RM0020 datasheet(59/69 Pages) STMICROELECTRONICS

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RM0020

Performance

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mfb50_index

180

conv3x3

672(4)

sobel3x3

492(4)

sobel3x3_horizontal

348(4)

sobel3x3_vertical

352(4)

corr_frac16

440

fir_float

776

fir_frac16

568

iir_float_1st

324

iir_float_2nd

416

iir_float_casc (iir_float_casc_c)

124(5)

iir_frac16_1st

164

iir_frac16_2nd

208

iir_frac16_casc (iir_frac16_casc_c)

124(5)

iir_frac16_2nd_hc

284

N2_REALPART configured to 0, for N2_REALPART configured to 1 code size is 460 bytes.

The code size is the same for N2_REALPART configured to 0 or 1.

Valid for both scaling on and off.

ZERO_LASTCOL configured to 0, if configured to 1 the size is 4 bytes greater for conv3x3 function and 8

bytes greater for the sobel functions.

The iir_float_casc (iir_frac16_casc) function calls function iir_float_2nd (iir_frac16_2nd). The code size in

the table is valid for the CodeWarrior compiler with optimizations set to level 4, Instruction Scheduling and

Peephole Optimization turned on.

Table 31.

Code size (continued)

Function

Code size [bytes]

Table 32.

Radix-4 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

[-]

2546

2274

2259

2.57

0.97

256

12362

11653

11637

2.4

0.98

1024

59917

57374

56911

2.3

0.99

4096

307499

305244

304521

2.1

0.89

The clock cycles include bit reversing by bitrev_table_32bit and FFT computation by fft_radix4_float function. w_table in

internal flash, seed_table in internal flash.

N is FFT length.

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