PCF5083 datasheet(70/136 Pages) PHILIPS

70 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

CM_encoder_RACH

Channel encoder random access channel. The encoded RACH message is

stored in SCRATCH_BUFF.

bsic contains the 6 bits B(0) to B(5) of the base station identity code in

accordance with

“GSM Rec. 05.03”. B(0) is stored in the LSB (bit 0) of bsic,

B(5) in bit 5 of bsic. B(0) = MSB of PLMN colour code, B(5) = LSB of BS

colour code.

rach_msg[1] contains the RACH message consisting out of 8 bits. The bits

are stored in LSB ﬁrst order. Unused MSBs are set to zero.

bsic

rach_msg[1]

−

CM_encoder_TCHDATA

Channel encoder and interleaver for data channels, 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.

DTX is valid only for the encoder for full-rate 9.6 kbits/s and half-rate

4.8 kbits/s.

The facch_ﬂag indications:

facch_ﬂag = 0; indicates that no FACCH data must 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.

For data services other than full-rate 9.6 kbits/s and half-rate 4.8 kbits/s

txen will be set to logic 1.

dtx_ﬂag

facch_ﬂag

facch_msg[12]

txen

CM_encoder_TCHDATA_init

Initialization of CM_ENCODER_TCHDATA. The parameter data_service

may be one of the following values:

data_service = 0; full-rate = 9.6 kbits/s

data_service = 1; full-rate = 4.8 kbits/s

data_service = 2; full-rate

≤ 2.4 kbits/s

data_service = 3; half-rate = 4.8 kbits/s

data_service = 4; half-rate

≤ 2.4 kbits/s.

data_service

−

DESCRIPTION

PARAMETERS

RETURN

VALUES

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