Calling this circuit a kludge comes from a general negative attitude toward asynchronous circuits such as this. While such circuits are often more difficult to analyze and debug, sometimes they really are the way to go. Much early digital circuitry depended heavily on these kinds of 'tricks', but with more advanced design techniques and cheaper transistors they become more or less deprecated. This application looks to me like a good case for using such circuits. Bob Ammerman RAm Systems ----- Original Message ----- From: "Mike Singer" To: Sent: Sunday, April 20, 2003 3:54 PM Subject: Re: [EE]: Pulse circuit, can you explain how this works. > > Olin wrote: > > > This type of circuit is somewhat of a kludge. Wanting > > > an edge to glitch converter is usually a symptom of bad > > > design elsewhere. > > > James Williams wrote: > > The state of these two signals as a minimun Tw of 0.5us. > > The pic processor can not handle this time requirement. > > Even when polling. So I need a circuit that can do the > > job faster. > > Unless there is a better way of doing this. > > How about counting 40MHz signal through time-gates formed > by these two signals? You can quickly store counter's values > to PIC RAM and analyze them late. > > Mike. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body