73K224L データシートの表示（PDF） - TDK Corporation
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73K224L Datasheet PDF : 32 Pages
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73K224L
V.22bis/V.22/V.21/Bell 212A/Bell 103
Single-Chip Modem
TONE REGISTER (continued)
D7
D6
TR
RXD
TRANSMIT
011 OUTPUT
GUARD
CONTR.
TONE
D5
TRANSMIT
ANSWER
TONE
D4
TRANSMIT
DTMF
D3
DTMF 3
D2
DTMF 2/4
WIRE FDX
D1
DTMF 1/
EXTENDED
OVER- SPEED
D0
DTMF 0/
ANSWER/
GUARD
BIT NO.
D5
NAME
Transmit
Answer Tone
CONDITION
D5 D4 D0
00X
100
101
DESCRIPTION
D5 interacts with bits D4 and D0 as shown. Also interacts
with DR bit D2 in originate mode. See Detect Register
description.
Disables answer tone generator.
In answer mode, a Bell 2225 Hz tone is transmitted
continuously when the Transmit Enable bit is set.
Likewise, a CCITT 2100 Hz answer tone is transmitted.
D6
Transmit
0
Disables guard tone generator.
Guard Tone
1
Enables guard tone generator. (See D0 for selection of
guard tones.) Bit D4 must be zero.
D7
RXD Output
0
Enables RXD pin. Receive data will be output on RXD.
Control
1
Disables RXD pin. The RXD pin reverts to a high
impedance with internal weak pull-up resistor.
CONTROL REGISTER 2
D7
CR2
100
0
BIT NO.
D6
SPEC REG
ACCESS
NAME
D0
Equalizer
Enable
D1
Train Inhibit
D2
RESET DSP
D3
16 Way
D5
CALL INIT
D4
TRANSMIT
S1
D3
16 WAY
D2
RESET
DSP
D1
TRAIN
INHIBIT
D0
EQUALIZER
ENABLE
CONDITION DESCRIPTION
0
The adaptive equalizer is in its initialized state.
1
The adaptive equalizer is enabled. This bit is used in
handshakes to control when the equalizer should calculate
its coefficients.
0
The adaptive equalizer is active.
1
The adaptive equalizer coefficients are frozen.
0
The DSP is inactive and all variables are initialized.
1
The DSP is running based on the mode set by other control
bits
0
The receiver and transmitter are using the same decision
plane (based on the Modulator Control Mode).
1
The receiver, independent of the transmitter, is forced into a
16 point decision plane. Used for QAM handshaking.
14
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