Low Power V.22 bis Modem
CMX868
Tx Mode Register b2-0: Tx Data and Stop bits (QAM, DPSK, FSK Start-Stop modes)
In Start-stop mode these three bits select the number of Tx data and stop bits.
b2
b1
b0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
8 data bits, 2 stop bits
8 data bits, 1 stop bit
7 data bits, 2 stop bits
7 data bits, 1 stop bit
6 data bits, 2 stop bits
6 data bits, 1 stop bit
5 data bits, 2 stop bits
5 data bits, 1 stop bit
Tx Mode Register b2-0: Tx Data source (QAM, DPSK, FSK Synchronous mode)
In Synchronous mode (b4-3 = 11) these three bits select the source of the data fed to the Tx
FSK or QAM/DPSK scrambler and modulator.
b2
b1
b0
1
0
0
0
x
1
1
0
x
1
0
x
Data bytes from Tx Data Buffer
Continuous 1s
Continuous 0s
Continuous V.22 bis handshake S1 pattern dibits ’00,11’ in DPSK and
QAM modes, continuous alternating 1s and 0s in all other modes.
ã 2004 CML Microsystems Plc
24
D/868/9
CMLMICRO [ CML MICROCIRCUITS ]
