[SI-LIST] Re: Calculating Zin for a DSP Clock
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 21 Nov 2014 16:46:56 +0000
There are several levels for package modeling in an IBIS file.
The first one is the [Package] keyword, which is required.
The 2nd level is under the [Pin] keyword, which is the line
you show below starting with L1. This is not required, but
if the values are present in the last three columns they will
override the values provided in [Package]. The third level is
the [Package Model] and [Define Package Model] keywords. If
these are present, they will override the previous two keywords.
I hope this helps,
Arpad
================================================================
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Jesús Castañé
Sent: Friday, November 21, 2014 4:49 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Calculating Zin for a DSP Clock
Hi Experts,
I'm trying to calculate the Zin for the CLK in the ADSP21469.
As far as I know I can use the next equation (Sorry for the plain text
format)
Zin= srqt [L_pin / (C_pin + C_comp ) ]
I have tried to find this parameters in the IBIS model but L_pin and C_pin
are defined as N/A
L1 CLKIN PDXO01DG NA NA NA
You can find the IBIS model in this link.
http://www.analog.com/static/imported-files/ibis_models/ad2146x_cspBGA_ibs_ver.1.3.txt
Why are these parameters defined as N/A? What am I missing?
Thank you so much for your help. I find this list really interesting.
Regards,
Jesús Castañé
uk.linkedin.com/in/jesusalbertocastanemartinez/
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