RE: [IBIS-Users] IBIS dual power supply

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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