73K224L
V.22bis, V.22, V.21, Bell 212A, 103
Single-Chip Modem
DATA SHEET
TONE REGISTER (continued)
D7
D6
D5
D4
D3
D2
D1
D0
RXD
OUTPUT
CONTR.
TRANSMIT
GUARD
TONE
TRANSMIT
ANSWER
TONE
TRANSMIT
DTMF
DTMF 3
DTMF 2/4
WIRE FDX
DTMF 1/
EXTENDED
OVER- SPEED
DTMF 0/
ANSWER/
GUARD
TR
011
BIT NO.
NAME
CONDITION
DESCRIPTION
D5 D4 D0
D5 interacts with bits D4 and D0 as shown. Also interacts
with DR bit D2 in originate mode. See Detect Register
description.
D5
Transmit
Answer Tone
0
1
0
0
X
0
Disables answer tone generator.
In answer mode, a Bell 2225 Hz tone is transmitted
continuously when the Transmit Enable bit is set.
1
0
0
1
1
Likewise, a CCITT 2100 Hz answer tone is transmitted.
Disables guard tone generator.
D6
D7
Transmit
Guard Tone
Enables guard tone generator. (See D0 for selection of
guard tones.) Bit D4 must be zero.
RXD Output
Control
0
1
Enables RXD pin. Receive data will be output on RXD.
Disables RXD pin. The RXD pin reverts to a high
impedance with internal weak pull-up resistor.
CONTROL REGISTER 2
D7
D6
D5
D4
D3
D2
D1
D0
CR2
100
0
SPEC REG CALL INIT
ACCESS
TRANSMIT
S1
16 WAY
RESET
DSP
TRAIN
INHIBIT
EQUALIZER
ENABLE
BIT NO.
NAME
CONDITION
DESCRIPTION
The adaptive equalizer is in its initialized state.
D0
Equalizer
Enable
0
1
The adaptive equalizer is enabled. This bit is used in
handshakes to control when the equalizer should calculate
its coefficients.
D1
D2
Train Inhibit
0
1
0
1
The adaptive equalizer is active.
The adaptive equalizer coefficients are frozen.
The DSP is inactive and all variables are initialized.
RESET DSP
The DSP is running based on the mode set by other control
bits
D3
16 Way
0
1
The receiver and transmitter are using the same decision
plane (based on the Modulator Control Mode).
The receiver, independent of the transmitter, is forced into a
16 point decision plane. Used for QAM handshaking.
Page: 14 of 31
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
