Stats

  • Locked Locked
  • Replies 9
  • Subscribers 91
  • Views 19333
  • Members are here 0
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

A problem with a BlackBox

meri

 Hi! I'm using a RAM of the AMS in my digital circuit. 

I've defined a blockbox with the line:  setImportMode -treatUndefinedCellAsBbox 1, and now I'm trying to load its floorPan (because I would like to see in the layout the metal of this block). These are the errors and warnings (they appears either if I load the floorPlan before then after defining the floorplan of the whole circuit):

**ERROR: Die Area is not defined
**WARN: Design Area's lower left corner is not on manufacture grid.
**WARN: Design Area's upper right corner is not on manufacture grid.
**ERROR: Incorrect width (0.00000)

Thanks a lot! 

 

Parents

  • Hi!


    First af all thanks for you precious support!

    You`re right, we have the .lef and the .lib of the RAM (obtained by a compiler). But in Cadence Virtuoso we can see not only the pin (pin metal 2 i.e.), but also the metal connected to the pin. In Encounter, on the contrary, we see only the pins. Then, we have other two problems:
    1) Encounter doesn`t connect the power supply and ground pins of the memory respectively to the nets vdd! e gnd! . So, there is a short-circuit between ground and power supply made by a filler cell, placed between one of the pins of power supply and one of those of ground, while the other pins (there are 3 pins for vdd and 3 for ground) are floating. This doesn`t happen for the inputs or the outputs.
    2) There is a metal routed in the space where has to be placed the memory (recognised as a "blackbox"): how can I avoid that Encounter routes any metal on the "blackbox"?

    Thanks again!

    Meri

Reply

  • Hi!


    First af all thanks for you precious support!

    You`re right, we have the .lef and the .lib of the RAM (obtained by a compiler). But in Cadence Virtuoso we can see not only the pin (pin metal 2 i.e.), but also the metal connected to the pin. In Encounter, on the contrary, we see only the pins. Then, we have other two problems:
    1) Encounter doesn`t connect the power supply and ground pins of the memory respectively to the nets vdd! e gnd! . So, there is a short-circuit between ground and power supply made by a filler cell, placed between one of the pins of power supply and one of those of ground, while the other pins (there are 3 pins for vdd and 3 for ground) are floating. This doesn`t happen for the inputs or the outputs.
    2) There is a metal routed in the space where has to be placed the memory (recognised as a "blackbox"): how can I avoid that Encounter routes any metal on the "blackbox"?

    Thanks again!

    Meri

Children
No Data

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.