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https://opencores.org/ocsvn/async_sdm_noc/async_sdm_noc/trunk
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wire acko; // the ack signal after the C2N gate
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wire acko; // the ack signal after the C2N gate
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wire fend; // the end of frame indicator
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wire fend; // the end of frame indicator
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wire acken; // active low ack enable
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wire acken; // active low ack enable
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`ifdef ENABLE_LOOKAHEAD
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`ifdef ENABLE_LOOKAHEAD
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c2n CD (.q(acko), .a0(ai2cb), .a1(ack)); // the C2N gate to avoid early withdrawal
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c2n CD (.q(acko), .a(ai2cb), .b(ack)); // the C2N gate to avoid early withdrawal
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`else
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`else
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assign acko = ai2cb;
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assign acko = ai2cb;
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`endif
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`endif
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c2p CEN (.a1(eof), .a0(acko), .q(fend));
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c2p CEN (.b(eof), .a(acko), .q(fend));
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c2 C (.a0(rt_ra), .a1(fend), .q(csc));
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c2 C (.a0(rt_ra), .a1(fend), .q(csc));
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nand U1 ( acken, rt_ra, ~csc);
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nand U1 ( acken, rt_ra, ~csc);
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nor U2 ( rt_rst, fend, ~csc);
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nor U2 ( rt_rst, fend, ~csc);
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nor AG ( nack, acko&(~eof), acken|(rt_err&ack), ~rst_n);
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nor AG ( nack, acko&(~eof), acken|(rt_err&ack), ~rst_n);
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