0: sendto bitfifo.inEnqueue;
bitfifo.inEnqueue: [*] take, deliver;
bitfifo.outDequeue: [*] wait, take, sendto lut3.in2;
-lut3.in2: [5] notify bitfifo.outDequeue;
+lut3.in2: [4] notify bitfifo.outDequeue;
[74] take, deliver, notify bitfifo.outDequeue;
// mux on second input