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
> > > >
> > >
> >
>

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