10.1.1.4 Accumulator Implementation Rules

The following table lists the implementation rules for an accumulator.

Table 10-4. Implementation Rules
ParameterFamilyValueDescription
LPMTYPEAllLPM_ADD_SUBAdder category
LPM_HINTProASICPLUS, ProASICSKACCSklansky model
FBKACCFast Brent-Kung model
BKACCCompact Brent-Kung model
ALLMFACCAVery fast carry select model
ALLRIPACCARipple carry model
LPMTYPEAxceleratorLPM_FC_ADD_SUBFast carry chain adder category
LPM_HINTFC_FACCFast carry chain select model
LPM_HINTFC_RIPACCFast carry chain ripple carry model
Note: FACC and MFACC are not recommended for ProASICPLUS® devices.
Table 10-5. Fan-In Control Parameters
ParameterValue
CLR_FANINAUTO MANUAL
CLR_VAL<val> [default value for AUTO is 8, 1 for MANUAL]
EN_FANINAUTO MANUAL
EN_VAL<val> [default value for AUTO is 6, 1 for MANUAL]
CLK_FANINAUTO MANUAL
CLK_VAL<val> [default value for AUTO is 8, 1 for MANUAL]