The document discusses crosstalk delay analysis, focusing on positive and negative crosstalk delays between coupled nets. Positive crosstalk delay occurs when the aggressor and victim nets switch in the same direction, reducing charge and delays, while negative crosstalk delay results when both nets rise simultaneously, also leading to reduced delays. Additionally, it addresses how capacitances are accounted for in delay calculations when neighboring nets are either steady or switching.

1. CROSSTALKDELAY ANALYSIS

2. • Positive Crosstalk delay : The coupled (aggressor) net and the victim net are
switching in the same direction, the charge on Cc remains the same before
and after the transitions of the victim and aggressor.
• This reduces the charge required from the driving cell of the victim net.
• The delays for the driving cell and the interconnect for the victim net are
reduced.

3. • NEGATIVE CROSSTALK DELAY :The aggressor net is rising at the same time as the
victim net. The aggressor net switching in the same direction as the victim
reduces the delay of the victim net.
• As before, the negative crosstalk affects the timing of the driving cell as well as
the interconnect - the delay for both of these is reduced.

4. • These capacitances are considered as part of the total net capacitance
during the basic delay calculation (without considering any crosstalk).
• When the neighboring nets are steady (or not switching), the inter-
signal capacitances can be treated as grounded.

5. • Aggressor net steady :

6. • Aggressor switching in same direction :

7. • Aggressor switching in opposite direction :

8. • Aggressor Victim Timing Correlation :