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How Double Width Routes for clock nets help to avoid cross talk?

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sahana

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Hi All,

Can any body explain how Double Width Routes for clock nets help in avoiding cross talk?
 

Re: Double width Routes

Sahana,

Are you sure that its Double width or you wanna know about Double spacing??
 

Re: Double width Routes

its double width only.
 

Hi,

Can someone explain about double width option? How they will be physically realised and what will be the ramifications be if there are any

regards
 
@ sahana: It is a good practise to use Double Width Double Spacing (DWDS) routes in clock network. Double width nets are used to avoid electromigration and double spacing nets are used to avoid Crosstalk .

@ pavan: In Encounter you can specify non-default rule DWDS for clock tree synthesis.

############### Create NDR for Double Width Double Spacing #############
initNdr
setNdrWidth -layer M1 0.18
setNdrSpacing -layer M1 0.18
setNdrWidth -layer M2 0.2
setNdrSpacing -layer M2 0.2
setNdrWidth -layer M3 0.2
setNdrSpacing -layer M3 0.2
setNdrWidth -layer M4 0.2
setNdrSpacing -layer M4 0.2
setNdrWidth -layer M5 0.2
setNdrSpacing -layer M5 0.2
setNdrWidth -layer M6 0.2
setNdrSpacing -layer M6 0.2
setNdrWidth -layer M7 0.2
setNdrSpacing -layer M7 0.2
setNdrWidth -layer M8 0.8
setNdrSpacing -layer M8 0.8
setNdrWidth -layer M9 0.8
setNdrSpacing -layer M9 0.8
setNdrSpacing -hardSpacing 1
createNdr DWDS

Specify width and spacing double than that is given in LEF for each metal layer. Also check the name of layer in LEF it may METAL rather simply M. Paste it in a file. Use this file as PLUG for CTS.
It will use DWDS rule only for CTS.
 

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