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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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20/09/2010 Supporting channel slicing and SDM using macro difinitions. <wsong83@gmail.com>
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20/09/2010 Supporting channel slicing and SDM using macro difinitions. <wsong83@gmail.com>
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24/05/2011 Clean up for opensource. <wsong83@gmail.com>
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24/05/2011 Clean up for opensource. <wsong83@gmail.com>
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01/06/2011 Use the comp4 common comparator rather than the chain_comparator defined in this module. <wsong83@gmail.com>
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*/
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*/
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// the router structure definitions
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// the router structure definitions
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`include "define.v"
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`include "define.v"
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output [5:0] decision;
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output [5:0] decision;
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wire [2:0] x_cmp [1:0];
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wire [2:0] x_cmp [1:0];
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wire [2:0] y_cmp [1:0];
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wire [2:0] y_cmp [1:0];
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chain_comparator X0 ( .a(pipe_xd[3:0]), .b(addrx[3:0]), .q(x_cmp[0]));
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comp4 X0 ( .a(pipe_xd[3:0]), .b(addrx[3:0]), .q(x_cmp[0]));
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chain_comparator X1 ( .a(pipe_xd[7:4]), .b(addrx[7:4]), .q(x_cmp[1]));
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comp4 X1 ( .a(pipe_xd[7:4]), .b(addrx[7:4]), .q(x_cmp[1]));
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chain_comparator Y0 ( .a(pipe_yd[3:0]), .b(addry[3:0]), .q(y_cmp[0]));
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comp4 Y0 ( .a(pipe_yd[3:0]), .b(addry[3:0]), .q(y_cmp[0]));
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chain_comparator Y1 ( .a(pipe_yd[7:4]), .b(addry[7:4]), .q(y_cmp[1]));
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comp4 Y1 ( .a(pipe_yd[7:4]), .b(addry[7:4]), .q(y_cmp[1]));
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assign decision[0] = x_cmp[1][0] | (x_cmp[1][2]&x_cmp[0][0]); // frame x > addr x
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assign decision[0] = x_cmp[1][0] | (x_cmp[1][2]&x_cmp[0][0]); // frame x > addr x
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assign decision[1] = x_cmp[1][1] | (x_cmp[1][2]&x_cmp[0][1]); // frame x < addr x
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assign decision[1] = x_cmp[1][1] | (x_cmp[1][2]&x_cmp[0][1]); // frame x < addr x
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assign decision[2] = x_cmp[1][2] & x_cmp[0][2]; // frame x = addr x
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assign decision[2] = x_cmp[1][2] & x_cmp[0][2]; // frame x = addr x
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assign decision[3] = y_cmp[1][0] | (y_cmp[1][2]&y_cmp[0][0]); // frame y > addr y
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assign decision[3] = y_cmp[1][0] | (y_cmp[1][2]&y_cmp[0][0]); // frame y > addr y
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assign decision[4] = y_cmp[1][1] | (y_cmp[1][2]&y_cmp[0][1]); // frame y < addr y
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assign decision[4] = y_cmp[1][1] | (y_cmp[1][2]&y_cmp[0][1]); // frame y < addr y
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assign decision[5] = y_cmp[1][2] & y_cmp[0][2]; // frame y = addr y
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assign decision[5] = y_cmp[1][2] & y_cmp[0][2]; // frame y = addr y
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endmodule // routing_decision
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endmodule // routing_decision
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// the 1-of-4 comparator
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module chain_comparator (
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a
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,b
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,q
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);
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input [3:0] a;
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input [3:0] b;
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output [2:0] q;
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// a > b
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assign q[0] = (a[3]&(|b[2:0])) | (a[2]&(|b[1:0])) | (a[1]&(|b[0:0]));
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// a < b
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assign q[1] = (a[2]&(|b[3:3])) | (a[1]&(|b[3:2])) | (a[0]&(|b[3:1]));
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// a = b
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assign q[2] = (a[3]&b[3]) | (a[2]&b[2]) | (a[1]&b[1]) | (a[0]&b[0]);
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endmodule // chain_comparator
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