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Antenna violations

kulprashant

 Hi,

I found antenna violations (all violations are on the cell pin only(PIN A), each cell one violations,) like this around 20 violations are present.

All violations are on the metal3, which is highest metall layer in my design and i dont have antenna cell in my physical library.

Nanoroute has shown this violations.

Nanoroute has the some mode setup (options) for antenna like:
*** ignore antenna violations on top cell pins.

i have tried in either way (enabled and disbled both way ) but there is no change in results.

should i ignore these violations or i have to fix these violations.

i dont have any antenna cell in my physical lef or library, violations are presnt on the highest metal layer then how to solve this violations, 

Regards,

Kul 

  •  Hi Kul,

     Have you run your signoff physical verification antenna checks (PVS, Calibre, Hercules, etc.)? Sometimes they're part of the DRC deck, sometimes they are a separate deck. I would run that first to make sure these are real. Sometimes there are cases where the antenna parameters in the LEF do not or cannot model the antenna calculation correctly for some technologies, and you end up with a disconnect between what Nanoroute/FE thinks are antenna violations and what really are (according to signoff DRC/antenna deck).

     - Kari

  • Hi Kari,

    I have one querry regarding antenna. I had antenna violation and i solved by adding antenna diode or cell. when i dump the netlist Antenna cells are present in the netlist.

    Is this netlist create any problem in the STA analysis or in LVS check by calibre or i have to dump the netlist withought antenna cell.

    Thanks & Regards,

    Prashant 

  •  Hi Prashant,

     The antenna cells will not cause any problems in STA or LVS. In fact, they WOULD cause problems in LVS if you left them out of the netlist.

    - Kari 

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