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參數(shù)資料
| 型號： | PCD5043H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | DECT burst mode controller |
| 中文描述： | TELECOM, CORDLESS, BURST MODE CONTROLLER, PQFP64 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 109K |
| 代理商： | PCD5043H |
1996 Oct 31
10
Philips Semiconductors
Objective specification
DECT burst mode controller
PCD5043
data, these disturbances are not audible (or are less
audible) to the user. The PCD5043 performs two types of
muting:
Fast muting
Slow muting.
Fast muting, which is performed by the PCD5043
automatically, is nothing more than a repetition of the
previously received frame (80 speech samples) to the
ADPCM codec. It is issued if no Sync word was detected.
Slow muting is issued by the microcontroller, after having
detected a degradation of quality. A slow mute is
implemented as a continuous ‘0000’ nibble transmission to
the ADPCM codec, until slow mute is released.
6.4.4
L
OCAL CALL
A local call option is implemented, in order to loopback
data from one codec to another codec, and vice versa, see
Fig.4.
6.5
RF interface
Most of the functions performed by the RF interface are
under control of the PCC. Specifically, the processing of
non-speech data and the programming of functions and
registers is done via the PCC.
handbook, halfpage
MBH710
0
1
speech slots
speech buffer
pair
0
1
DO
0
1
0
1
DI
Fig.4 Local call switching on speech interface.
6.5.1
S
ERIAL RECEIVER
The serial receiver processes the data, which comes from
the RF section, and which is already filtered by the
synchronization part. The data is latched, using the
recovered data clock.
The serial receiver will collect the complete A-field and
B-field and store it in the common data memory. Before the
A-field is received, the A-field start address is programmed
by the PCC. Upon reception of A-field nibbles, the address
is updated by the serial receiver. Meanwhile, the PCC will
program the B-field start address.
In Fig.5 the data flow in the serial receiver is shown. Note
that almost no decoding of messages is required. Only the
header of the A-field needs to be decoded to check if a
ciphered message is being received or transmitted, which
requires the ciphering to be switched on in the A-field also.
6.5.2
S
ERIAL TRANSMITTER
The serial transmitter performs the reverse of the receiver
functions. Several blocks used in the receiver are also
used in the transmitter. Amongst these are the
CRC-generators, the scrambler, and the address
registers. Figure 6 shows the serial transmitter structure.
By transmitting the X-CRC twice, the Z-field is transmitted.
The handling of the address registers is the same for the
transmitter. Transmission of the synchronization sequence
(S-field) is done using the same method as the A-field and
B-field. The S-field is stored in the common data memory
and will be fetched by the transmitter, just before
transmission.
Two additional functions are not shown in Fig.6:
In the handset the data in the serial transmitter may be
advanced by a programmable number of bit periods.
This is done to compensate for the delay in the RF
section
The transmitted data can be inverted (using a switch in
the PCD5043 mode register), in order to connect the
PCD5043 to VCOs requiring negative modulation.
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