RM0020 datasheet(67/69 Pages) STMICROELECTRONICS

67 / 69 page

RM0020

Performance

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Table 57.

iir_float_casc - cascade of second-order IIR filters for float data

N(1)

m(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

256

2461

2339

2338

0.99

256

4799

4649

4640

0.99

256

7084

6936

0.99

N - number of input/output samples, m - number of second-order filters.

Table 58.

iir_frac16_1st - first-order IIR filter for frac16 data

N(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

128

758

703

2.5

1.00

256

1451

1375

2.5

1.00

N - number of input/output samples.

Table 59.

iir_frac16_2nd - second-order IIR filter for frac16 data

N(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

128

890

838

3.3

1.00

256

1719

1638

3.3

1.00

N - number of input/output samples.

Table 60.

iir_frac16_casc - cascade of second-order IIR filters for frac16 data

N(1)

m(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

256

1777

1688

1685

0.99

256

3454

3340

3334

0.99

256

5099

4977

0.99

N - number of input/output samples, m - number of second-order filters.

Table 61.

iir_frac16_2nd_hc - second-order IIR filter for frac16 data with half coefficients

N(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

128

970

919

3.1

1.00

256

1855

1783

3.2

1.00

N - number of input/output samples.

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