73K324L-28IH データシートの表示（PDF） - TDK Corporation
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73K324L-28IH Datasheet PDF : 31 Pages
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73K324L
CCITT V.22bis, V.22, V.21, V.23, Bell 212A
Single-Chip Modem
DETECT REGISTER
DR
D7
D6
D5
010
RECEIVE
S1
RECEIVE
LEVEL
PATTERN
DATA
INDICATOR DETECT
D4
UNSCR.
MARK
DETECT
D3
CARRIER
DETECT
D2
SPECIAL
TONE
DETECT
D1
CALL
PROG.
DETECT
D0
SIGNAL
QUALITY
INDICATOR
BIT NO.
D0
D1
D2
NAME
CONDITION
DESCRIPTION
Signal
Quality
Indicator
0
Indicates normal received signal.
1
Indicates low received signal quality (above average error
rate). Interacts with Special Register SQ bits D2, D1.
Call Progress
0
No call progress tone detected.
Detect
1
Indicates presence of call progress tones. The call
progress detection circuitry is activated by energy in the
normal 350 to 620 Hz call progress band.
Special Tone
0
Condition not detected
Detect
1
Condition detected
CR0 D0 TR D0 CR2 D5
1
0
1 2225 Hz ±10 Hz answer tone detected in V.22bis, V.22
modes.
1
1
1 2100 Hz ±21 Hz answer tone detected in V.22bis, V.22
modes.
0
X
0 900 Hz SCT tone detected in V.23 mode.
1
X
0 2100 Hz or 2225 Hz answer tone detected in QAM,
DPSK mode.
D3
Carrier
Detect
0
No carrier detected in the receive channel.
1
Indicated carrier has been detected in the received
channel. Should be time qualified by software.
D4
Unscr. Mark
0
No unscrambled mark being received.
Detect
1
Indicates detection of unscrambled marks in the received
data. Should be time qualified by software.
D5
Receive Data
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.
D6
S1 Pattern
0
No S1 pattern being received.
Detect
1
S1 pattern detected. Should be time qualified by
software. S1 is an unscrambled double dibit
(11001100...) sent in DPSK 1200 bit/s mode. Generated
pattern must be properly aligned to transmitter baud clock
to be detected.
D7
Receive
Level
Indicator
0
Received signal level below threshold, (≈ -25 dBm0);can
use receive gain boost (+18 dB)
1
Received signal above threshold.
11
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