library(gates) {
  cell(NOT) {
    area: 2; // 7404 hex inverter
    pin(A) { direction: input; }
    pin(Y) { direction: output;
              function: "A'"; }
  }
  cell(BUF) {
    area: 4; // 2x 7404 hex inverter
    pin(A) { direction: input; }
    pin(Y) { direction: output;
              function: "A"; }
  }
  cell(NAND) {
    area: 3; // 7400 quad 2-input NAND gate
    pin(A) { direction: input; }
    pin(B) { direction: input; }
    pin(Y) { direction: output;
             function: "(A*B)'"; }
  }
  cell(NOR) {
    area: 3; // 7402 quad 2-input NOR gate
    pin(A) { direction: input; }
    pin(B) { direction: input; }
    pin(Y) { direction: output;
             function: "(A+B)'"; }
  }
  cell(DFF) {
    area: 6; // 7474 dual D positive edge triggered flip-flop
    ff(IQ, IQN) { clocked_on: C;
                  next_state: D; }
    pin(C) { direction: input;
                 clock: true; }
    pin(D) { direction: input; }
    pin(Q) { direction: output;
              function: "IQ"; }
  }
}