what kind of CAD sw do you use?

  1. JOEL_HWANG
    JOEL_HWANG
    Hi all!!
    Today signed up here.
    I use ORCAD and PADS and start to learn Expedtion pcb recently.
    I wonder what kind of cad mostly used.
    Could you leave you comment?
    Have a nice day.
    Joel
  2. kabaleevisu
    kabaleevisu
    HI
    I am using cadence allegro 16.2 it is most useful cad tool
  3. moataz fouad
    moataz fouad
    Hi,
    I use OrCAD Layout & PCB Editor (Allegro).
  4. kabaleevisu
    kabaleevisu
    hi every one

    any body now how to length matching is matched in perticular net ??
  5. cks3976
    cks3976
    Length matching can be done by defining a pair of traces as differential in Orcad capture (version 16.x). This will automatically create a net class as differential and add these traces to that net class. And length matching will be taken care by the Tool (Allegro/Pads etc). Alternately you can create a differential net class in layout tool also.

    Hope that helps
  6. karthiksmartone
    karthiksmartone
    why we take clock as a ref in length matching?
  7. anilrock87
    anilrock87
    Hi,
    I use ALTIUM
  8. SHABU
    SHABU
    Hi ,

    I use Allegro & Altium
  9. SHABU
    SHABU
    Hi karthiksmartone,

    The data group operates at twice the clock speed and its signal integrity is of higher concern. In addition, the data group constitutes the largest
    portion of the memory bus and consists of the majority of the trace matching requirements, those of the data lanes.
    The address/command, control, and the data groups all have a relationship to the routed clock. Therefore, clock is taken as a reference for length matching ddr signals.
  10. kabaleevisu
    kabaleevisu
    can you explain about DDR placement ??
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