yosys/tests/techmap/dfflibmap_dff_not_next.lib

library (test_not_next) {
  cell (dff_not_next) {
    area: 1.0;
    pin (QN) {
      direction : output;
      function : "STATE";
    }
    pin (CLK) {
      direction : input;
      clock : true;
    }
    pin (D) {
      direction : input;
    }
    pin (RN) {
      direction : input;
    }
    ff (STATE, STATEN) {
      clocked_on: "CLK";
      next_state: "!D";
      preset : "!RN";
    }
  }
}