10.1.4.4 Adder/Subtractor Implementation Rules
The following table lists the implementation rules for an Adder/Subtractor.
| Parameter | Family | Value | Description |
|---|---|---|---|
| LPMTYPE | All | LPM_ADD_SUB | Adder category |
| LPM_HINT | ProASICPLUS, ProASIC | SKADDSUB | Sklansky model |
| FBKADDSUB | Fast Brent-Kung model | ||
| BKADDSUB | Compact Brent-Kung model | ||
| ALL | FADDSUBA | Very fast carry select model | |
| ALL | RIPADDSUBA | Ripple carry model | |
| LPMTYPE | Axcelerator | LPM_FC_ADD_SUB | Fast carry chain Adder category |
| LPM_HINT | FC_ADDSUB | Fast carry chain select model | |
| LPM_HINT | FC_RIPADDSUB | Fast carry chain ripple carry model |
Note: FADDSUB and MFADDSUB are not recommended for ProASIC® 3 or ProASICPLUS® devices.