10.1.28.3 Multiplier Parameter Description

The following table describes all the parameters of a Multiplier.

Table 10-112. Parameter Description
Parameter	Family	Value	Function
WIDTHA A	ProASICPLUS, Axcelerator	2–64	Word length of DataA
	eX	2-14
	Other	2-30
WIDTHB	Same as WIDTHA		Word length of DataB
REPRESENTATION	—	UNSIGNEDSIGNED	Data representation
FFTYPE B	ALL except Flash	REGULARTMR CC	FF Type Used (Default, Triple Voting, Combinatorial)
CLK_EDGE	—	RISE FALL	Clock (if pipelined)

For some of the multiplier variations there are small deviations from the limits mentioned to ensure that the multiplier fits in the largest device of the selected family.
Triple Module Redundancy (TMR): Choosing this option makes the core configurator software use TMR Flip-Flops, which are used to avoid Single Event Upsets (SEUs) for Rad-hard Designs. Choosing this option causes the Sequential resource usage to be tripled in families where no TMR is implemented in silicon.
CC: When combinatorial option is chosen as Sequential Type, the FF is implemented using two Combinatorial Cells instead of one Sequential Cell. This is useful when no Sequential resources are available in the designs.

This option is applicable only to the pipelined multipliers.

The most important parameter rules are shown in the following table; additional rules may apply.

Table 10-113. Parameter Rules
Family	Variation	Parameter rules
All	All	WIDTHA Š WIDTHB
eX	BOOTHMULT/P	WIDTHA + WIDTHB ≤ 15 (signed) / 16 (unsigned)
	BOOTHMULTP	For TMR restrictions for WIDTHA, WIDTHB
	BOOTHMULT2	WIDTHA + WIDTHB ≤ 17 (signed) / 18 (unsigned)
SX/SX-A	BOOTHMULT/P	WIDTHA + WIDTHB ≤ 32
SX/SX-A	BOOTHMULT2	WIDTHA + WIDTHB ≤ 55
Axcelerator	ARRAYMULT	WIDTHA + WIDTHB ≤ 128
	PARRAYMULT	WIDTHA + WIDTHB ≤ 128
	FC_BOOTHMULT1	WIDTHA + WIDTHB ≤ 106
	FC_BOOTHMULT1	WIDTHA + WIDTHB ≤ 106
500K, PA	All	WIDTHA + WIDTHB ≤ 106
Other	All	WIDTHA + WIDTHB ≤ 32