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Explorer
Explorer
10,936 Views
Registered: ‎11-28-2011

Virtext 5 LVDS Rise time

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Aside from performing actual measurements, how can the expected rise time be determined for a particular device, say V5LX50.

 

I took a look at the IBIS files and there is content in there with respect to Rising Waveform, but don't know how to interpret it.

 

Trying to figure out the rise time for a LVDSEXT25. Would it be 90% of the time it takes to reach the VMAX?

 

So for example  0.9*1.644 = 1.4976 = appx .61NS

 

[Rising Waveform]
R_fixture= 50.0000
V_fixture= 1.2660
V_fixture_min= 1.1840
V_fixture_max= 1.3490
|time     V(typ)              V(min)              V(max)

0.0S              1.0090V           0.9719V             1.0340V
20.20pS           1.0090V           0.9719V             1.0340V
40.40pS           1.0090V           0.9719V             1.0340V
60.61pS           1.0090V           0.9719V             1.0340V
80.81pS           1.0090V           0.9719V             1.0340V
0.10nS            1.0090V           0.9719V             1.0340V
0.12nS            1.0090V           0.9719V             1.0340V
0.14nS            1.0090V           0.9719V             1.0340V
0.16nS            1.0090V           0.9719V             1.0340V
0.18nS            1.0090V           0.9719V             1.0340V
0.20nS            1.0090V           0.9719V             1.0340V
0.22nS            1.0090V           0.9719V             1.0340V
0.24nS            1.0090V           0.9719V             1.0340V
0.26nS            1.0090V           0.9719V             1.0340V
0.28nS            1.0090V           0.9719V             1.0340V
0.30nS            1.0090V           0.9719V             1.0340V
0.32nS            1.0090V           0.9719V             1.0340V
0.34nS            1.0090V           0.9719V             1.0340V
0.36nS            1.0090V           0.9719V             1.0330V
0.38nS            1.0090V           0.9719V             1.0330V
0.40nS            1.0090V           0.9719V             1.0350V
0.42nS            1.0090V           0.9719V             1.0410V
0.44nS            1.0090V           0.9719V             1.0470V
0.46nS            1.0090V           0.9719V             1.0740V
0.48nS            1.0090V           0.9719V             1.1300V
0.51nS            1.0090V           0.9719V             1.2090V
0.53nS            1.0110V           0.9719V             1.2890V
0.55nS            1.0150V           0.9719V             1.3570V
0.57nS            1.0190V           0.9719V             1.4150V
0.59nS            1.0230V           0.9719V             1.4650V
0.61nS            1.0340V           0.9719V             1.5000V
0.63nS            1.0630V           0.9718V             1.5300V
0.65nS            1.1150V           0.9718V             1.5500V
0.67nS            1.1710V           0.9718V             1.5670V
0.69nS            1.2240V           0.9720V             1.5850V
0.71nS            1.2700V           0.9733V             1.5950V
0.73nS            1.3110V           0.9757V             1.6050V
0.75nS            1.3460V           0.9781V             1.6140V
0.77nS            1.3740V           0.9807V             1.6240V
0.79nS            1.3970V           0.9830V             1.6330V
0.81nS            1.4150V           0.9854V             1.6380V
0.83nS            1.4290V           0.9913V             1.6420V
0.85nS            1.4410V           1.0080V             1.6460V
0.87nS            1.4510V           1.0340V             1.6500V
0.89nS            1.4590V           1.0700V             1.6540V
0.91nS            1.4660V           1.1070V             1.6550V
0.93nS            1.4720V           1.1420V             1.6570V
0.95nS            1.4770V           1.1730V             1.6580V
0.97nS            1.4830V           1.2020V             1.6600V
0.99nS            1.4890V           1.2260V             1.6610V
1.01nS            1.4955V           1.2590V             1.6615V
1.03nS            1.5000V           1.2850V             1.6620V
1.05nS            1.5030V           1.2990V             1.6630V
1.07nS            1.5060V           1.3090V             1.6630V
1.09nS            1.5090V           1.3200V             1.6630V
1.11nS            1.5100V           1.3270V             1.6630V
1.13nS            1.5120V           1.3330V             1.6630V
1.15nS            1.5140V           1.3380V             1.6630V
1.17nS            1.5150V           1.3430V             1.6640V
1.19nS            1.5170V           1.3470V             1.6640V
1.21nS            1.5170V           1.3520V             1.6640V
1.23nS            1.5180V           1.3550V             1.6640V
1.25nS            1.5180V           1.3580V             1.6640V
1.27nS            1.5190V           1.3620V             1.6640V
1.29nS            1.5200V           1.3650V             1.6640V
1.31nS            1.5200V           1.3680V             1.6640V
1.33nS            1.5200V           1.3700V             1.6640V
1.35nS            1.5200V           1.3720V             1.6640V
1.37nS            1.5210V           1.3750V             1.6640V
1.39nS            1.5210V           1.3770V             1.6640V
1.41nS            1.5210V           1.3790V             1.6640V
1.43nS            1.5210V           1.3810V             1.6640V
1.45nS            1.5210V           1.3820V             1.6640V
1.47nS            1.5210V           1.3840V             1.6640V
1.49nS            1.5210V           1.3850V             1.6640V
1.52nS            1.5210V           1.3860V             1.6640V
1.54nS            1.5220V           1.3870V             1.6640V
1.56nS            1.5220V           1.3880V             1.6640V
1.58nS            1.5220V           1.3890V             1.6640V
1.60nS            1.5220V           1.3900V             1.6640V
1.62nS            1.5220V           1.3910V             1.6640V
1.64nS            1.5220V           1.3910V             1.6640V
1.66nS            1.5220V           1.3920V             1.6640V
1.68nS            1.5220V           1.3920V             1.6640V
1.70nS            1.5220V           1.3930V             1.6640V
1.72nS            1.5220V           1.3930V             1.6640V
1.74nS            1.5220V           1.3930V             1.6640V
1.76nS            1.5220V           1.3940V             1.6640V
1.78nS            1.5220V           1.3940V             1.6640V
1.80nS            1.5220V           1.3940V             1.6640V
1.82nS            1.5220V           1.3940V             1.6640V
1.84nS            1.5220V           1.3940V             1.6640V
1.86nS            1.5220V           1.3950V             1.6640V
1.88nS            1.5220V           1.3950V             1.6640V
1.90nS            1.5220V           1.3950V             1.6640V
1.92nS            1.5220V           1.3950V             1.6640V
1.94nS            1.5220V           1.3950V             1.6640V
1.96nS            1.5220V           1.3950V             1.6640V
1.98nS            1.5220V           1.3950V             1.6640V
2.00nS            1.5220V           1.3950V             1.6640V

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Xilinx Employee
Xilinx Employee
18,898 Views
Registered: ‎08-01-2012

Re: Virtext 5 LVDS Rise time

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As mentioned in previous post from IBIS model you can find rise time .Also please note that the board layout PCB tracks, load capcitances also rise time, So the best option is doing IBIS simulations as per board layout.

 

 The IBIS models for Xilinx devices available in the following link 
http://www.xilinx.com/support/download/index.htm 

 

 

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3 Replies
Scholar austin
Scholar
10,929 Views
Registered: ‎02-27-2008

Re: Virtext 5 LVDS Rise time

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You run the IBIS file in a simulation of what you are trying to evaluate.

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose
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Xilinx Employee
Xilinx Employee
18,899 Views
Registered: ‎08-01-2012

Re: Virtext 5 LVDS Rise time

Jump to solution

As mentioned in previous post from IBIS model you can find rise time .Also please note that the board layout PCB tracks, load capcitances also rise time, So the best option is doing IBIS simulations as per board layout.

 

 The IBIS models for Xilinx devices available in the following link 
http://www.xilinx.com/support/download/index.htm 

 

 

________________________________________________

Please mark this post as an "Accept as solution" in case if it helped to resolve your query. So that it will help to other forum users to directly refer to the answer.

Give kudos to this post in case if you think the information is useful and reply oriented.

View solution in original post

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Moderator
Moderator
10,906 Views
Registered: ‎02-16-2010

Re: Virtext 5 LVDS Rise time

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If you have IBIS editor, you can view the data in terms of rising waveform like below.Once you have the .ibs file opened in ibis editer, select the IO standard, right click to view ibis data.

 

Whrising.JPG

 

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