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Orcad Hierarchical Block Design

Discussion in 'CAD' started by Sampei, Apr 26, 2005.

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  1. Sampei

    Sampei Guest

    Hi,
    i have a problem about hierarchical block design in orcad. In a
    circuit i should introduce a black box:in this moment i don't know
    what is inside this black box but i know which pins are used, so i
    decided to use the hierarchical design.I want to work in layout
    leaving a free space for the black box so i can add the circuit
    later.I tried to create netlist,but a message error appears:
    ERROR [MNL0022] Unable to Open MNL Output File -
    C:\WINDOWS\DESKTOP\VITO\CIRCUITO\TESINA.MNL
    ERROR [NET0011] Netlist failed or may be unusable.
    What can i do?
    thanks
     
  2. Jim Thompson

    Jim Thompson Guest

    Your problem is simply floating nodes...

    Assign pins to block, as I presume you've already done.

    "Descend" or "Push" into block. OrCAD will ask for a schematic name.
    Provide it... maybe dummyblock.sch ;-)

    In the block create ports that match the block pin names.

    From each of these ports connect a resistor, say 1G-ohm to GROUND.

    "Ascend" or "Pop" out of this block into the TOP level. Confirm SAVE
    when asked.

    Later replace schematic of block with one with actual contents.

    Of course you're probably using Capture (gag me with a spoon), so you
    still may have difficulties :-(

    ...Jim Thompson
     
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