RM0020 datasheet(60/69 Pages) STMICROELECTRONICS

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Performance

RM0020

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Table 33.

Quad radix-2 complex to complex float in-place FFT(1)

N(2)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

2683

2421

2415

2.2

0.96

256

12843

12196

12173

2.1

0.98

1024

62713

60186

60075

2.0

0.99

4096

320423

316501

316011

1.9

0.90

The clock cycles include bit reversing by bitrev_table_32bit and FFT computation by fft_quad_float function. w_table in

internal flash, seed_table in internal flash.

N is FFT length.

Table 34.

Radix-2 complex to complex float in-place FFT(1)

N(2)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

128

6197

5749

5739

2.1

0.98

512

29801

28519

28473

2.1

0.99

2048

144575

138638

137365

2.0

0.99

The clock cycles include bit reversing by bitrev_table_32bit and FFT computation by fft_quad_float function and

fft_radix2_last_stage_float function. w_table in internal flash, seed_table in internal flash.

N is FFT length.

Table 35.

Radix-4 complex to complex frac16/frac32 in-place FFT, scaling on(1)

N(2)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

2746

2480

2474

0.97

256

13411

12773

12740

0.98

1024

65051

62715

62334

0.99

4096

326464

324470

324053

0.91

The clock cycles include bit reversing by bitrev_table_16bit and FFT computation by fft_radix4_frac32 function. w_table in

internal flash, seed_table in internal flash.

N is FFT length.

Table 36.

Quad radix-2 complex to complex frac16/frac32 in-place FFT, scaling on(1)

N(2)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

2901

2627

2620

0.97

256

13913

13234

0.98

1024

67669

65418

65328

0.99

4096

340105

337619

337101

0.92

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