18-Bit Multipliers - Altera Cyclone IV Device Handbook

Chapter 4: Embedded Multipliers in Cyclone IV Devices
Operational Modes

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
Figure 4–3. 18-Bit Multiplier Mode
Data A [17..0]
Data B [17..0]
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.
February 2010 Altera Corporation
shows the embedded multiplier configured to support an 18-bit multiplier.
signa
signb
aclr
clock
ena
D Q
ENA
CLRN
D Q
ENA
CLRN
Data Out [35..0]
D Q
ENA
CLRN
18 × 18 Multiplier
Embedded Multiplier
4–5
Cyclone IV Device Handbook,
Volume 1