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参数资料
| 型号： | LXT6155LE |
| 元件分类： | 通信、网络模块及开发工具 |
| 英文描述： | Telecomm/Datacomm |
| 中文描述： | 电信/数据通信 |
| 文件页数： | 20/48页 |
| 文件大小： | 1105K |
| 代理商： | LXT6155LE |
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Intel
LXT6155 155 Mbps SDH/SONET/ATM Transceiver
20
Datasheet
2.5.1.1
PLL Clock Reference (CIS pin)
The reference clock plays two roles: it centers the receive PLL, and it provides the receive output
clocks RSOCLKP/RSOCKLN and RPOCLK in case of Loss of Signal. When the Intel
LXT6155
powers up, it looks for this reference clock to start-up internal blocks, including the receive PLL
circuitry.
2.5.1.1.1
TICLK
This is the transmit input clock(s): either TSICLKP/TSICLKN in serial mode or TPICLK in
parallel mode.
2.5.1.1.2
XTAL
XTAL is an optional clock, created using an external crystal, connected across the XTALIN and
XTALOUT pins. The crystal provides an independent and stable clock source. This clock is also
used as the reference for the Tx clock monitoring circuitry.
2.5.1.2
Loopback Test (RLIS and LLIS pins)
The Intel
LXT6155 allows two types of loopback test: Remote loopback and Local loopback. In
Remote loopback, the received data and clock are looped back to the transmit line interface. The
Intel
LXT6155 still outputs recovered data and clock at the system interface. In Local loopback,
the transmit data is looped back to the receive input at the line interface. The Intel
LXT6155 also
transmit data onto the line interface while looping back. For descriptive diagrams, please refer to
Figure 14
and
Figure 15
.
Table 3. Reference Clock Settings
1
CIS
Clock Reference
Note
Low
TICLK
Default mode. The Intel
LXT6155 uses the transmit
input clock as the reference clock for on chip
operations. No crystal is needed.
High
XTAL
The Intel
LXT6155 uses the clock signal at XTALIN as
the reference clock for Rx operation. This can either be
an applied 19.44 MHz clock or a 19.44 MHz crystal
can be connected across XTALIN & XTALOUT. See
Table 25
for the crystal specifications.
1. For explanation, see clock sections below.
Table 4. Loopback Selection
RLIS
LLIS
Description
Low
Low
Normal operation. No loopback testing.
Low
High
Local loopback test activate.
High
Low
Remote loopback test activate.
High
High
Invalid mode. Do not use.
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