     ),
153
                .d_in_a  ( vcdat[gbd][gvc]    ),
154
                .d_out   ( vcdt[gbd+1][gvc]   ),
155
                .d_out_a ( vcdatn[gbd+1][gvc]  )
156
                );
157 45 wsong0210
            assign vcdatn[gbd+1][gvc] = (~vcdat[gbd+1][gvc])&rst_n;
158 40 wsong0210
 
159
         end // block: V
160
      end // block: BFN
161
 
162
      for(gvc=0; gvc<VCN; gvc++) begin:BFNV
163
         if(PD>1) begin:ACKG
164
            ctree #(.DW(SCN+1)) ACKT(.ci({vcdat[0],vcdad[0]}), .co(muxa[gvc]));
165
            assign vcdad[PD*2-2][gvc] = {SCN{vcda[0][gvc]}};
166
            assign vcdat[PD*2-2] = vcda[0][gvc];
167
         end else begin
168
            assign muxa[gvc] = vcda[0][gvc];
169
         end
170
      end // block: V
171
 
172
   endgenerate
173
 
174
   // the last two stages of VC buffers, separate flit type and data
175
   generate
176
      for(gbd=PD*2-2; gbd<PD*2; gbd++) begin:BFL2
177
         for(gvc=0; gvc<VCN; gvc++) begin:V
178
            for(gsub=0; gsub<SCN; gsub++) begin:SC
179
               pipe4 #(.DW(2))
180
               DP (
181 42 wsong0210
                   .ia ( vcdad[gbd][gvc][gsub]    ),
182
                   .o0 ( vcd0[gbd+1][gvc][gsub]   ),
183
                   .o1 ( vcd1[gbd+1][gvc][gsub]   ),
184
                   .o2 ( vcd2[gbd+1][gvc][gsub]   ),
185
                   .o3 ( vcd3[gbd+1][gvc][gsub]   ),
186
                   .i0 ( vcd0[gbd][gvc][gsub]     ),
187
                   .i1 ( vcd1[gbd][gvc][gsub]     ),
188
                   .i2 ( vcd2[gbd][gvc][gsub]     ),
189
                   .i3 ( vcd3[gbd][gvc][gsub]     ),
190
                   .oa ( vcdadn[gbd+1][gvc][gsub] )
191 40 wsong0210
                   );
192 45 wsong0210
               assign vcdadn[gbd+1][gvc][gsub] = (~vcdad[gbd+1][gvc][gsub])&rst_n;
193 40 wsong0210
            end // block: SC
194
 
195
            pipen #(.DW(FT))
196
            TP (
197
                .d_in    ( vcdt[gbd][gvc]     ),
198
                .d_in_a  ( vcdat[gbd][gvc]    ),
199
                .d_out   ( vcdt[gbd+1][gvc]   ),
200
                .d_out_a ( vcdatn[gbd+1][gvc]  )
201
                );
202
 
203 45 wsong0210
            assign vcdatn[gbd+1][gvc] = (~vcdat[gbd+1][gvc])&rst_n;
204 40 wsong0210
 
205
            pipen #(.DW(2))
206
            CTP (
207
                .d_in    ( vcft[gbd][gvc]     ),
208
                .d_in_a  ( vcfta[gbd][gvc]    ),
209
                .d_out   ( vcft[gbd+1][gvc]   ),
210
                .d_out_a ( vcftan[gbd+1][gvc] )
211
                );
212
 
213 45 wsong0210
            assign vcftan[gbd+1][gvc] = (~vcfta[gbd+1][gvc])&rst_n;
214 40 wsong0210
         end // block: V
215
      end // block: BFL2
216
 
217
      for(gvc=0; gvc<VCN; gvc++) begin:BFL2V
218
         ctree #(.DW(SCN+2)) ACKT(.ci({vcfta[PD*2-2][gvc], vcdat[PD*2-2][gvc], vcdad[PD*2-2][gvc]}), .co(vcda[0][gvc]));
219
         assign vcdat[PD*2][gvc] = vcda[1][gvc];
220
         assign vcdad[PD*2][gvc] = {SCN{vcda[1][gvc]}};
221
         assign vcfta[PD*2][gvc] = swa[gvc];
222
         assign vcft[PD*2-2][gvc] = {vcdt[PD*2-2][gvc][FT-1], |vcdt[PD*2-2][gvc][FT-2:0]};
223
         assign swr[gvc] = vcft[PD*2][gvc];
224
      end
225
 
226
   endgenerate
227
 
228
 
229
   // the routing guide pipeline stage
230
   generate
231
      for(gvc=0; gvc<VCN; gvc++) begin:R
232
         pipen #(.DW(SN))
233
         RP (
234
             .d_in     ( swrt[gvc]          ),
235
             .d_in_a   ( swa[gvc]           ),
236
             .d_out    ( rtg[gvc]           ),
237 45 wsong0210
             .d_out_a  ( (~vcda[1][gvc])&rst_n   )
238 40 wsong0210
             );
239
      end
240
   endgenerate
241
 
242
   generate
243
      for(gvc=0; gvc<VCN; gvc++) begin:LPS
244
 
245
         // credit control
246 45 wsong0210
         dc2 FCP (.q(cor[gvc]), .d(|rtg[gvc]), .a((~coa[gvc])&rst_n));
247 40 wsong0210
 
248
         // output name conversation
249
         assign do0[gvc] = vcd0[PD*2][gvc];
250
         assign do1[gvc] = vcd1[PD*2][gvc];
251
         assign do2[gvc] = vcd2[PD*2][gvc];
252
         assign do3[gvc] = vcd3[PD*2][gvc];
253
 
254
         assign dot[gvc] = vcdt[PD*2][gvc];
255
         assign dortg[gvc] = rtg[gvc];
256
 
257
         c2 AC (.q(vcda[1][gvc]), .a0(cor[gvc]), .a1(doa[gvc]));
258
 
259
      end // block: LPS
260
   endgenerate
261
 
262
   // routing unit
263 46 wsong0210
   rtu #(.VCN(VCN), .DIR(DIR), .SN(SN), .PD(PD))
264 40 wsong0210
   RTC (
265
        .dia   ( rua       ),
266
        .dort  ( vcr       ),
267 45 wsong0210
        .rst_n ( rst_n     ),
268 40 wsong0210
        .di0   ( di0m[3:0] ),
269
        .di1   ( di1m[3:0] ),
270
        .di2   ( di2m[3:0] ),
271
        .di3   ( di3m[3:0] ),
272
        .dit   ( ditm      ),
273
        .divc  ( divcm     ),
274
        .addrx ( addrx     ),
275
        .addry ( addry     ),
276
        .doa   ( vcra      )
277
   );
278
 
279
endmodule // inpbuf
280
 
281
 
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