CS61575-IP1 datasheet(26/44 Pages) CIRRUS

26 / 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 75

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 the ones

density reaches 12.5% (based upon 175 bit periods starting with a one and containing less than

100 consectutive zeros) as prescribed in ANSI T1.231-1993. 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.

Ordering Guide

Model

Frequency

FIFO Depth (Bits)

Package

CS61575-IP1

T1 & E1

192

28-pin Plastic DIP

CS61575-IL1

T1 & E1

192

28-pin PLCC

CS61574A-IP1

T1 & E1

28-pin Plastic DIP

CS61574A-IL1

T1 & E1

28-pin PLCC

CS61574A CS61575

DS154F2

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