yosys/techlibs/greenpak4/gp_dff.lib

library(gp_dff) {
  cell(GP_DFF) {
    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_DFFS) {
    area: 1;
    ff("IQ", "IQN") { clocked_on: CLK;
                  next_state: D;
                      preset: "nSET'"; }
    pin(CLK) { direction: input;
                 clock: true; }
    pin(D) { direction: input; }
    pin(Q) { direction: output;
              function: "IQ"; }
    pin(nSET) { direction: input; }
  }
  cell(GP_DFFR) {
    area: 1;
    ff("IQ", "IQN") { clocked_on: CLK;
                      next_state: D;
                           clear: "nRST'"; }
    pin(CLK) { direction: input;
                   clock: true; }
    pin(D) { direction: input; }
    pin(Q) { direction: output;
              function: "IQ"; }
    pin(nRST) { direction: input; }
  }
}