salma ali bakr said:I'm getting a bit confused these days about the word "layout"
is it the making of the mask layers for the IC ?
or is it the process of floorplanning and place & route ?
or are they at the end allll extensions to each other???
in an ASIC, when exactly do I do the mask layout for each transistor?
when it's a small design, or it's always done this way....???
should i see the P&R plan then do according to it the mask layout or what?
I'm confused about terminology and hierarchy of steps
thanks,
Salma
salma ali bakr said:i was just confused about the fact that we say layout about p&r and also about the mask layout
but now i know the difference between them, for instance if i have a full custom ASIC, i'll be doing the mask layout for my cells (cause they'll be somehow unique) and then i'll generate a symbol (i guess) which is then used in a library for the p&r tool (if it isn't custom then the p&r tool will use the fab standard cells)...
and if i have a standard cell ASIC, then i won't need to do the mask layout for my cell cause they'll be already designed by the fab
and now also i know that it's usually a GDS extension for layout (representing the geomertical shapes and the labels of the layout)....but for p&r ? what's the output ? is it also GDS or any other tool specific extension or something else???
am i missing something guys? or confusing stuff?
Salma
pratap_v said:Hi
full custom or standard cell designing is done only if the previous library cells could not meet your design characteristics like performance,power etc..,
salma ali bakr said:pratap_v said:Hi
full custom or standard cell designing is done only if the previous library cells could not meet your design characteristics like performance,power etc..,
Well, I guess you meant only Full Custom
cause Standard Cell means you use the "already existing" cells
Thanks,
Salma
pratap_v said:full custom or standard cell designing is done only if the previous library cells could not meet your design characteristics like performance,power etc..,
salma ali bakr said:Full custom is when you do every single thing from scratch, right? Cause it's all unique and you need to meet certain constraints that aren't available otherwise
Semi custom has two types:
-Standard Cells: when you already have the cell libraries available and you just need to do the placement and the routing
-Gate Arrays: when you have the cells already placed and you just need to do the routing (interconnections)
He was just referring to Full Custom and Standard Cells as one thing
so I wanted to know his point of view and explain that it isn't the same
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