CS61574A/75 Cirrus Logic, Inc., CS61574A/75 Datasheet - Page 26

• Manufacturer Part Number: CS61574A/75
• Description: T1/E1 Line Interface Unit for Stratum-4 applications
• 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)
Ordering Guide
26
CS61575-IP1
CS61575-IL1
CS61574A-IP1
CS61574A-IL1
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 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.
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.
Model
load between TTIP and TRING. A transformer is required as shown in Table A1.
Frequency
T1 & E1
T1 & E1
T1 & E1
T1 & E1
FIFO Depth (Bits)
192
192
32
32
Package
28-pin Plastic DIP
28-pin PLCC
28-pin Plastic DIP
28-pin PLCC
CS61574A CS61575
DS154F2