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Question regarding Metal Tracks

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Benefits of using Metals in uni-directional ???????

Hello

what are the benefits of using Metals in uni-directional ?
Could anyone please explain what do you mean by 9 metal track or 12 metal track, in detail?

Thanks in advance

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Metals are used in 1 direction for the very simple reason that if you route a horizontal layer vertically, it can block the path for the same metal routes.
| x----------------
| x--------------------
| x----------------
------------------|

I've tried to draw this, but if you see the vertical route of the metal layer , it is blocking the other horizontal routes on the same layer. Although it is not a strict rule, you can route in both directions when you are confident that it will not block or congest your design.

9 or 12 metal tracks mean that in the design process, you are allowed to use max of 9 or 12 metal layers for your connections.
 
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