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CS61577 Datasheet(PDF) 24 Page - Cirrus Logic |
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CS61577 Datasheet(HTML) 24 Page - Cirrus Logic |
24 / 44 page TTIP, TRING - Transmit Tip, Transmit Ring, Pins 13 and 16. The AMI signal is driven to the line through these pins. The transmitter output is designed to drive a 25 Ω load between TTIP and TRING. A transformer is required as shown in Table A1. Status AIS - Alarm Indication Signal, Pin 11. (Extended Hardware Mode) AIS goes high when unframed all-ones condition (blue alarm) is detected, using the detection criteria of less than three zeros out of 2048 bit periods. BPV- Bipolar Violation Strobe, Pin 6. (Extended Hardware Mode) BPV strobes high when a bipolar violation is detected in the received signal. B8ZS (or HDB3) zero substitutions are not flagged as bipolar violations if the B8ZS (or HDB3) decoder has been enabled. DPM - Driver Performance Monitor, Pin 11. (Hardware and Host Modes) DPM goes high if no activity is detected on MTIP and MRING. LOS - Loss of Signal, Pin 12. LOS goes high when 175 consecutive zeros have been received. LOS returns low when 3 ones are received within 32 bit periods with no more than 15 consecutive zeros. When in the loss of signal state RPOS/RNEG or RDATA are forced low, and ACLKI (if present) is output on RCLK via the jitter attenuator. If ACLKI is not present during LOS, RCLK is forced to the center frequency of the crystal oscillator. MTIP, MRING - Monitor Tip, Monitor Ring, Pins 17 and 18. (Hardware and Host Modes) These pins are normally connected to TTIP and TRING and monitor the output of a line interface IC. If the INT pin in the host mode is used, and the monitor is not used, writing "clear DPM" to the serial interface will prevent an interrupt from the driver performance monitor. CS61577 24 DS155PP2 |
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