def pullUpAfter(sig, initDelay=<NUM_LIT:6> * Time.ns):
def _pullDownAfter(s):<EOL><INDENT>s.write(False, sig)<EOL>yield s.wait(initDelay)<EOL>s.write(True, sig)<EOL><DEDENT>return _pullDownAfter<EOL>
:return: Simulation driver which keeps signal value low for initDelay then
    it sets value to 1