PCF5083HSLASH001SLASHF2 datasheet(90/136 Pages) PHILIPS

90 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

9.4

Software applications

This section contains examples for several basic GSM

channels. For every example the procedures to be

executed within the DSP are shown in the form of tables.

The first column contains the TDMA frame number fn in

which the EXEC_PROC messages should be sent to the

DSP. The 2nd column shows the corresponding

procedures with all parameters. Parameters in uppercase

are constants, lowercase parameters are variables. The

3rd column contains the number words NW to be

transmitted to the DSP within frame fn (PACKET message

assumed). The columns RX and MX contain the number of

I and Q pairs to be sampled in the receive and monitoring

timeslots of TDMA frame fn. Column TX contains the

number of bits to sent to the GMSK modulator within the

transmit timeslot. The tables are based upon the general

rule that an EXEC_PROC message for a procedure that

starts execution in TDMA frame n has to be sent in TDMA

frame N

− 1.

Unless otherwise noted, the corresponding

PROC_RETURN message will be available at the latest at

the end of TDMA frame N+1, i.e. if the messages are read

by the SC at beginning of every TDMA frame, the

PROC_RETURN message will be available in frame

N + 2. Start and end of a TDMA frame are defined by the

falling edge of the FRAME_INT signal produced by the

timer core.

9.4.1

RECEIVING A CCH BLOCK

Table 67 shows how to receive a CCH block and to

perform monitoring of two neighbouring cells in parallel. It

is assumed that the CCH block has to be received in the

frames N to N + 3. Note that the TX timeslot is used for

monitoring in this example.

Table 67 Procedures to be started for receiving a CCH block

Note

1. Procedures to be started via EXEC_PROC in TDMA frame FN.

PROCEDURES(1)

− 1

CP_rx_normal_burst (CCH_CMI_BUFF1, tsc, agc_gain1);

CP_power_measure (agc_gain2)

CP_power_measure (agc_gain3)

−−−

CP_rx_normal_burst (CCH_CMI_BUFF2, tsc, agc_gain1);

CP_power_measure (agc_gain2)

CP_power_measure (agc_gain3)

149

N + 1

CP_rx_normal_burst (CCH_CMI_BUFF3, tsc, agc_gain1);

CP_power_measure (agc_gain2)

CP_power_measure (agc_gain3)

149

N + 2

CP_rx_normal_burst (CCH_CMI_BUFF4, tsc, agc_gain1);

CM_decoder_CCH( );

CP_power_measure (agc_gain2)

CP_power_measure (agc_gain3)

149

N+3

−−

149

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