[SI-LIST] Re: Vinl, Vinh, Vmeas
- From: "Tom Dagostino" <tom@xxxxxxxxxxxxx>
- To: <asic999@xxxxxxxxxxxxxx>, "'Muranyi,Arpad'" <Arpad_Muranyi@xxxxxxxxxx>
- Date: Fri, 27 Jan 2012 09:18:50 -0800
Vivek
I assumed, maybe incorrectly, that the output pins on your SDRAM were the DQ
signals that are the I/O signals for the data. Are you referring to other
signals? A buffer that is designated as I/O should have Vinh and Vinl
specified. An buffer that does not have an input function such as Output,
3-state, open_sink, etc. will not have Vinh or Vinl but should, like all
driving buffers have Vmeas specified.
The latest versions of IBIS Check do a good job of flagging missing parameters
when they are needed.
Tom Dagostino
Teraspeed Labs
9999 SW Wilshire St.
Suite 102
Portland, OR 97225
USA
971-279-5325 Office
971-279-5326 FAX
503-430-1065 Cell
tom@xxxxxxxxxxxxx
www.teraspeed.com <http://www.teraspeed.com/>
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827
From: asic999@xxxxxxxxxxxxxx [mailto:asic999@xxxxxxxxxxxxxx]
Sent: Friday, January 27, 2012 2:23 AM
To: Tom Dagostino; Muranyi,Arpad
Cc: si-list@xxxxxxxxxxxxx
Subject: Vinl, Vinh, Vmeas
Maybe it makes sense now as I can't set my digital buffer as an Input. I can
only set it as Output or High Z Output. Is it because as Tom suggested, a
mistake in IBIS? If so, ideally should the golden parser catch it?
Regards,
Vivek
From: "Tom Dagostino" <tom@xxxxxxxxxxxxx>
Sent: Fri, 27 Jan 2012 01:04:46
To: "'Vivek'" <asic999@xxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
Subject: Re: [SI-LIST]
Likely because somebody made a mistake. For an I/O line there should be
Vinh and Vinl specified. Vmeas is an output parameter not an input
threshold.
Tom Dagostino
Teraspeed Labs
9999 SW Wilshire St.
Suite 102
Portland, OR 97225
USA
971-279-5325 Office
971-279-5326 FAX
503-430-1065 Cell
tom@xxxxxxxxxxxxx
www.teraspeed.com
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Vivek
Sent: Thursday, January 26, 2012 9:40 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST]
Hi,
I've an IBIS model for a SDRAM. For all the address lines, the thresholds
are defined as Vinl and Vinh, but for the digital lines, it is just Vmeas. I
would like to know why is it defined differently and the related
significance.
Thanks
Vivek
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- » [SI-LIST] Re: Vinl, Vinh, Vmeas - Tom Dagostino
