Re: [IBIS-Users] PULL-UP and PULL-DOWN problem

From: lau yy <tok47_at_.....>
Date: Sun May 08 2005 - 23:17:40 PDT
Dear Mithlesh,


Thanks. I solve most of the pins problem.

The fault that I make was :

FYI, this is a stacked product. And  I join-up the IO supply
for 2 same products. SO, I got the problem.


Now, I seperate it and I get normal reading.


But there are some pins that joining input address with IO pins. This need 
some time to figure out the problem. Will let you know when I solve it.


rdgs
YYLAU






<br><br><br>&gt;From: Mithlesh Shrivas 
&lt;mithlesh.shrivas@freescale.com&gt;<br>&gt;To: 
tom@teraspeed.com<br>&gt;CC: lau yy &lt;tok47@hotmail.com&gt;, 
ibis-users@eda.org<br>&gt;Subject: Re: [IBIS-Users] PULL-UP and PULL-DOWN 
problem<br>&gt;Date: Mon, 09 May 2005 09:36:03 
+0530<br>&gt;<br>&gt;Hi,<br>&gt;I had a similar kind of problem.I found that 
my esd_boost signal was <br>&gt;connected to vdd (core supply) rather ovdd 
(IO supply). I changed <br>&gt;the connection and it worked.  So 
this<br>&gt;could be because of some wrong 
connections.<br>&gt;<br>&gt;regards,<br>&gt;Mithlesh<br>&gt;<br>&gt;<br>&gt;Tom 
Dagostino wrote:<br>&gt;<br>&gt;&gt;This looks like your enable control is 
in the wrong state.<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;Tom 
Dagostino<br>&gt;&gt;Teraspeed Labs<br>&gt;&gt;13610 SW Harness 
Lane<br>&gt;&gt;Beaverton, OR 
97008<br>&gt;&gt;503-430-1065<br>&gt;&gt;http://www.teraspeed.com 
&lt;http://www.teraspeed.com/&gt;          
<br>&gt;&gt;tom@teraspeed.com<br>&gt;&gt;<br>&gt;&gt;Teraspeed Consulting 
Group LLC    121 North River Drive             <br>&gt;&gt;Narragansett, RI 
02882            401-284-1827<br>&gt;&gt;<br>&gt;&gt;Teraspeed is the 
registered service mark of<br>&gt;&gt;Teraspeed Consulting Group 
LLC<br>&gt;&gt;<br>&gt;&gt;     -----Original Message-----<br>&gt;&gt;     
From: owner-ibis-users@eda.org 
<br>&gt;&gt;[mailto:owner-ibis-users@eda.org]On<br>&gt;&gt;     Behalf Of 
lau yy<br>&gt;&gt;     Sent: Friday, May 06, 2005 3:24 PM<br>&gt;&gt;     
To: ibis-users@eda.org<br>&gt;&gt;     Subject: [IBIS-Users] PULL-UP and 
PULL-DOWN problem<br>&gt;&gt;<br>&gt;&gt;     Dear 
ALL,<br>&gt;&gt;<br>&gt;&gt;     I already solve the previous problem. That 
just a small bug in<br>&gt;&gt;     IBIS. I just need to correct it manually 
and it will be fine.<br>&gt;&gt;<br>&gt;&gt;     Here, I got another 
questions.<br>&gt;&gt;<br>&gt;&gt;     Do anyone know what will cause 
[PULLUP] and [PULLDOWN] will <br>&gt;&gt;have 0<br>&gt;&gt;     current flow 
from -1.8v to 1.8v? I shared my datas below.<br>&gt;&gt;<br>&gt;&gt;       
-1.8000       0.000A              0.000A              
0.000A<br>&gt;&gt;<br>&gt;&gt;       -1.7000       0.000A              
0.000A              0.000A<br>&gt;&gt;<br>&gt;&gt;        
.<br>&gt;&gt;<br>&gt;&gt;        .<br>&gt;&gt;<br>&gt;&gt;        
.<br>&gt;&gt;<br>&gt;&gt;        1.7000       0.000A              0.000A     
          0.000A<br>&gt;&gt;<br>&gt;&gt;        1.8000       0.000A          
     0.000A              0.000A<br>&gt;&gt;<br>&gt;&gt;        1.9000       
14.6800uA           14.9900uA           
<br>&gt;&gt;14.2500uA<br>&gt;&gt;<br>&gt;&gt;        2.0000       15.7200uA  
          16.0200uA           
<br>&gt;&gt;15.2900uA<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;     
And why this errors will occur?<br>&gt;&gt;<br>&gt;&gt;     ERROR - Model 
IO31: The [Rising Waveform]<br>&gt;&gt;<br>&gt;&gt;           with 
[R_fixture]=70 Ohms and [V_fixture_min]=0V<br>&gt;&gt;<br>&gt;&gt;           
has MIN column DC endpoints of  0.00V and  0.00v, 
but<br>&gt;&gt;<br>&gt;&gt;           an equivalent load applied to the 
model's I-V tables <br>&gt;&gt;yields<br>&gt;&gt;<br>&gt;&gt;           
different voltages (-0.90V and  0.00V),<br>&gt;&gt;<br>&gt;&gt;           a 
difference of -100.04% and 66.57%, respectively.<br>&gt;&gt;<br>&gt;&gt;     
ERROR - Model IO31: The [Falling Waveform]<br>&gt;&gt;<br>&gt;&gt;           
with [R_fixture]=70 Ohms and [V_fixture_max]=0V<br>&gt;&gt;<br>&gt;&gt;      
      has MAX column DC endpoints of  0.00V and  0.00v, 
but<br>&gt;&gt;<br>&gt;&gt;           an equivalent load applied to the 
model's I-V tables<br>&gt;&gt;     yields<br>&gt;&gt;<br>&gt;&gt;           
different voltages (-0.90V and  
0.00V),<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;     
Thanks<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt; 
     rdgs<br>&gt;&gt;<br>&gt;&gt;     yylau<br>&gt;&gt;<br>&gt;&gt;     
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Received on Sun May 8 23:17:43 2005

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