Registration is free. Click here to register now. Register Log in. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter sowmya Start date May 12, Status Not open for further replies. Hi Friends, I would like to know what is crosstalk delay and crosstalk noise?
How is crosstalk delay analysis and noise analysis done? What are the inputs and outputs? Please elaborate on differences between crosstalk delay and crosstalk noise. Thanks, Sowmya. Nantha Member level 1. These coupling capacitances caused the crosstalk. It will make the crosstalk delay and crosstalk noise due to the wire load increasing. That's what we are doing in the Design Rule Check.
I think rgds, Nantha. Crosstalk delay: Let's say one net is switching at faster rate time taken for signal level to rise from 0 to 1 is less and other net switching at slower rate time taken for signal level to rise from 0 to 1 is less , due to coupling cap Now due let's assume crosstalk delay occurs and it affects a clock buffer in clock path P2. Then now L1 will no more equal to L2 and now clock tree is not balanced. Here we have considered only one clock buffer got affected by the crosstalk delay but in reality, the effect could be in many places.
Crosstalk delay can violate the setup timing. Figure, shows the data path, launch clock path and capture clock path. For setup timing, data should reach the capture flop before the required time of capture flop. So if there is an increase of delay in the data path or launch clock path it may cause setup violation.
Setup violation may also happen if there is a decrease in delay on the capture clock path. These effects of crosstalk delay must be considered and fixed the timing. Hold timing may be violated due to crosstalk delay. Figure, explains the situations where the hold time could violate due to crosstalk delay.
If there is a decrease in the delay of any cells in the data path and launch clock or there is an increase of delay of cells in the capture clock path due to crosstalk delay, It may result in the hold timing violation. Such cases must be considered and fix the timing. This article is being too long, so we will stop here and will continue the remaining part, timing window analysis and crosstalk prevention techniques in the next article.
Newer Post Older Post Home. Subscribe to: Post Comments Atom. Figure Raising and Falling glitch in crosstalk. Figure Safe and unsafe glitch based on glitch heights. Hence crosstalk is regarded as inductive noise. Coupling between lines can be capacitive electrostatic coupling due to the stray parasitic capacitance, or can be inductive electromagnetic coupling resulting from the mutual inductance.
As a result of these, noise is induced. The following are illustrations of the two types of coupling and the simplest equivalent circuits in each case. The crosstalk noise refers to unintentional coupling of activity between two or more signals. Relevant noise and crosstalk analysis techniques, namely glitch analysis and crosstalk analysis, allow these effects to be included during static timing analysis and are described in this chapter. These techniques can be used to make the ASIC behave robustly.
Unable to display preview. Download preview PDF.
0コメント