lxt6155 Intel Corporation, lxt6155 Datasheet - Page 24

• Manufacturer Part Number: lxt6155
• Description: 155 Mbps Sdh/sonet/atm Transceiver
• Manufacturer: Intel Corporation

2.8
24
LXT6155 — 155 Mbps SDH/SONET/ATM Transceiver
2.8.1
Figure 11. Serial Interface
Figure 12. Parallel Interface
Loopback Modes
The LXT6155 provides two loopback modes that can be executed in either hardware or software
mode: local loopback and remote loopback. In remote loopback mode, the crystal reference clock
is used to center the receive PLL to prevent illegal clock looping.
Local Loopback
Local loopback routes the transmit line output signals (TTIP and TRING) back to the receive line
inputs (RTIP and RRING). In this mode, the line transmit output signals are active (see Figure 13).
CMIERR, LOS
RPOS, RNEG
TPOS, TNEG
Nevada
Nevada
LOS, ROFP/
RPOD<0:7>
RPOCLK
CMIERR
RSOCLKP,
TPID<0:7>
RSOCLKN
TSICLKP,
TSICLKN
TPICLK
SCLK
SCLK
SDO
SDO
SDI
SDI
CS
CS
4
4
4
9
9
2
4
Terminator/ATM UNI
Terminator/ATM UNI
Processor (optional)
Processor (optional)
DATA_OUT<0:1>
CLK_OUT<0:1>
DATA_IN<0:1>
CLK_IN<0:1>
LOS
Chip Select
Data I/O
Clock
DATA_OUT<0:7>
BYTE_TCLK
DATA_IN<0:7>
BYTE_RCLK
LOS, RIFP
Chip Select
Data I/O
Clock
Overhead
Overhead
Datasheet