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History:
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History:
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05/05/2009 Initial version. <wsong83@gmail.com>
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05/05/2009 Initial version. <wsong83@gmail.com>
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17/04/2011 Replace the common ack generation. <wsong83@gmail.com>
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17/04/2011 Replace the common ack generation. <wsong83@gmail.com>
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26/05/2011 Clean up for opensource. <wsong83@gmail.com>
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26/05/2011 Clean up for opensource. <wsong83@gmail.com>
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21/06/2011 Remove the eof as it makes confusion. <wsong83@gmail.com>
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*/
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*/
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// the router structure definitions
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`include "define.v"
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module pipe4(/*AUTOARG*/
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module pipe4(/*AUTOARG*/
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// Outputs
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// Outputs
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ia, o0, o1, o2, o3,
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ia, o0, o1, o2, o3,
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// Inputs
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// Inputs
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i0, i1, i2, i3, oa
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i0, i1, i2, i3, oa
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`ifdef ENABLE_EOF
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, i4, o4
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`endif
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);
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);
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parameter DW = 32; // the data width of the pipeline stage
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parameter DW = 32; // the data width of the pipeline stage
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parameter SCN = DW/2; // the number of 1-of-4 sub-stage required
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parameter SCN = DW/2; // the number of 1-of-4 sub-stage required
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input [SCN-1:0] i0, i1, i2, i3;
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input [SCN-1:0] i0, i1, i2, i3;
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output [SCN-1:0] o0, o1, o2, o3;
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output [SCN-1:0] o0, o1, o2, o3;
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input oa; // input ack
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input oa; // input ack
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output ia; // output ack
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output ia; // output ack
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`ifdef ENABLE_EOF
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output o4; // the eof bit
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input i4;
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`endif
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// internal signals
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// internal signals
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wire [SCN-1:0] tack;
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wire [SCN-1:0] tack;
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// generate the ack line
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// generate the ack line
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genvar i;
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genvar i;
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dc2 DC1 (.d(i1[i]), .a(oa), .q(o1[i]));
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dc2 DC1 (.d(i1[i]), .a(oa), .q(o1[i]));
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dc2 DC2 (.d(i2[i]), .a(oa), .q(o2[i]));
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dc2 DC2 (.d(i2[i]), .a(oa), .q(o2[i]));
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dc2 DC3 (.d(i3[i]), .a(oa), .q(o3[i]));
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dc2 DC3 (.d(i3[i]), .a(oa), .q(o3[i]));
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end endgenerate
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end endgenerate
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// the eof bit
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`ifdef ENABLE_EOF
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dc2 DD_DC4 (.d(i4), .a(oa), .q(o4));
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`endif
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// generate the input ack
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// generate the input ack
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assign tack = o0|o1|o2|o3;
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assign tack = o0|o1|o2|o3;
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ctree #(.DW(SCN)) ACKT (.ci(tack), .co(ia));
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ctree #(.DW(SCN)) ACKT (.ci(tack), .co(ia));
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endmodule // pipe4
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endmodule // pipe4
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