73K224L-28IH TDK [TDK Electronics], 73K224L-28IH Datasheet - Page 10

• Manufacturer Part Number: 73K224L-28IH
• Description: V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem
• Manufacturer: TDK [TDK Electronics]

73K224L
V.22bis/V.22/V.21/Bell 212A/Bell 103
Single-Chip Modem
CONTROL REGISTER 1
DETECT REGISTER
BIT NO.
D0
D1
CR1
001
BIT NO.
D4
D5
D7, D6
010
DR
TRANSMIT
INDICATOR
PATTERN
RECEIVE
LEVEL
D7
D7
1
Enable Detect
Signal Quality
Call Progress
Scrambler
Transmit
Interrupt
Indicator
Bypass
Pattern
NAME
NAME
Detect
TRANSMIT
PATTERN
(continued)
PATTERN
DETECT
D6
0
D6
S1
CONDITION
CONDITION
D7
0
0
1
1
DETECT
ENABLE
RECEIVE
INT.
0
1
0
1
0
1
0
1
DATA
D5
D5
D6
0
1
0
1
SCRAMB
BYPASS
DETECT
DESCRIPTION
Selects normal operation. DPSK and QAM data is passed through
scrambler.
Selects Scrambler Bypass. Bypass DPSK and QAM data is
routed around scrambler in the transmit path.
Disables interrupt at INT pin. All interrupts are normally
disabled in power down mode.
Enables INT output. An interrupt will be generated with a
change in status of DR bits D1-D4 and D6. The answer
tone and call progress detect interrupts are masked when
the TX enable bit is set. Carrier detect is masked when TX
DTMF is activated. All interrupts will be disabled if the
device is in power down mode.
Selects normal data transmission as controlled by the state
of the TXD pin.
Selects an alternating mark/space transmit pattern for
modem testing and handshaking. Also used for S1 pattern
generation. See CR2 bit D4.
Selects a constant mark transmit pattern.
Selects a constant space transmit pattern.
UNSCR
DESCRIPTION
Indicates normal received signal.
Indicates low received signal quality (above average error
rate). Interacts with special register bits D2, D1.
No call progress tone detected.
Indicates presence of call progress tones. The call progress
detection circuitry is activated by energy in the normal 350
to 620 Hz call progress bandwidth.
MARK.
D4
10
D4
CONTROL
DETECT
CARR.
CLK
D3
D3
ANSWER
DETECT
TONE
RESET
D2
D2
DETECT
PROG.
CALL
MODE
TEST
D1
D1
1
INDICATOR
QUALITY
SIGNAL
MODE
TEST
D0
D0
0