What is nxtgrd file?

nxtgrd - file containing the modeled layers of a circuit. foundry technology files for input. This library is linked to the technology file (physical rules) and the standard cells. You use an SDC file to communicate the design intent, including.

itf:

interconnect technology format file ；找foundary 要

tlu+:

table look up plus for ICC & Astro

nxtgrd:(nxtgrd which consists of capacitance models)

star-rc need *.map file ;provide the mapping file in which design layers mapped to process layers.

2.

itf-->tlu+

grdgenxo -itf2TLUPlus -i *.ift  -o *.tlu+ //tlu+ 很快

itf-->nxtgrd:

grdgenxo *.itf //得到nxgrd 但很慢

3.

tlup 和 nxgrd 是半可读的

4.

nxtgrd不能直接转成tlu+，但是你打开nxtgrd里面的内容看看，前面的部分其实就是itf的内容，你把那些内容copy下来，就可以用itf转tlu+

5.

rc 参数抽取信息，就是itf的信息，然后做2D,3D抽取参数

说明哪层metal和哪层metal之间有多少RC寄生参数