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lef and def , def lef , lef def , def lef
10 Threads found on Gds Lef Def
how to differentiate above three, can anyone brief it.
def could contains netlist, routing, placement, scan info, port... lef is a simplify view of macro/pad views instead using gds, that should contain the pin (metal position size type) and obstruction to allow the PnR to route it.
Yes, In your case - LVS & QRC QRC supports two independent flows : 1. LVS flow 2. lef-def - also if design is in Open-Access, run QRC before you port to gds or OASIS. rsf is old - ccl is new. The good thing is - same unified qrcTechFi
I know on gds-II streamin icfb can build you a "best guess" techfile. I do not know whether the lef/def import does the same, I don't use that. If it does, use that to get a techfile. You can always edit the stream layer table to add the ones that have trouble.
star RCXT can extract from gds, def it require lef file and nxtgrd if you work with def, it will indicate any short nets (not clean, replay :-) in your flow, the star rcxt step will normaly occurs only after the routing & finishing phase and before the STA and to be sync, that depend how you work, by scripting is (...)
Hello, Can anyone tell me how to use Cadence Voltage Storm for Power and Rail Analysis? I have this database from Magma (def, lef and gds) on which I need to perform the power and rail analysis using Voltage Storm. Whats the flow to achieve the same? Thanks in advance, Chetan
def => Design Exchange Format, Design Exchange Format (def) is an open specification for representing physical layout of an integrated circuit in an ASCII format. It represents the netlist and circuit layout. def is used in conjunction with lef to represent complete physical layout of an integrated circuit while it is (...)
hi, what you want is a whole flow. you have to p&r your design and generate gds, and then suing abstract from c@dence to extract lef file. or you can use encounter or astro to extract lef,but accuracy is a matter.
why not. if you got gds (from magma), you can check it with any drc tools include calibre, assura, hercules etc.
in your case, you should pipo out the gds file and do full gds extraction for analog design. or run abstract first to get the std cell lef file first, and stay with def flow for std cell digital design.