Orcad Hierarchical Block Design

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Sampei - 26 Apr 2005 17:04 GMT

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

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Jim Thompson - 26 Apr 2005 17:46 GMT

>Hi,
>i have a problem about hierarchical block design in orcad. In a
[quoted text clipped - 8 lines]
>What can i do?
>thanks

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

I love to cook with wine. Sometimes I even put it in the food.

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Electronics Forum / CAD / April 2005

Orcad Hierarchical Block Design