[SI-LIST] Re: The Implications of Nonmonotonic Transitions

I observed this behavior a while ago with a very large FPGA in a BGA package.  
At the pin the signal looked very bad and the engineer on the project had me 
look at it.  I got an HSPICE model of the package from the vendor and the 
simulation showed the same signal at the pin as seen by the 'scope but a really 
nice signal at the bonding pad on the die.


dav0
David Lieby



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Andrew Ingraham
Sent: Thursday, January 22, 2009 8:40 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: The Implications of Nonmonotonic Transitions

Another thing to consider with non-monotonic signals, is that it depends on 
exactly where you measure.  In addition to what Rob LaMoreaux said (maybe
off-line?) about non-monotonic waveforms at or near a driver, I've seen cases 
where signals on a point-to-point net were badly mon-monotonic at an IC input 
pin, but probably not at the die pad inside the IC.  SPICE simulations showed 
this, and the observed waveform was reasonably close to the simulated one at 
the IC pin.  If memory serves, one of these was the input to a PLD in a DIP 
thru-hole package.

Some DRAMs are strange and mysterious beasts and I'd listen to whatever their 
datasheet says.

Andy


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