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techfile vs TLUPlus file extraction difference in ICC,and when are these to be used?

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arunkumar446

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Hi,

techfile (.tf) contains parasitic model & TLUPlus also has this info. Then when does ICC use these files and what difference does it make in using either of these files?
techfile has additional info like tile, DRC rules, color, lines...etc....

Thanks in advance.
 

looks like there is slight confusion here
.tf --> there are 2 techfiles one is often called as milkyway.tf while other is cadence.tf
1. milkyway.tf contains all the metal & via info required for router in ICC.
2. cadence.tf contains DRC rules, color, stream_layers, via & metal info etc. This used for Virtuoso & other cadence tools.

TLUplus VS milkyway.tf
TLUplus -- will contain resistance & cap info about all layer including active , poly , metal layers ets. -- mostly used by parasitic extraction tools
milkyway.tf -- contains info abt via & metal layers only .predominantly required for place & route tools
 
milkyway.tf may also contains parasitic model of wires (as TLUplus files). If you specify in ICC the TLUplus files, then ICC uses TLUplus files (and did not read parasitic info from .tf file). If you did not specify TLUplus, then ICC use parasitic info from milkyway.tf.

The advantage of TLUplus is that is is more accurate (than .tf) and you may have different TLUplus for different RC corners (not PVT corners). And you may specify for ICC different TLUplus for different scenarios. While milkyway.tf contains parasitic info only for one RC corner.
 
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