Auto Carry Chains logic option

A logic option that allows the Compiler to create carry chains automatically by inserting CARRY_SUM buffers into the design. This option is also required to recognize carry chains in any design containing MAX+PLUS II-style CARRY buffers. The length of the chains is controlled with the Carry Chain Length option. If this option is turned off, CARRY buffers are ignored, but CARRY_SUM buffers are unaffected.

This option must be assigned to a design entity or it is ignored. This option is available for All Intel devices except MAX3000 and MAX7000 devices.