Syed:
See Below for some comments.
Bob Ross,
Interconnectix, Inc.
> Hello IBISgurus:
> I have been talking about IBIS to different groups at National and
> some questions regarding IBIS's capability came up.
> Can IBIS model an output stage with 'gradual turn-on' feature ?
> For example, products like LV TTL have gradual turn-on ckts on the
> output stage so if an Octal were to switch, GND bounce would be reduced.
> I would like to know if anyone has modeled this using IBIS.
YES, THE [RISING WAVEFORM] AND [FALLING WAVEFORM] KEYWORDS IN VERSION 2.1
HANDLE GRADUAL TURN-ON.
> The other question is, some product line(ex. GTL) have a feedback path
> from output to input. Is there any limitations with IBIS modeling this
> type of structure.
THE IBIS ARCHITECTURE DOES NOT HANDLE FEEDBACK FROM OUTPUT TO INPUT. THIS
WAS DISCUSSED LAST YEAR AT THE IBIS SUMMIT AND MAY AGAIN BE A TOPIC TO
DISCUSS FOR POSSIBLE INCLUSION IN IBIS VERSION 3.0
> My feeling is, 'gradual turn-on' or 'feedback' are very device specific
> features and IBIS simply sees the I/O structure and all else is a black
> box within the device.
> I would be curious if anyone is modeling LV TTL or GTL type of devices.
> Comments...questions..
> Regards,
> Syed.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Syed B. Huq
> Applications Engineer/Data Transmission Products
> National Semiconductor
> Tel:(408)721-4874; Fax:(408)721-4785
> Internet:huq@rockie.nsc.com
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Received on Wed Dec 14 12:03:52 1994
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