yosys/techlibs/greenpak4/gp_dff.lib

library(gp_dff) {
  cell(GP_DFF_NOSR) {
    area: 1;
    ff("IQ", "IQN") { clocked_on: CLK;
                  next_state: D; }
    pin(CLK) { direction: input;
                 clock: true; }
    pin(D) { direction: input; }
    pin(Q) { direction: output;
              function: "IQ"; }
  }
  cell(GP_DFF_SR) {
    area: 1;
    ff("IQ", "IQN") { clocked_on: CLK;
                  next_state: D;
                      preset: "nSETZ'";
                       clear: "nRSTZ'"; }
    pin(CLK) { direction: input;
                 clock: true; }
    pin(D) { direction: input; }
    pin(Q) { direction: output;
              function: "IQ"; }
    pin(nRSTZ) { direction: input; }
    pin(nSETZ) { direction: input; }
  }
}