PCF5083 datasheet(97/136 Pages) PHILIPS

97 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

9.4.4.5

Initialization messages for Handover mode

Table 75 shows how a handover from TCH/FS to another TCH/FS has to be processed. ‘fnH’ is the first frame transmitted

on the new TCH/FS in Handover mode (handover access burst transmitted in uplink). ‘fnS’ is the first frame processed

in normal mode on the new TCH/FS (normal burst in up link).

Table 75 Initialization procedures for handover mode

Notes

1. Procedures to be started via EXEC_PROC in TDMA frame FN (TCH/FS normal mode).

2. t1s =FNs divided by 26 × 51;

t2s =FNs modulo 26;

t3s =FNs modulo 51.

3. The parameter nb determines the number of normal bursts to be written into the modulator output FIFO in the

initialization frame. It depends on the frame number of the 1st processed frame in accordance with Table 71.

PROCEDURES(1)

procedure calls for TCH/FS in normal mode; the correct value for NW must be

looked-up in Table 70.

‘...’

149

156

....

procedure calls for TCH/FS in normal mode; the correct value for NW must be

looked-up in Table 70.

‘...’

149

156

−

149

156

fnH − 2

CP_start_TCHFS (enc_ﬂag, dec_ﬂag, t1s, t2s, t3s, kc[4], nb); notes 2 and 3

MP_exec_reset (MOD_OUT_FIFO);

DB_write_register(11, 0x0100, 1); set IO1 = 1

000

fnH − 1

procedure calls for TCH/FS in handover mode; the correct value for NWmust

be looked-up in Table 70.

‘...’

fnH

procedure calls for TCH/FS in handover mode; the correct value for NW must

be looked-up in Table 70.

‘...’

149

156

procedure calls for TCH/FS in handover mode; the correct value for NW must

be looked-up in Table 70.

‘...’

149

156

fns − 2

procedure calls for TCH/FS in handover mode

BB_normal_burst (SCRATCH_BUFF,SCRATCH_BUFF, tsc,

nb)MP_write_normal_bursts (SCRATCH_BUFF, nb); note 3

149

156

fns − 1

procedure calls for TCH/FS in normal mode; the correct value for NW must be

looked-up in Table 70.

‘...’

149

156

fns

procedure calls for TCH/FS in normal mode; the correct value for NW must be

looked-up in Table 70.

‘...’

149

156

PCF5083 데이터시트(PDF) 97 Page - NXP Semiconductors

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