yosys/manual/APPNOTE_011_Design_Investig.../sumprod_01.dot

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digraph "sumprod" {
rankdir="LR";
remincross=true;
n2 [ shape=octagon, label="a", color="black", fontcolor="black" ];
n3 [ shape=octagon, label="b", color="black", fontcolor="black" ];
n4 [ shape=octagon, label="c", color="black", fontcolor="black" ];
n5 [ shape=octagon, label="sum", color="black", fontcolor="black" ];
c9 [ shape=record, label="{{<p6> A|<p7> B}|$1\n$add|{<p8> Y}}" ];
c10 [ shape=record, label="{{<p6> A|<p7> B}|$2\n$add|{<p8> Y}}" ];
c9:p8:e -> c10:p6:w [color="black", style="setlinewidth(3)", label=""];
n2:e -> c9:p6:w [color="black", style="setlinewidth(3)", label=""];
n3:e -> c9:p7:w [color="black", style="setlinewidth(3)", label=""];
n4:e -> c10:p7:w [color="black", style="setlinewidth(3)", label=""];
c10:p8:e -> n5:w [color="black", style="setlinewidth(3)", label=""];
}