Unfortuneately not. I've got the trial version of HyperLynx here, but it doesn't allow the simulation of custom made setups. I've had a couple of setups simulated by a contact in the industry that has access to the full version, this is what put me onto needing the termination. However, it isn't all that useful in a bidirectional design. Or at least I wasn't too sure how to use it in such a manner.
Thanks I'll check out that site. ----- Original Message ----- From: "John Haddy" <[EMAIL PROTECTED]> To: "Protel EDA Forum" <[EMAIL PROTECTED]> Sent: Friday, September 27, 2002 6:48 PM Subject: Re: [PEDA] OT: termination for a multidrop bidirectional bus > Bevan, > > I'd check out Howard Johnson's site at www.sigcon.com and look at his > archives of topics. There are interesting notes such as: > > When to use AC Coupling > Three Drop Bus > Hairball Nets > Both-ends Termination > Bus Architecture and Timing > AC Terminators > Bidirectional Terminations > ...etc. > > Dr Johnson's archive should be able to provide most of the answers you're > looking for. I assume that you don't have access to HyperLynx or similar > simulation tools? > > John Haddy > > > > > -----Original Message----- > > From: Bevan Weiss [mailto:[EMAIL PROTECTED]] > > Sent: Friday, 27 September 2002 4:07 PM > > To: Protel EDA Forum > > Subject: Re: [PEDA] OT: termination for a multidrop bidirectional bus > > > > > > The speeds are ~30MHz, the length of the bus is hopefully to be less than > > 12" > > > > The goals are speed, size and cost (high speed, small size, low cost). > > However the speed is pretty much set (30MHz) and the cost is the next > > biggest concern. > > The brands of bus devices used are: > > Epson (S1D13506 LCD controller) > > Motorola MCF5307 microprocessor > > Micron SDRAM > > Fujitsu FLASH memory > > SMSC Ethernet Controller > > Analog Devices AS21065L > > none of these have inbuilt termination resistors, or any form of drive > > control that I know of (please advise me if I'm wrong on this). > > > > The 32bits is pretty much required to maintain bus throughput. A > > serial bus > > isn't an option. > > > > I'm leaning towards the AC termination method, as that consumes the lowest > > power. However I'm not too sure whether the rise/fall times > > would be quick > > enough using such a termination method. Any words of wisdom etc would be > > greatly appreciated, I can't seem to get much info from my > > tutors, it would > > seem it's slightly above most of them :( > > > > Thanks guys, > > Bevan Weiss > > > > > > ----- Original Message ----- > > From: "Tony Karavidas" <[EMAIL PROTECTED]> > > To: "'Protel EDA Forum'" <[EMAIL PROTECTED]> > > Sent: Friday, September 27, 2002 5:28 PM > > Subject: Re: [PEDA] OT: termination for a multidrop bidirectional bus > > > > > > > What sort of speed are you running? What length is this bus. What are > > > you goals for the project: speed, size, cost?? Do you need 32 bits? > > > Could you incorporate a serial bus? What brand do you intent to use? > > > Some have series resistors built in (Phillips). Depending on your > > > answers, you could go from no termination to any method you mentioned > > > below. Welcome to the world of engineering and design tradeoffs... > > > > > > > > > > > > > -----Original Message----- > > > > From: Bevan Weiss [mailto:[EMAIL PROTECTED]] > > > > Sent: Thursday, September 26, 2002 9:53 PM > > > > To: Protel EDA Forum > > > > Subject: Re: [PEDA] OT: termination for a multidrop bidirectional bus > > > > > > > > > > > > Hi, > > > > sorry to ask this question to you guys, but I'm more likely > > > > to get an answer from the people dealing with the technology > > > > so to speak... > > > > > > > > What kind of termination is applicable for a multidrop > > > > bidirectional bus (using LVTTL signals)?? I've thought about > > > > series termination, one for each driver on the bus (however > > > > that would total 256 resistors for a 32bit wide bus). Thus > > > > it's not my preferred method. I also would prefer to avoid > > > > parallel termination (or thevenin equilavent or ac > > > > termination for that > > > > matter) just because they would take up more inter-trace spacing. > > > > > > > > I'm sure that many of you have had this kind of situation > > > > before and have some advice. It's for a student design > > > > project and the deadline is quickly approaching. > > > > > > > > Thanks, > > > > Bevan Weiss > > > > > > > > > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
