Cross talk

 Cross talk:

• Cross talk is nothing but ,switching in one net can interfere neighbouring net due to the cross coupling capacitance between that , this is called as cross talk
• switching signal is Aggressor
• Non switching signal is victim

 Effects of Cross talk

• Cross talk leads to timing violations
• Functional failure

How cross talk will impact on the timing

• case 1
• If the signal is switching in same direction , victim transition becomes fast resulting data to arrival early which leads to hold violations
• This scenario is good for setup and bad for hold
• case 2
• if the signal is switching in opposite directions , victims transition becomes slows down ,which  increasing the delay and leads to setup violation
• This scenario is good for hold and bad for setup
• case 3 
• If cross talk in clock path the above cases are opposite 

Note

Same Direction means 

• Aggressor and victim signal state are changing from 0 to 1

Opposite Directions means

• Aggressor is switching from 0 to 1 and victim is switching from 1 to 0

Conditions for above 3 cases are , when Switching window will match then only timing violations will come otherwise noise will come