Subject: WaVEFORMS FOR BIRD12.1

From: [email-masked] ( Bob Ross)
Date: Mon, 9 May 94 18:21:11 PDT

To Jon Powell, Arpad Muranyi, and IBIS Committee:

This is an open implementation preference question based on the waveforms
you have sent.  In particular, refer to Jon Powell's "Synchronizing
Measure AC Waveforms ... " document recently sent which illustrates
the synchronization of rising and falling waveforms measured into 
50 Ohm loads at 0, 2.5 and 5V.

How do you "blend" certain data combinations that would be allowed via the
BIRD12 [Rising waveform] and [Falling waveform] mechanisms?  And which
form would you prefer seeing?

Cases -->             (1)   (2)   (3)   (4)

Low_To_High:
  50 Ohm to Vcc              *     *  
  50 Ohm to Vcc/2                  *     *
  50 Ohm to GND        *     *     *

High_To_Low:
  50 Ohm to Vcc        *     *     *    
  50 Ohm to Vcc/2                  *     *
  50 Ohm to GND              *     * 

Note, Case (1) corresponds to the [Ramp] specification conditions in IBIS
Version 1.1.

Bob Ross
Interconnectix, Inc.