Re: [IBIS-Users] IBIS dual power supply

Mei

What I do is to create min/typ/max subcircuits that have the proper 
voltages for any additional voltage rails necessary for the device.  The 
voltage in s2i then is applicable for only the I/O voltage rail.

Scott

Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax

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NG,MEI-YEE wrote:
>
> Hi Tom,
>
>  
>
> I understand your point but what if I have some buffers taking supply 
> from DVDD and some from AVDD, but they are all modeled in the same 
> IBIS file? There is no control for me to state in which case I should 
> connect the power to AVDD and which case to connect to DVDD in the 
> .s2i file.
>
>
> Thank you.
>
>  
>
> //Best regards,//
>
> **Mei Yee**
>
> SID, Avago Technologies (Malaysia)
>
> Tel no.:604-6108515
>
> ------------------------------------------------------------------------
>
> *From:* Tom Dagostino [mailto:tom@teraspeed.com]
> *Sent:* Thursday, November 09, 2006 6:49 PM
> *To:* NG,MEI-YEE; 'Ambrish Varma'; ibis-users@server.eda.org
> *Subject:* RE: [IBIS-Users] IBIS dual power supply
>
>  
>
> When doing an IBIS model the supply of concern is the one connected to 
> the I/O buffer. 
>
>  
>
>  
>
> Tom Dagostino
> Teraspeed(R) Labs
> 13610 SW Harness Lane
> Beaverton, OR 97008
> 503-430-1065
> tom@teraspeed.com
> www.teraspeed.com
>
> Teraspeed Consulting Group LLC
> 121 North River Drive
> Narragansett, RI 02882
> 401-284-1827
>
>     -----Original Message-----
>     *From:* owner-ibis-users@server.eda.org
>     [mailto:owner-ibis-users@server.eda.org] *On Behalf Of *NG,MEI-YEE
>     *Sent:* Thursday, November 09, 2006 12:41 AM
>     *To:* Ambrish Varma; ibis-users@server.eda.org
>     *Subject:* [IBIS-Users] IBIS dual power supply
>
>     Hi experts,
>
>      
>
>     Need your guidance in a simple question. My chip has dual power
>     supply, meaning AVDD and AGND for analog core and DVDD and DGND
>     for digital core. In the .s2i file Pin List, I specify each to be
>     POWER and GND model accordingly. But when I run the s2ibis3, it
>     will only connect a voltage source to AVDD and not to both the
>     VDD. How do I specify the pin list for this case?
>
>      
>
>     Thank you.
>
>      
>
>     Best regards,
>
>     Mei Yee
>

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