yosys/tests/various/aiger_dff.ys

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read_verilog -icells <<EOT
module top(input clk, d, output q);
\$_DFF_N_ dffn(.C(clk), .D(d), .Q(q));
endmodule
EOT
write_aiger -zinit -ywmap aiger_dff.out /dev/null
!grep -qF negedge aiger_dff.out