10.1.14.5 Fast Carry Chains (Axcelerator only)

The Axcelerator Family offers fast-carry-chain cores for a compact design of Arithmetic Macros and Counters. Fast-Carry cores for Axcelerator are available in the Variations list.

You can generate FC cores using the module generator or infer them with synthesis tools like Synplify Pro. FC cores are the most area-efficient way to implement these modules. They also offer superior performance for designs up to 32 bits, although some modules may be inferior beyond 32 bits (incrementers, for example). Though the software offers both architecture types (FC cores and non-FC cores), Microchip recommends using FC cores to guarantee area efficiency.

In the Core Catalog, you can distinguish the FC cores from non-FC cores by the prefix “FC” or "Fast Carry" (for example, “FC High Speed” versus “High Speed”).