"Weng Tianxiang" <wtxwtx@gmail.com> wrote in message news:1189440832.554409.102540@g4g2000hsf.googlegroups.com... > Hi, > I want to know what is called carry chain structure in FPGA is called > in IC? > > Thank you. > > Weng Logic? Depending on the library, you may have carry look-ahead structures implemented or other optimized structures. It ends up as logic but with ASIC specific implementation brought on by the library optimizations.