參數(shù)資料
型號(hào): PCF5083
廠商: NXP Semiconductors N.V.
英文描述: STEEL COVER
中文描述: GSM信號(hào)處理IC
文件頁(yè)數(shù): 51/136頁(yè)
文件大?。?/td> 602K
代理商: PCF5083
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1996 Oct 29
51
Philips Semiconductors
Objective specification
GSM signal processing IC
PCF5083
9.1.5.2
Format of downlink data frames
The downlink data frame format is described in Table 40. Each word consists of four fields; these are described in
Table 37.
Table 37
Field descriptions
Table 38
Classification of the 16-bit samples
Table 39
Valid values for FID
Note
1.
Binary value; X = don’t care.
FIELD
DESCRIPTION
DATA
Depending on the contents of the CMD field (see Table 38), this field contains a data byte belonging to a
user or a control data block or auxiliary control information for the terminal adaptor.
This field classifies the 16-bit samples as described in the Table 38.
Synchronization signal for external (test) equipment. Marks the 20 ms speech frames. Each falling edge of
SYNC marks the beginning of a new output speech frame and with a constant offset due to internal
module processing time the rising edge of SYNC marks a new input speech frame. As soon as audio
output data are available this bit always reflects the internal speech frame timing independently of other
processing tasks of the DSP.
This field may be used by external devices to distinguish between audio and data frames. The INFO field
of word#2 contains the so called frame identification (FID); see Table 39.
CMD
SYNC
INFO
CMD FIELD
DESCRIPTION
7
6
5
4
3
0
0
0
0
0
0
0
1
1
0
The data field contains a valid data byte belonging to either a user or a control data block.
The data field contains auxiliary control information that may be used by the terminal
adaptor for synchronization purposes.
Indicates that the data field contains invalid data, which should be ignored.
Reserved for future expansion. Not used by the DSP.
1
1
1
1
1
Other combinations
FID
(1)
FRAME TYPE
00
01
1X
audio frame
data frame
reserved
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