Altera Cyclone IV - 18-Bit Multipliers

Chapter 4: Embedded Multipliers in Cyclone IV Devices 4–5
Operational Modes
February 2010 Altera Corporation Cyclone IV Device Handbook,
Volume 1
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.
Figure 4–3. 18-Bit Multiplier Mode
CLRN
DQ
ENA
Data A [17..0]
Data B [17..0]
aclr
clock
ena
signa
signb
CLRN
DQ
ENA
CLRN
DQ
ENA
Data Out [35..0]
18 × 18 Multiplier
Embedded Multiplier