RE: [IBIS-Users] How I can extract two value for vinh and vinl

Hello, Akilesh,

The interconnect specification (such as TTL or PCI) specifies the I/O
characteristics, including Vinh and Vinl.  For example, if I remember
correctly, TTL specifications are Vinl=0.8V and Vinh=2.0V.

If you are not using a standard interconnect, then see my paragraph about
PVT simulations.

Best regards,
Lynne



-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Akhilesh CHANDRA
Sent: Thursday, February 02, 2006 7:39 PM
To: Lynne D. Green
Cc: 'ibis-users'; 'ibis'; Akhilesh CHANDRA
Subject: Re: [IBIS-Users] How I can extract two value for vinh and vinl

Hello Lynne,

   I am not able to understand how these values come from interconnect
specification.

  I am also not able to understand what is externel specification.

  In my view I have a spice netlist and run our simulation to extract VINH
and VINL. According to me one design have one VINH and one VINL value at one
process, voltage and temp. How I can extract two value of VINH and VINL at
one process voltage and temp.

    Please correct if I am wrong.

Regards
Akhilesh

Lynne D. Green wrote:

>Hello, Akilesh,
>
>These values normally come from the interconnect specification.  If 
>there are no parameters equivalent to Vinh+, Vinh-, Vinl+ & Vinl-, then 
>these parameters are not used in the IBIS model.
>
>If you are not following an external specification, then you need to do 
>a complete PVT (process, voltage, temperature) analysis for Vinh and 
>Vinl (not just one corner).
>
>- Lynne
>
>
>"IBIS training when you need it, where you need it."
>
>Dr. Lynne Green
>Green Streak Programs
>http://www.greenstreakprograms.com
>425-788-0412
>lgreen22@mindspring.com
>
>
>-----Original Message-----
>From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On 
>Behalf Of Akhilesh CHANDRA
>Sent: Thursday, February 02, 2006 2:24 AM
>To: ibis-users; ibis
>Cc: akhilesh chandra
>Subject: [IBIS-Users] How I can extract two value for vinh and vinl
>
>
>
>Hi,
>
>     I have just one query. According to the IBIS specification we can 
>support Vinh+, Vinh-, Vinl+ & Vinl-.
>
>   I extract these valuse by applying one pulse at the input and find 
>out the voltage at which it switch from 0->1 and 1->0. According to me 
>I have only one value at one process, voltage temp. How I can extract 
>two value for vinh and vinl for one process, voltage and temp.
>
>Regards
>Akhilesh
>
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