// test comment
/* test comment */
library(demo) {
  type (bus4) {
    base_type : array;
    data_type : bit;
    bit_width : 4;
    bit_from : 0;
    bit_to : 3;
  }
  cell(BUF) {
    area: 2;
    pin(A) { direction: input; }
    pin(Y) { direction: output;
              function: "A"; }
  }
  cell(NOT) {
    area: 2;
    pin(A) { direction: input; }
    pin(Y) { direction: output;
              function: "A'"; }
  }
  cell(XOR) {
    area: 100;
    pin(A) { direction: input; }
    pin(B) { direction: input; }
    pin(Y) { direction: output;
             function: "(A^B)"; }
  }
  // not used, see -g option of abc http://www.clifford.at/yosys/cmd_abc.html
  cell(XORDUAL) {
    area: 2;
    pin(A) { direction: input; }
    pin(B) { direction: input; }
    pin(C) { direction: input; }
    pin(D) { direction: input; }
    pin(Y) { direction: output;
             function: "(A^B)"; }
    pin(Z) { direction: output;
             function: "(C^D)"; }
  }
  cell(XOR2) {
    area: 2;
    bus(I1) {
      bus_type : bus4;
      direction : input;
    }
    bus(I2) {
      bus_type : bus4;
      direction : input;
    }
    bus(Y) {
      bus_type : bus4;
      direction : output;
      pin (Y[0:3]) {
        function: "(I1^I2)";
      }
    }
  }
  cell(NAND) {
    area: 2;
    pin(A) { direction: input; }
    pin(B) { direction: input; }
    pin(Y) { direction: output;
             function: "(A*B)'"; }
  }
  cell(NOR) {
    area: 2;
    pin(A) { direction: input; }
    pin(B) { direction: input; }
    pin(Y) { direction: output;
             function: "(A+B)'"; }
  }
  cell(DFF) {
    area: 2;
    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"; }
  }
  cell(DFFSR) {
    area: 2;
    ff("IQ", "IQN") { clocked_on: C;
                  next_state: D;
                      preset: S;
                       clear: R; }
    pin(C) { direction: input;
                 clock: true; }
    pin(D) { direction: input; }
    pin(Q) { direction: output;
              function: "IQ"; }
    pin(S) { direction: input; }
    pin(R) { direction: input; }
    ; // empty statement
  }
}