EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 98

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

Embedded Multipliers in Cyclone III Devices
Software
Support
5–10
Cyclone III Device Handbook, Volume 1
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Altera provides two methods for implementing multipliers in your
design using embedded multiplier resources: instantiation and inference.
Both methods use the following four Quartus II megafunctions:
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In the first method, you can use the lpm_mult, altmult_add, and
altfp_mult megafunctions to implement multipliers. Additionally, you
can use the altmult_add megafunction as multiplier-adders where
embedded multipliers are used as multiply function and LEs configured
as adders.
The altfp_mult megafunction is a floating point multiplier. It
implements the embedded multiplier for floating point numbers
multiplication.
The altmult_accum megafunction implements multiply accumulate
functions where the embedded multiplier implements the multiplier and
the accumulator function is implemented in LEs.
Refer to the Quartus II On-Line Help for instructions on using the
megafunctions and the MegaWizard Plug-In Manager.
In the second method, you can infer the megafunctions by creating an
HDL design and synthesizing it using Quartus II Native Synthesis, or a
third-party synthesis tool such as Cadence or Synplify, which recognizes
and infers the appropriate multiplier megafunction. With both options,
the Quartus II software maps the multiplier functionality to the
embedded multipliers during compilation.
For information on our complete DSP Design and Intellectual Property
offerings, refer to the Altera web site (www.altera.com).
Refer to the Synthesis section in volume 1 of the Quartus II Handbook for
more information.
lpm_mult
altmult_add
altmult_accum
altfp_mult
Altera Corporation-Preliminary
March 2007