CS61304A Cirrus Logic, Inc., CS61304A Datasheet - Page 25

• Manufacturer Part Number: CS61304A
• Description: T1-E1 Line Interface Unit for CPE-ISDN PRI
• Manufacturer: Cirrus Logic, Inc.

TTIP, TRING - Transmit Tip, Transmit Ring, Pins 13 and 16.
Status
AIS - Alarm Indication Signal, Pin 11. (Extended Hardware Mode)
BPV- Bipolar Violation Strobe, Pin 6. (Extended Hardware Mode)
DPM - Driver Performance Monitor, Pin 11. (Hardware and Host Modes)
LOS - Loss of Signal, Pin 12.
MTIP, MRING - Monitor Tip, Monitor Ring, Pins 17 and 18. (Hardware and Host Modes)
DS156PP2
The AMI signal is driven to the line through these pins. The transmitter output is designed to
drive a 75
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 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 goes high if no activity is detected on MTIP and MRING.
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.
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 a 1 to the "clear
DPM" bit will prevent an interrupt from the driver performance monitor.
load between TTIP and TRING. A transformer is required as shown in Table A1.
CS61304A
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