CS61310-IP Cirrus Logic, Inc., CS61310-IP Datasheet - Page 13

• Manufacturer Part Number: CS61310-IP
• Description: T1 line interface unit
• Manufacturer: Cirrus Logic, Inc.

2.12.1 Control Register 1: Address 0x10
TAOS
LLOOP
RLOOP
LBO2, 1
CODER
(TAZ)
NLOOP
LOS
DS440PP2
7 (MSB)
TAOS
LLOOP
When TAOS = 1, all ones are transmitted at the TCLK frequency
When LLOOP = 1, data input at TPOS, TNEG (TDATA) is internally looped back and output on
RPOS, RNEG (RDATA). TCLK is routed to RCLK, through the jitter attenuator, if activated.
When RLOOP = 1, clock and data recovered by the receiver are sent back through the transmit
path and retransmitted. The clock and data are routed through the jitter attenuator, if activated.
LBO2
0
0
1
1
When not in coder mode (TPOS/TNEG are data inputs) setting TAZ to “1” causes all zeros to
be transmitted.
NLOOP = 1 when a network loopback code has been detected on the received signal.
An interrupt will occur when NLOOP changes state unless a “1” is written to NLOOP disabling
the interrupt.
LOS = 1 when the loss of signal criteria have been met (175 zeros).
LOS = 0 when a valid signal is being received.
An interrupt will occur when LOS changes state unless a “1” is written to LOS disabling the in-
terrupt.
Transmit All Ones Select
Local Loopback
Remote Loopback
Line BuildOut
Zero Substitution (valid only when TNEG (UBS) is tied high, invoking coder mode).
Setting CODER to “1” enables B8ZS encoding and decoding.
Network Loopback
Loss Of Signal
6
RLOOP
LBO1
0
1
0
1
5
LB02
Attenuation
0 dB
-7.5 dB
-15 dB
-22.5 dB
4
LB01
3
CODER
TAZ
2
NLOOP
1
CS61310
0 (LSB)
LOS
13