RM0020 datasheet(63/69 Pages) STMICROELECTRONICS

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RM0020

Performance

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Table 43.

Complex frac16 windowing function(1)

N(2)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

691

608

602

0.99

128

1291

1162

0.99

256

2502

2282

0.99

512

4910

4522

0.99

1024

9724

9022

9002

0.99

2048

19329

18061

17962

0.99

w vector in internal flash. The table is valid for both scaling on and off.

N is window length.

Table 44.

Real float windowing function(1)

N(2)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

298

188

3.1

0.86

128

524

360

3.1

0.85

256

965

704

3.1

0.84

512

1843

1398

1392

3.1

0.84

1024

3609

2801

2768

3.1

0.84

2048

7159

5658

5520

3.1

0.84

4096

14289

13145

12564

2.8

0.74

w vector in internal flash.

N is window length.

Table 45.

Real frac16 windowing function(1)

N(2)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

264

188

0.86

128

469

360

0.85

256

862

704

0.84

512

1644

1392

0.84

1024

3207

2777

2768

0.84

2048

6365

5540

5520

0.84

4096

12644

11143

11024

0.84

w vector in internal flash.

N is window length.

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