PCF5083HSLASH5V2SLASHF3 datasheet(71/136 Pages) PHILIPS

71 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

CM_encoder_TCHFS

Channel encoder and interleaver for trafﬁc channel full-rate speech and

FACCH and DTX uplink control.

The dtx_ﬂag determines whether discontinuous transmission (DTX) is

applied:

dtx_ﬂag = 1; DTX is applied

dtx_ﬂag = 0; DTX is not applied.

The taf determines whether the current trafﬁc frame is aligned with the

SACCH multiframe structure as described in

“GSM Rec. 05.08”:

taf = 0; not aligned with SACCH multiframe structure

taf = 1; aligned with SACCH multiframe structure.

The facch_ﬂag indications:

facch_ﬂag = 0; indicates that no FACCH message need be encoded

facch_ﬂag = 1; indicates that a FACCH message must be encoded.

The facch_msg[12] contains the 184 bits of the FACCH message. The bits

are stored in a packed format with 16-bits per word and LSB ﬁrst order.

The return value txen is only useful if DTX is applied. It indicates whether

the TCH block will be transmitted over the air interface.

txen = 1; TCH block will be transmitted over the air interface

txen = 0; TCH block will not be transmitted over the air interface.

dtx_ﬂag

taf

facch_ﬂag

facch_msg[12]

txen

CM_encoder_TCHFS_init

Initialization of CM_encoder_TCHFS.

−−

CP_audio_loop

Combination of:

MP_READ_AUDIO_IN_FIFO (SCRATCH_BUFF, 160,

−1);

MP_WRITE_AUDIO_OUT_FIFO (SCRATCH_BUFF, 160).

−−

CP_freq_estim

Combination of:

MP_READ_BBD_IN_FIFO (IQ_BUFF, 167);

FB_FREQ_ESTIM (threshold)

The fb_freq_estim processes 156 I and Q samples only. 167 samples are

read in order to minimize the number of different burst length

threshold

fb_qual

fb_foi

CP_freq_estim_offset (PCF5083-3)

Combination of:

MP_READ_BBD_IN_FIFO_INIT (i_offset, q_offset);

MP_READ_BBD_IN_INFO (IQ_BUFF, 167);

FB_FREQ_ESTIM (threshold).

threshold

i_offset

q_offset

fb_qual

fb_foi

DESCRIPTION

PARAMETERS

RETURN

VALUES

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