CS61305A-IL1 Cirrus Logic, Inc., CS61305A-IL1 Datasheet - Page 23

• Manufacturer Part Number: CS61305A-IL1
• Description: T1/E1 line interface
• Manufacturer: Cirrus Logic, Inc.

TPOS, TNEG - Transmit Positive Data, Transmit Negative Data, Pins 3 and 4. (Hardware and
Host Modes)
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)
DS157PP3
The transmit NRZ digital data to TTIP and TRING is input on these pins. A logic 1 on TPOS
causes a positive pulse (with respect to ground) to be transmitted on the TTIP pin, and a logic 1
on TNEG causes a negative pulse (with respect to ground) to be transmitted on the TRING pin.
TPOS and TNEG are sampled on the falling edge of TCLK.
The AMI signal is driven to the line through these pins. This output is designed to drive a 75
load. A transformer is required as shown in Figure A1 of the Applications section. Clock and data
are sourced on TCLK and TPOS/ TNEG or TDATA.
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 containing no more than 15 consecutive zeros.
These pins are normally connected to TTIP and TRING and monitor the transmitter output. 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.
CS61305A
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