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spectre says "The following branches form a loop of rigid branches "

there is no connection to the particular node...which spectre is listing . i dont know why it keeps pointing out the error . please check this

Fatal error found by spectre during topology check.
FATAL: The following branches form a loop of rigid branches (shorts) when added to the circuit:
I16:w_position_flow (from state to 0)

but as per my circuit that connection is must .. so suggest possible solution

Frank Wiedmann over 10 years ago

I did not mean those pins. I was talking about the wire labels "data", "datab" and "mem" and the pin named "state".
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eashwar g over 10 years ago

aww .. crap from this side ... thanks a hell .. its done now ., thanks again ... thank u very much
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eashwar g over 10 years ago

but now i get this illegal bus reference number error Illegal bus reference - Can't tap "<db2>" from net "db1" i need to connect two pins to a same source say db1 and db2 to voltage bl ..so that depending on logic function either db1 or db2 will take the source
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Andrew Beckett over 10 years ago

Unknown said:
but now i get this illegal bus reference number error Illegal bus reference - Can't tap "<db2>" from net "db1" i need to connect two pins to a same source say db1 and db2 to voltage bl ..so that depending on logic function either db1 or db2 will take the source

Please can you read the forum guidelines. Your questions are rather assuming that we can see your design or read your mind...

Kindest Regards,

Andrew.
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Frank Wiedmann over 10 years ago

It's not really clear for me what you are trying to do; a schematic would be helpful. I also suggest that you study chapter 2 named "Understanding Connectivity and Naming Conventions" of the Virtuoso Schematic Editor L User Guide (also available at http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=pubs;q=/comphelp/comphelp6.1.6/chap2.html).
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eashwar g over 10 years ago

i was just mentioning ... sorry for this ., i didnt think that this would happen ., sorry for this again if we want to connect two buses(diffrent names) to a single source i was geting that error ., what are the possibilities to solve this error ., please suggest so that i can eliminate this error
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eashwar g over 10 years ago

i have atached schematic below

the db1,db2,db3 db4 as shown are connected to one node
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Andrew Beckett over 10 years ago

Unknown said:
the db1,db2,db3 db4 as shown are connected to one node

Since there are no labels visible on your picture, answering this is going to be rather hard...

This might be about using the "patch" component (see the manuals that Frank mentioned), but I have no idea what you're trying to do.

Maybe contacting customer support would be more efficient than sending partial bits of information back and forth.

Regards,

Andrew.
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eashwar g over 10 years ago

i am reading the document .,meanwhile i have increased labels size ., check the schematic
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Frank Wiedmann over 10 years ago

You can't give several different names to a single wire (without using some tricks, at least). Simply delete three of the four labels and your problem should be gone.
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