EP3C5 datasheet(59/274 Pages) ALTERA

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Chapter 4: Embedded Multipliers in the Cyclone III Device Family

4–7

Operational Modes

December 2011

Altera Corporation

Cyclone III Device Handbook

Volume 1

Figure 4–4 shows the embedded multiplier configured to support two 9-bit

multipliers.

All 9-bit multiplier inputs and results are independently sent through registers. The

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

both. Two 9 × 9 multipliers in the same embedded multiplier block share the same

signa

and signb signal. Therefore, all the Data A inputs feeding the same embedded

multiplier must have the same sign representation. Similarly, all the Data B inputs

feeding the same embedded multiplier must have the same sign representation.

Figure 4–4. 9-Bit Multiplier Mode

CLRN

ENA

Data A 0 [8..0]

Data B 0 [8..0]

aclr

clock

ena

signa

signb

CLRN

ENA

CLRN

ENA

Data Out 0 [17..0]

× 9 Multiplier

Embedded Multiplier

CLRN

ENA

Data A 1 [8..0]

Data B 1 [8..0]

CLRN

ENA

CLRN

ENA

Data Out 1 [17..0]

× 9 Multiplier

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