?? dffr_b.v
字號(hào):
// Positive edge-triggered D flip-flop, built out of nand gates`celldefinemodule dffr_b(clr_,clk,q,q_,d); output q, q_; input clr_, clk, d; nand n1 (de, dl, qe); nand n2 (qe, clk, de, clr_); nand n3 (dl, d, dl_, clr_); nand n4 (dl_, dl, clk, qe); nand n5 (q, qe, q_); nand n6 (q_, dl_, q, clr_);endmodule`endcelldefine
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