EP4CE30F29C7N Datasheet, PDF (55/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1

February 2010
CYIV-51004-1.1
CYIV-51004-1.1
4. Embedded Multipliers in
Cyclone IV Devices
Cyclone^® IV devices include a combination of on-chip resources and external
interfaces that help increase performance, reduce system cost, and lower the power
consumption of digital signal processing (DSP) systems. Cyclone IV devices, either
alone or as DSP device co-processors, are used to improve price-to-performance ratios
of DSP systems. Particular focus is placed on optimizing Cyclone IV devices for
applications that benefit from an abundance of parallel processing resources, which
include video and image processing, intermediate frequency (IF) modems used in
wireless communications systems, and multi-channel communications and video
systems.
This chapter contains the following sections:
■ “Embedded Multiplier Block Overview” on page 4–1
■ “Architecture” on page 4–2
■ “Operational Modes” on page 4–4
Embedded Multiplier Block Overview
Figure 4–1 shows one of the embedded multiplier columns with the surrounding logic
array blocks (LABs). The embedded multiplier is configured as either one 18 × 18
multiplier or two 9 × 9 multipliers. For multiplications greater than 18 × 18, the
Quartus^® II software cascades multiple embedded multiplier blocks together. There
are no restrictions on the data width of the multiplier, but the greater the data width,
the slower the multiplication process.
Figure 4–1. Embedded Multipliers Arranged in Columns with Adjacent LABs
Embedded
Multiplier
Column
1 LAB
Row
Embedded
Multiplier
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Cyclone IV Device Handbook,
Volume 1
February 2010
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