5CSXC4 datasheet(19/74 Pages) ALTERA

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Chapter 1: Overview for Cyclone V Device Family

1–13

Variable-Precision DSP Block

February 2012

Altera Corporation

Cyclone V Device Handbook

Volume 1: Device Overview and Datasheet

Variable-Precision DSP Block

Cyclone V devices feature a variable-precision DSP block that you can configure to

support signal processing with precisions ranging from 9 x 9, 18 x 19, and 27 x 27 bits

natively.

You can configure each DSP block during compilation as independent three 9 x 9, two

18 x 19, or one 27 x 27 multipliers. With a dedicated 64-bit cascade bus, you can

cascade multiple variable-precision DSP blocks to implement even higher precision

DSP functions efficiently.

The variable-precision DSP block also supports these features:

■

A 64-bit accumulator that is the largest in the industry.

■

A hard preadder that is available in both 18- and 27-bit modes.

■

Cascaded output adders for efficient systolic finite impulse response (FIR) filters.

■

Internal coefficient register banks, 8 deep, for each multiplier in 18- or 27-bit mode.

■

Fully independent multiplier operation.

■

A second accumulator feedback register to accommodate complex

multiply-accumulate functions.

■

Efficient support for single- and double-precision floating point arithmetic.

■

The inferability of all modes by the Quartus® II design software.

Table 1–11 lists the relevant DSP block configurations for a few usage examples.

Table 1–12 lists the variable-precision DSP resources by bit precision for each

Cyclone V device.

Table 1–11. Variable-Precision DSP Block Configurations for Cyclone V Devices

Usage

Multiplier Size (Bit)

DSP Block Resource

Low precision fixed point for video applications

Three 9 x 9

1 variable-precision DSP block

Medium precision fixed point in FIR filters

Two 18 x 19

1 variable-precision DSP block

FIR filters and general DSP usage

Two 18 x 19 with accumulate

1 variable-precision DSP block

High precision fixed- or floating-point implementations

One 27 x 27 with accumulate

1 variable-precision DSP block

Table 1–12. Number of Multipliers in Cyclone V Devices (Part 1 of 2)

Variant

Device

Variable-

precision

DSP Block

Independent Input and Output

Multiplications Operator

18 x 19

Multiplier

Adder Mode

18 x 18

Multiplier

Adder

Summed

with 36-bit

Input

9x 9

Multiplier

18 x 19

Multiplier

27 x 27

Multiplier

Cyclone V E

5CEA2

75502525

5CEA4

216

144

5CEA5

124

372

248

124

5CEA7

156

468

312

156

5CEA9

342

1,026

684

342

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