yosys/tests/techmap/dlatchlibmap_dlatchn.lib

library(test) {
  cell (dlatchn) {
    area : 6;
    latch("IQ", "IQN") {
      data_in : "D";
      enable : "!ENA";
    } 
    pin(D) {
      direction : input;
    }
    pin(ENA) {
      direction : input;
    }
    pin(Q) {
      direction: output;
      function : "IQ";
    }
    pin(QN) {
      direction: output;
      function : "IQN";
    } 
  }
}