PCF5083HSLASHF2 datasheet(86/136 Pages) PHILIPS

86 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

Notes

1. The on-chip firmware does not include the basic ciphering algorithms A5/1 and A5/2, which produce BLOCK1 and

BLOCK2 in accordance with

“GSM recommendation 3.20”. Therefore the firmware only works correctly, if encryption

and decryption is switched-off. If ciphering is required, a corresponding software module must be downloaded into

the on-chip program RAM. More information will be made available with application notes.

TG_tone_gen_init

This routine initialises TG_tone_gen. The parameters start_att_inc_factor

and start_att_factor indicate how the sine wave starts. Frequency, decay

and amplitude factor for each oscillation are set. If one of the sine values is

zero the state variables of this oscillation are not set. This can be used to

change parameters of the oscillation during tone generation.

The input signal is multiplied with the factor ampl_input. The ampl_input is

represented in 16-bit ﬁxed-point arithmetic with 14 fractional bits (0X4000

corresponds to 1.0).

The parameter start_att is the factor for starting the generated tone softly.

Each sample of the generated tone signal is multiplied by start_att. The

start_att is multiplied by start_att_inc every sample. Both start_att and

start_att_inc are represented in 16-bit ﬁxed-point arithmetic with

14 fractional bits (0X4000 corresponds to 1.0).

The parameter start_att_inc is the factor for increment of the

start_att_factor and is speciﬁed below:

0X4000: start_att_factor is not changed

0X4001 to 0X7FFF: start_att_factor is incremented

0X0000 to 0X3FFF: start_att_factor is decremented.

If start_att_inc_factor

× start_att_factor is not greater than

start_att_factor + 0.5 there is no increment because of rounding.

cos_omega_1, cos_omega_2, cos_omega_3 = 32768 cos(

Ω) is the value

to determine the oscillation frequency of the Nth sinus oscillation

Ω =2 × D × f/fs, where f is the frequency of the oscillation, fs is the sampling

frequency.

sin_omega_1, sin_omega_2, sin_omega_3 = 32768 sin(

Ω) is the value to

determine the amplitude of the oscillation.

decay_N = r is the value to determine the decay of the sinus oscillation (r is

the pole radius of the generating ﬁlter):

0X4000: no decay

0X0001 to 0X3FFF: decay

0X4001 to 0X7FFF: not stable.

ampl_sin_1, ampl_sin_2, ampl_sin_3 are the values to determine the

amplitude of the sine oscillation.

ampl_input

start_att

start_att_inc

cos_omega_1

sin_omega_1

decay_1

ampl_1

cos_omega_2

sin_omega_2

decay_2

ampl_2

cos_omega_3

sin_omega_3

decay_3

ampl_3

−

TG_tone_gen_off

This procedures switches off the tone generation. To restart tone

generation TG_tone_gen_init has to be called again.

−−

DESCRIPTION

PARAMETERS

RETURN

VALUES

PCF5083H/F2 数据表(PDF) 86 Page - NXP Semiconductors

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