PCF5083HSLASHF2 datasheet(95/136 Pages) PHILIPS

95 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

9.4.4.2

Loop-back mode

During TCH_LOOP mode the CP_TX_SPEECH and

CP_RX_SPEECH procedures have to be replaced by the

following procedures:

• Replacement for CP_tx_speech:

MP_read_audio_in_fifo (SCRATCH_BUFF, 160)

DB_copy_buffer (TCH_LOOP_BUFF,

SCRATCH_BUFF, 0, 0, 82)

CM_convert_tchfs_data(bfi_sig_flag)

CM_encoder_tchfs(dtx_flag, taf, facch_flag,

facch_msg[12])

CP_tx_four_normal_bursts (tsc)

• Replacement for CP_rx_speech:

CM_decoder_tchfs( )

DB_copy_buffer(SCRATCH_BUFF,

TCH_LOOP_BUFF, 0, 0, 82)

DB_fill_buffer(SCRATCH_BUFF, 0, 0, 160)

MP_write_audio_out_fifo(SCRATCH_BUFF, 160).

9.4.4.3

Initialization messages for normal mode

Before the first TDMA frame of a TCH/FS can be

processed, several initialization messages have to be sent

to the DSP. Initialization is done in 2 DMA frames as

shown in Table 72.

The first one or two results of CM_decoder_TCH are

based on only partially observed input data, since

8 successive normal bursts are needed due to

interleaving.

Table 71 Parameter nb

t2s

−

12162024

−

611

−−−−−−

Table 72 Initialization messages

Table 73 Initialization procedures

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.

TDMA

FRAME

EXPLANATION

FNs − 2

In this TDMA frame the message for initialization of speech CODEC, channel CODEC and ciphering are

sent to the DSP. Furthermore the modulator out FIFO is ﬁlled with the proper number of bursts and

synchronization between TDMA frame timing and speech frame timing is performed and the audio

interface is enabled by setting the IO1 pin. No data is received or transmitted within this frame.

FNs − 1

In this TDMA frame the EXEC_PROC messages for the procedures processing the data of frame FNs

are sent to the DSP. No data is received or transmitted within this frame.

FNs

In this TDMA frame the normal processing of receive and transmit data takes place.

PROCEDURES(1)

FNs − 2

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

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

000

FNs − 1

The correct value for NW must be looked-up in Table 70

‘...’

FNs

The correct value for NW must be looked up in Table 70

‘...’

149

164

151

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