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Politics : Formerly About Advanced Micro Devices
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To: Charles R who wrote (75839)10/18/1999 2:14:00 PM
From: Yousef  Read Replies (1) of 1571536
 
Chuckles,

Re: "My understanding is this is tight pitched metal that is used mostly
for cache and datapath to increase the routing density but not used for
global routing (I have heard it being counted like 1/2 layer metal)."

Well, there are two types of "local interconnect" (LI) ... One way is
to just enlarge the contact (between Metal 1 and Poly). This allows
a Poly to Source/Drain connection. The disadvantage is that now
there are two different contact sizes present at etch. The other
method is like a metal layer where a dielectric is deposited and patterned
followed by conductor deposition and polish/etch. This approach is
much more complicated, but allows the LI to cross over poly lines. The
LI metal is usually thin and narrow so resistance is high ... This is
why it is only used for "short runs".

Make It So,
Yousef
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