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Hello friends welcome to my YouTube
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channel called silicon vsi today we will
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discuss about types of fire in layout it
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will be in analog layout as well as in
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memory layout so the first thing how why
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we are using the wire this VRE we are
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using to connect between two metal metal
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1 to Metal 2 we are using wire one Metal
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2 to metal 3 we are using yre 2 so like
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this is the connection between metal one
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and to like lower metal to higher metal
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so first wire what we are using here is
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wire let's assume this is metal
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one this is Metal 2 so for that we are
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using a square wire this is the
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crosssection yre one this is metal one
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this is Metal 2 so for that first type
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of wi is a square wire what we are using
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or a single wire we can say if overlap
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is a small we are using a single wire
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second type is rectangular wire or buer
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wire rectangular wire
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wire so if we have enough space it is
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always better to use a bar wire instead
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of square wire Metal 2 metal one I'm not
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doing this I'm not drawing this cross
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section I'm just doing
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drawing just just overum so this is bar
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let's assume the square wi size is 32 by
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32 nanom so in this case the bar wire
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nanom so in our design it is always
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better to use bar wire instead of the
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square wire so this wire is a very good
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wire in our layout design so this is
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wire now the third type of wire is a
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large yre means it is bigger than the
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square wire as well as a rectangular wi
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so let's assume Square wire size is 32
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by 32 nanom large wire like
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n so in case of large wire
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it will be 64 nanom by 64 Nan so
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wherever possible use large
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wire so this is a large wire this is
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very good wire as compared to square
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wire and wi fourth type is St wire or we
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wire St wire means what let's assume you
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are drawing metal one and metal two like
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way this is metal one this is Metal
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2 then you are connecting with Y 1 it
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will be like Square Y Bar y or
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rectangular y on the same thing on the
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same n metal 2 is connected with metal 3
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so you drawing another metal of metal 3
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here so you are putting somewhere here
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or somewhere so it is always better to
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put it here not here in this region like
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if possibilities are there Y2 this is y
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one so why I'm saying because it is more
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friendly or more more we can say it is
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friendly so this call is t d
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so I'm not saying we should we must put
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like this way but if there is a chance
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we should put it like St St means what
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one above other like this one this is y
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3 so connection wise if you see here
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one to metal 3 like or metal four like
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straightforward so if if you are using
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not not this kind of thing like this way
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like if you using yre 2 here yre three
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here y 4 it's kind of letter like path
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this but here the path is very straight
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this you are getting my point right this
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is called St so we have three four type
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of wire one is square wire bar wire
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large wire and St wire
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so far we are using this kind of wire in
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our VSA design so if you have any other
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wire if you know any other wire please
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mention in comment if you like this
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video please subscribe my channel thank
