PCF5083HSLASH5V2SLASHF3 datasheet(82/136 Pages) PHILIPS

82 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

MP_read_bbd_in_ﬁfo

ABS(n_samples) I and Q pairs are copied from the baseband digitizer

(BBD) input FIFO to the buffer determined by buff_id located in the DSP

data RAM. If n_samples is greater than zero the de-rotating and offset

compensation is performed while copying. Otherwise no further processing

is performed. The procedure waits until the FIFO contains sufﬁcient data. In

the event of time_out occurring (10 ms), an ERROR message is sent to the

SC.

buff_id

n_samples

−

MP_read_bbd_in_ﬁfo_init

Initialization of MP_read_bbd_in_ﬁfo. The offset values i_offset and

q_offset are subtracted from the I and Q components during succeeding

calls of MP_read_bbd_in_ﬁfo.

i_offset

q_offset

−

MP_read_data_frame

This procedure reads an uplink data frame consisting of framelength

(typically 160) words from the audio input FIFO. The format of the uplink

data frame is described in Section 9.1.5.3. The user data block is extracted

and copied to SCRATCH_BUFF.

If the control data block is not empty, the procedure returns the packed

control bytes to the SC. The packing method used is most signiﬁcant bytes

ﬁrst (big endian, 68000 compatible).

The procedure waits for timeout

× 100 µs for the data frame. If time-out

occurs TIMEOUT_AUDIO_IN_FIFO error message is automatically sent to

the SC.

user_buff_id

framelength

timeout

n_words

n_user_bytes

n_ctrl_bytes

ctrl_bytes[ ]

MP_set_side_tone

The DSP automatically adds the attenuated microphone input signal to the

loudspeaker output signal, whereby the 3 LSBs remain unchanged (see

Section 9.1.4). The attenuation to be used is described in Table 61.

att

−

DESCRIPTION

PARAMETERS

RETURN

VALUES

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