33FJ128GP708 datasheet(51/90 Pages) MICROCHIP

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Preliminary

DS70155C-page 49

dsPIC33F

TABLE 11-4:

FUNCTION EXECUTION TIMES

11.4

dsPICworks™ Data Analysis and

DSP Software

The dsPICworks tool is a free data analysis and signal

processing

package

for

use

with

Microsoft®

Windows® 9x, Windows NT®, Windows 2000 and

Windows XP platforms. It provides an extensive

number of functions encompassing:

• Wide variety of Signal Generators – Sine, Square,

Triangular, Window Functions, Noise

• Extensive DSP Functions – FFT, DCT, Filtering,

Convolution, Interpolation

• Extensive Arithmetic Functions – Algebraic

Expressions, Data Scaling, Clipping, etc.

• 1-D, 2-D and 3-D Displays

• Multiple Data Quantization and Saturation

Options

• Multi-Channel Data Support

• Automatic “Script File”-based Execution Options

available for any user-defined sequence of

dsPICworks Tool Functions

• File Import/Export interoperable with MPLAB IDE

• Digital Filtering Options support Filters generated

by dsPIC DSC Filter Design

• ASM30 Assembler File Option to export Data

Tables into dsPIC33F RAM

FIGURE 11-1:

dsPICworks

™ DATA

ANALYSIS AND DSP

SOFTWARE

Function

Cycle Count

Equation

Conditions(1)

Number of

Cycles(2)

Execution Time @

40 MIPS

Complex FFT(3)

—

N = 64

3739

93.5

μs

Complex FFT(3)

—

N = 128

8485

212.1

μs

Complex FFT(3)

—

N = 256

19055

476.4

μs

Block FIR

53 + N(4 + M)

N = 32, M = 32

1205

30.1

μs

Block FIR Lattice

41 + N(4 + 7M)

N = 32, M = 32

7337

183.4

μs

Block IIR Canonic

36 + N(8 + 7S)

N = 32, S = 4

1188

29.7

μs

Block IIR Lattice

46 + N(16 + 7M)

N = 32, M = 8

2350

58.8

μs

Matrix Add

20 + 3(C * R)

C = 8, R = 8

212

5.3

μs

Matrix Transpose

16 + C(6 + 3(R – 1))

C = 8, R = 8

232

5.8

μs

Vector Dot Product

17 + 3N

N = 32

113

2.8

μs

Vector Max

19 + 7(N – 2)

N = 32

229

5.7

μs

Vector Multiply

17 + 4N

N = 32

145

3.6

μs

Vector Power

16 + 2N

N = 32

2.0

μs

Note 1:

C = # columns, N = # samples, M = # taps, S = # sections, R = # rows.

1 cycle = 25 nanoseconds @ 40 MIPS.

Complex FFT routine inherently prevents overflow.

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