73K224L
V.22bis, V.22, V.21, Bell 212A, 103
Single-Chip Modem
DATA SHEET
CONTROL REGISTER 0 (continued)
D7
D6
D5
D4
D3
D2
D1
D0
CR0
000
MODUL. MODUL.
OPTION
MODUL.
TYPE 0
TRANSMIT
MODE 2
TRANSMIT
MODE 1
TRANSMIT
MODE 0
TRANSMIT
ENABLE
ANSWER/
ORIGINATE
TYPE 1
BIT NO.
NAME
CONDITION
DESCRIPTION
D7
Modulation
Option
0
QAM selects 2400 bit/s. DPSK selects 1200 bit/s.
FSK selects 103 mode.
1
DPSK selects 600 bit/s.
FSK selects V.21 mode.
CONTROL REGISTER 1
D7
D6
D5
D4
D3
D2
D1
D0
TRANSMIT
PATTERN
1
TRANSMIT
PATTERN
0
ENABLE
DETECT
INT.
BYPASS
SCRAMB
CLK
CONTROL
RESET
TEST
MODE 1
TEST
MODE 0
CR1
001
BIT NO.
NAME
CONDITION
DESCRIPTION
D1 D0
D1, D0
Test Mode
Selects normal operating mode.
0
0
0
1
Analog loopback mode. Loops the transmitted analog
signal back to the receiver, and causes the receiver to use
the same carrier frequency as the transmitter. To squelch
the TXA pin, TRANSMIT ENABLE bit as well as Tone Reg
bit D2 must be low.
1
1
0
1
Selects remote digital loopback. Received data is looped
back to transmit data internally, and RXD is forced to a
mark. Data on TXD is ignored.
Selects local digital loopback. Internally loops TXD back to
RXD and continues to transmit data carrier at TXA pin.
D2
D3
Reset
0
1
Selects normal operation.
Resets modem to power down state. All control register bits
(CR0, CR1, CR2, CR3 and Tone) are reset to zero except
CR3 bit D2. The output of the clock pin will be set to the
crystal frequency.
Clock Control
0
1
Selects 11.0592 MHz crystal echo output at CLK pin.
Selects 16 X the data rate, output at CLK pin in DPSK/QAM
modes only.
Page: 9 of 31
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
