參數(shù)資料
型號: PCF5083
廠商: NXP Semiconductors N.V.
英文描述: STEEL COVER
中文描述: GSM信號處理IC
文件頁數(shù): 82/136頁
文件大小: 602K
代理商: PCF5083
1996 Oct 29
82
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.
MP_read_bbd_in_fifo_init
47
buff_id
n_samples
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
.
MP_read_data_frame
58
i_offset
q_offset
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
μ
s for the data frame. If time-out
occurs TIMEOUT_AUDIO_IN_FIFO error message is automatically sent to
the SC.
MP_set_side_tone
76
user_buff_id
framelength
timeout
n_words
n_user_bytes
n_ctrl_bytes
ctrl_bytes[ ]
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.
31
att
DESCRIPTION
ID
PARAMETERS
RETURN
VALUES
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