Carry Chain Length logic option

A logic option that specifies the maximum allowable length of a chain of both user-entered and Compiler-synthesized CARRY_SUM buffers. Carry chains that exceed this length are broken into separate chains. (This option also applies to MAX+PLUS^® II-style CARRY buffers.)

This option is ignored if it is assigned to anything other than a design entity. This option is available for All Altera^® devices supported by the Quartus^® II software except MAX^® 3000, MAX 7000AE, and MAX 7000B devices.