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73K324L Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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73K324L Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
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11 / 31 page  73K324L CCITT V.22bis, V.22, V.21, V.23, Bell 212A Single-Chip Modem 11 DETECT REGISTER D7 D6 D5 D4 D3 D2 D1 D0 DR 010 RECEIVE LEVEL INDICATOR S1 PATTERN DETECT RECEIVE DATA UNSCR. MARK DETECT CARRIER DETECT SPECIAL TONE DETECT CALL PROG. DETECT SIGNAL QUALITY INDICATOR BIT NO. NAME CONDITION DESCRIPTION 0 Indicates normal received signal. D0 Signal Quality Indicator 1 Indicates low received signal quality (above average error rate). Interacts with Special Register SQ bits D2, D1. 0 No call progress tone detected. D1 Call Progress 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. 0 Condition not detected 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. D2 Special Tone Detect 1 X 0 2100 Hz or 2225 Hz answer tone detected in QAM, DPSK mode. 0 No carrier detected in the receive channel. D3 Carrier Detect 1 Indicated carrier has been detected in the received channel. Should be time qualified by software. 0 No unscrambled mark being received. D4 Unscr. Mark Detect 1 Indicates detection of unscrambled marks in the received data. Should be time qualified by software. Continuously outputs the received data stream. D5 Receive Data This data is the same as that output on the RXD pin, but it is not disabled when RXD is tri-stated. 0 No S1 pattern being received. D6 S1 Pattern 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. |
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