EP3C5M164I7N Datasheet, PDF (59/274 Pages) Altera Corporation – Cyclone III Device Handbook

Chapter 4: Embedded Multipliers in the Cyclone III Device Family
4–7
Operational Modes
Figure 4–4 shows the embedded multiplier configured to support two 9-bit
multipliers.
Figure 4–4. 9-Bit Multiplier Mode
signa
signb
aclr
clock
ena
Data A 0 [8..0]
Data B 0 [8..0]
DQ
ENA
CLRN
DQ
ENA
CLRN
DQ
ENA
CLRN
Data Out 0 [17..0]
9 × 9 Multiplier
Data A 1 [8..0]
Data B 1 [8..0]
DQ
ENA
CLRN
DQ
ENA
CLRN
DQ
ENA
CLRN
Data Out 1 [17..0]
9 × 9 Multiplier
Embedded Multiplier
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.
December 2011 Altera Corporation
Cyclone III Device Handbook
Volume 1