PCF5083 datasheet(83/136 Pages) PHILIPS

83 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

MP_write_audio_out_ﬁfo

The n_words located in buffer buff_id are copied from the DSP data

memory into the audio output FIFO. This FIFO collects the samples that

have to be sent to the DAC.

If the FIFO is not empty enough to receive all samples an ERROR

message is sent to the SC.

buff_id

n_words

−

MP_write_data_frame

This procedure generates an output data frame of framelength words

(typical 160) as described in Section 9.1.5.2 and writes it into the audio

output FIFO. All n_ctrl_bytes control data bytes are unpacked and written to

the control data block. If no control bytes are available, only the control data

header is transmitted. The channel decoder output data located in buffer

user_buff_id are written to the user data block.

If the audio output FIFO is not empty enough for framelength samples, an

ERROR message is automatically sent to the SC (AUDIO_FIFO_FULL).

user_buff_id

framelength

n_ctrl_bytes

ctrl_bytes[ ]

−

MP_write_mod_out_ﬁfo

The n_words located in buffer buff_id are copied to the modulator output

FIFO. This FIFO collects the samples that have to be transmitted to the

GMSK modulator.

If the FIFO is not empty enough to receive all samples an ERROR

message is automatically sent to the SC.

buff_id

n_words

−

MP_write_normal_bursts

The n_bursts normal bursts located in buffer buff_id are copied to the

modulator output FIFO.

If the FIFO is not empty enough to receive all samples an ERROR

message is automatically sent to the SC.

buff_id

n_burst

−

DESCRIPTION

PARAMETERS

RETURN

VALUES

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