Hardware interfaces
Version 8 dated 15.03.00 22
Siemens Information and Communication Products
A
Signal description on the 9-pole D-sub DCE connector:
Signal connection 9-pole D-sub DCE to M20 80-pole SMD connector:
4.3.6 Additional RX/TX interface
This interface is reserved for Siemens development internal purposes.
4.3.7 Voiceband serial ports/digital audio interface (DAI)
To provide a digital audio interface to the user and to offer high-end echo suppression in handsfree environments as an
upgrade feature, the on-board voiceband serial connector between the M20 microcontroller and codec (A/D device) is con-
nected to the 80-pole SMD connector.
Note
: the data exchanged on the interface involves 13 bit linear PCM at 8000 samples per second.
Note
: in normal cases, the voiceband serial ports (to microcontroller and to codec) have to be interconnected on the PCB
of the base unit.
If using the DAI, connection to the codec-oriented ports is not necessary.
For handsfree applications, see detailed information in Chapter
8.8.5 “Adding echo suppression functionality” on page 200.
9-pole D-Sub
DCE Pin No
Description Function CCITT
V-24
EIA
RS232
DIN
66020
I/O DCE to
DTE
1 DCD Data Carrier Detect 109 CF M5 O
2 RXD Receive Data 104 BB D2 O
3 TXD Transmit Data 103 BA D1 I
4 DTR Data Terminal Ready 108 CD S1 I
5 GND Ground 102 AB E2
6 DSR Data set ready 107 CC M1 O
7 RTS Request to send 105 CA S2 I
8 CTS Clear to send 106 CB M2 O
9 RI Ring Indication 125 CE M3 O
DCE Pin No DCE Signal M20 Signal M20 Pin No
1 DCD DCD 54
2 RXD USCTX 72
3 TXD USCRX 10
4 DTR DSR 26
5 GND
6 DSR DTR 16
7 RTS USCCTS 9
8 CTS USCRTS 73
9 RI USCRI 11
Signal Function I/O Level Comments
RXDATA Receive data I 2.8 V if unused, connect to signal RES#
TXDATA Transmit data O 2.8 V may be disconnected if unused
Signal Function I/O Level Comments
VSFS_C Synchronisation I 2.8V to microcontroller (in normal cases, to be connected to VSFS_V)
VSCLK_C Clock I 2.8V to microcontroller (in normal cases, to be connected to VSCLK_V)
VSDO_C Data output O 2.8V to microcontroller (in normal cases, to be connected to VSDI_V)
VSDI_C Data Input I 2.8V to microcontroller (in normal cases, to be connected to VSDO_V)
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