Embedded Multipliers in Cyclone II Devices
18-Bit Multipliers
Each embedded multiplier can be configured to support a single
18 × 18 multiplier for input widths from 10- to 18-bits. Figure 12–3 shows
the embedded multiplier configured to support an 18-bit multiplier.
Figure 12–3. 18-Bit Multiplier Mode
signa (1)
signb (1)
aclr
clock
ena
D
Q
Data A [17..0]
Data B [17..0]
ENA
Data Out [35..0]
D
Q
CLRN
ENA
CLRN
D
Q
ENA
CLRN
18 × 18 Multiplier
Embedded Multiplier
Note to Figure 12–3:
(1) If necessary, you can send these signals through one register to match the data signal path.
All 18-bit multiplier inputs and results can be independently sent through
registers. The multiplier inputs can accept signed integers, unsigned
integers or a combination of both. Additionally, you can change the
signaand signbsignals dynamically and can send these signals
through dedicated input registers.
9-Bit Multipliers
Each embedded multiplier can also be configured to support two
9 × 9 independent multipliers for input widths up to 9-bits. Figure 12–4
shows the embedded multiplier configured to support two 9-bit
multipliers.
Altera Corporation
February 2007
12–7
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
