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 must be assigned to a design entity or it is ignored. This option is available for all Altera devices except MAX3000, and MAX7000 devices.
Scripting Information |
Keyword: carry_chain_length Settings:<integer> default = 48 Keyword: stratix_carry_chain_length stratixii_carry_chain_length Settings:<integer> default = 70 |