Stats

  • Locked Locked
  • Replies 3
  • Subscribers 166
  • Views 14040
  • Members are here 0
More Content
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Microvia and bbvia DRC support

Paul Fitzgeral

First some background. I have an 18 layer board with four sets of microvias and a core bbvia.

L1/L2

L2/L3

L3/L16

L16/L17

L17/L18

Our initial layout had the five sets of vias stacked on top of each other (our vendor preferred this method but had trouble building it). I am tasked with moving the vias apart so none of them are stacked. In essence, I am moving the L2/L3 and L16/L17 vias, therefore unstacking them. I need to turn on a DRC that will flag any stacked vias, as I have thousands on the board.  I have all of the other DRCs working, microvia-microvia, microvia-bbvai, etc (I have the Miniaturization license) but cannot find a DRC that will flag the stacked vias (ex. L1/L2 stacked on top of L2/L3) while not reporting vias that are in the same x/y but have a layer of separation between them. I can have an L1/L2 microvia in the same x/y as the L3/L16 core bbvia location. Please let me know if you need more details.

Parents
  • Paul Fitzgeral
    Hi Mike.
    The problem is I don't want a DRC when the bbvia/microvia are not on consecutive layers. If I have a L1/L2 and L2/L3 microvia on top of each other, I want a DRC to flag that as being stacked. If I have a L1/L2 on top of a L3/L16 via, I do not want this flagged as a DRC as this is acceptable for fabrication.
Reply
  • Paul Fitzgeral
    Hi Mike.
    The problem is I don't want a DRC when the bbvia/microvia are not on consecutive layers. If I have a L1/L2 and L2/L3 microvia on top of each other, I want a DRC to flag that as being stacked. If I have a L1/L2 on top of a L3/L16 via, I do not want this flagged as a DRC as this is acceptable for fabrication.
Children
No Data
Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.