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Example H/W Protocol: 4/P Handshake

A commonly-used, asynchronous, simplex protocol, with flow control. 

  putbyte(char d)
  {
    wait_until(!ack);
    data = d;
    settle();
    req = 1;
    wait_until(ack);
    req = 0;
  }

  char getbyte()
  {
    wait_until(req);
    char r = data;
    ack = 1;
    wait_until(!req);
    ack = 0;
    return r;
  }

Example, untimed, blocking transactor: converts from transaction to pin-level modelling.

See working SystemC versions in the 'Toy ESL' practical material.

(C) 2008-10, DJ Greaves, University of Cambridge, Computer Laboratory.