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Chapter 4: Embedded Multipliers in the Cyclone III Device Family

Operational Modes

Cyclone III Device Handbook

December 2011

Altera Corporation

Volume 1

1 You can also use embedded multipliers of the Cyclone III device family to implement

multiplier adder and multiplier accumulator functions, in which the multiplier

portion of the function is implemented using embedded multipliers, and the adder or

accumulator function is implemented in logic elements (LEs).

18-Bit Multipliers

You can configure each embedded multiplier to support a single 18 × 18 multiplier for

input widths of 10 to 18 bits.

Figure 4–3 shows the embedded multiplier configured to support an 18-bit multiplier.

All 18-bit multiplier inputs and results are independently sent through registers. The

multiplier inputs can accept signed integers, unsigned integers, or a combination of

both. Also, you can dynamically change the signa and signb signals and send these

signals through dedicated input registers.

9-Bit Multipliers

You can configure each embedded multiplier to support two 9 × 9 independent

multipliers for input widths of up to 9 bits.

Figure 4–3. 18-Bit Multiplier Mode

CLRN

ENA

Data A [17..0]

Data B [17..0]

aclr

clock

ena

signa

signb

CLRN

ENA

CLRN

ENA

Data Out [35..0]

× 18 Multiplier

Embedded Multiplier

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