10.1.2.4 Adder Implementation Rules

The following table lists the implementation rules for an adder.

Table 10-9. Implementation Rules
ParameterFamilyValueDescription
LPMTYPEAllLPM_ADD_SUBAdder category
LPM_HINTProASICPLUS, ProASICSKADDSklansky model
FBKADDFast Brent-Kung model
BKADDCompact Brent-Kung model
ALLFADDAVery fast carry select model
ALLRIPADDARipple carry model
ALLMFADDAFast carry select model
LPMTYPEAxceleratorLPM_FC_ADD_SUBFast carry chain adder category
LPM_HINTFC_FADDFast carry chain select model
LPM_HINTFC_RIPADDFast carry chain ripple carry model
Note: FADD and MFADD are not recommended for ProASIC 3 or ProASICPLUS devices.