73K324BL
CCITT V.22bis,V.23,V.22,V.21, Bell 212A
Single-Chip Modem w/ Integrated Hybrid
DATA SHEET
TONE REGISTER
D7
D6
D5
D4
D3
D2
D1
D0
DTMF 0/
G.T./ANSW./
CALLING//
SCT
TR
011
RXD
OUTPUT
CONTROL
TRANSMIT TRANSMIT TRANSMIT DTMF
DTMF 2/
4-WIRE EXTENDED
FDX
DTMF 1/
GUARD
TONE
ANSWER
TONE
DTMF
3
OVER-
SPEED
TONE/SEL
BIT
NAME
CONDITION
DESCRIPTION
D0 interacts with bits D6, D5, and D4 as shown
D6 D5 D4 D0
D0, D4,
D5, D6
DTMF 0/
Guard Tone/
X
X
1
X
Transmit DTMF tones (overrides all other functions).
Must be in V.22 mode during DTMF transmission
Answer Tone/
Calling/SCT
1
1
0
0
0
0
0
1
Select 1800 HZ guard tone if in V.22bis or V.22 and
Answer mode in CR0.
Tone/
Transmit
Select
Select 550 Hz guard tone if in V.22bis or V.22 and
Answer mode in CR0.
Note: Bit D0 also selects the answer tone detected in Originate mode, see
Detect Register Special Tone Detect (bit D2) for details.
1
X
X
1
0
1
1
0
0
0
0
0
0
0
1
1
1300 Hz calling tone will be transmitted if V.22, V.22bis
or V.23 Originate mode is selected in CR0.
Transmit 2225 Hz Answer Tone. Must be in DPSK
Answer mode..
Transmit 2100 Hz Answer Tone. Must be in DPSK
Answer mode.
900 Hz SCT (soft carrier turnoff) tone transmitted in V.23
75 bps Receive mode. (CR0 bit D0 = 1)
D4 D1
D1 interacts with D4 as shown.
D1
D2
DTMF 1/
0
0
0
1
Asynchronous QAM or DPSK +1% -2.5%. (normal)
Extended
Overspeed
Asynchronous QAM or DPSK +2.3% -2.5%. (extended
overspeed)
D4 D2
DTMF 2/
0
0
0
1
Selects 2-wire duplex or half duplex
4 Wire FDX
D2 selects 4-wire full duplex in the modulation mode
selected. The receive path corresponds receive mode
selected by the ANS/ORIG bit CR0 D0 in terms of high or
low band operation. The transmitter is in the same band
as the receiver, but does not have magnitude filtering or
equalization on its signal as in the receive path.
Page: 15 of 34
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 6.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
