73K222AL データシートの表示（PDF） - Teridian Semiconductor Corporation
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73K222AL Datasheet PDF : 27 Pages
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73K222AL
V.22, V.21, Bell 212A, 103
Single-Chip Modem
DATA SHEET
DETECT REGISTER (continued)
D7
D6
DR
010
X
X
BIT NO.
D2
NAME
Answer Tone
Detect
D3
D4
D5
D6, D7
Carrier
Detect
Unscrambled
Mark Detect
Receive Data
Not Used
D5
D4
D3
D2
D1
D0
RECEIVE
DATA
UNSCR.
MARK
CARR. ANSWER
DETECT TONE
CALL
PROG.
LONG
LOOP
CONDITION DESCRIPTION
0
No answer tone detected.
1
Indicates detection of 2225 Hz answer tone in Bell mode
or 2100 Hz in CCITT mode. The device must be in
originate mode for detection of answer tone. For CCITT
answer tone detection, bit D0 of the Tone Register must
be set to a 1.
0
No carrier detected in the receive channel.
1
Indicates carrier has been detected in the receive
channel.
0
No unscrambled mark.
1
Indicates detection of unscrambled marks in the received
data. A valid indication requires that unscrambled marks
be received for > 165.5 ± 6.5 ms.
Continuously outputs the received data stream. This data
is the same as that output on the RXD pin, but it is not
disabled when RXD is tri-stated.
Undefined
Not used. Mask in software.
TONE REGISTER
D7
D6
TR
RXD
TRANSMIT
011
OUTPUT
GUARD
CONTR.
TONE
BIT NO.
NAME
D0
DTMF 0/
Answer/
Guard Tone
D5
D4
D3
D2
D1
D0
TRANSMIT
ANSWER
TONE
TRANSMIT
DTMF
DTMF 3
DTMF 2
DTMF 1/
OVER-
SPEED
DTMF 0/
ANSWER/
GUARD
CONDITION DESCRIPTION
D6 D5 D4 D0 D0 interacts with bits D6, D5, and D4 as shown.
X X 1 X Transmit DTMF tones.
X 0 0 0 Detects 2225 Hz in originate mode.
X 1 0 0 Transmits 2225 Hz in answer mode (Bell).
X 0 0 1 Detects 2100 Hz in originate mode.
X 1 0 1 Transmits 2100 Hz in answer mode (CCITT).
1 0 0 0 Select 1800 Hz guard tone.
1 0 0 1 Select 550 Hz guard tone.
D1
DTMF 1/
D4 D1
D1 interacts with D4 as shown.
Overspeed
00
Asynchronous DPSK +1.0% -2.5%.
01
Asynchronous DPSK +2.3% -2.5%.
Page: 12 of 27
© 2007 TERIDIAN Semiconductor Corporation
Rev 6.1
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