CS61310-CL Cirrus Logic, Inc., CS61310-CL Datasheet - Page 14

• Manufacturer Part Number: CS61310-CL
• Description: Interface, T1 Line Interface Unit
• Manufacturer: Cirrus Logic, Inc.

2.13
TAOS
LLOOP
RLOOP
LBO2, 1
CODER
(TAZ)
NLOOP
LOS
2.14
AIS
RAMPLSE
LOOPDN
14
7 (MSB)
7 (MSB)
TAOS
AIS
Control Register 1: Address 0x10
Control Register 2: Address 0x11
RAMPLSE
LLOOP
6
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.
AIS = 1 when an all ones pattern is present at the receiver. This bit is reset to “0” by the first
read occurring after the AIS condition has cleared.
An interrupt will occur when AIS is present unless a “1” is written to AIS disabling the interrupt.
grammable, transmit RAM.
Setting LOOPDN to “1” causes the data pattern 001... to be repetitively transmitted.
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
Alarm Indication Signal.
When RAMPLSE = 1, output pulse shapes are determined by the codes in the internal, pro-
Loop Down
6
set to “0”
RLOOP
LBO1
0
1
0
1
RSVD
5
5
LOOPDN
LBO2
0 dB
-7.5 dB
-15 dB
-22.5 dB
Attenuation
4
4
LBO1
LOOPUP
3
3
CODER
TAZ
RPWDN
2
2
NLOOP
TxHIZ
1
1
DS440F1 FEB ‘03
CS61310
set to “0”
0 (LSB)
0 (LSB)
RSVD
LOS