EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 95

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Operational
Modes
Altera Corporation-Preliminary
March 2007
f
All input and output registers within a single embedded multiplier are
fed by the same clock, clock enable, and asynchronous clear signals.
Refer to the MultiTrack Interconnect in Cyclone III Devices chapter in
volume 1 of the Cyclone III Device Handbook for more information on
embedded multiplier routing and interface.
You can use an embedded multiplier block in one of two operational
modes, depending on the application needs:
■
■
The Quartus II software includes megafunctions used to control the
operational modes of the multipliers. After you have made the
appropriate parameter settings using the megafunction's MegaWizard
Plug-In Manager, the Quartus II software automatically configures the
embedded multiplier.
1
For more information about Quartus II support for Cyclone III embedded
multipliers, refer to
18-Bit Multipliers
You can configure each embedded multiplier to support a single 18 x 18
multiplier for input widths of 10 to 18 bits.
embedded multiplier configured to support an 18-bit multiplier.
One 18-bit multiplier
Up to two 9-bit independent multipliers
You can also use the Cyclone III embedded multipliers to
implement multiplier adder and multiplier accumulator
functions where the multiplier portion of the function is
implemented using embedded multipliers and the adder or
accumulator function is implemented in logic elements (LEs).
“Software Support” on page
Cyclone III Device Handbook, Volume 1
Figure 5–3
5–10.
shows the
Operational Modes
5–7
®