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參數(shù)資料
| 型號(hào)： | LXT6155 |
| 廠商： | Intel Corp. |
| 英文描述： | 155 Mbps SDH/SONET/ATM Transceiver |
| 中文描述： | 155速率的SDH / SONET / ATM的收發(fā)器 |
| 文件頁數(shù)： | 20/50頁 |
| 文件大小： | 291K |
| 代理商： | LXT6155 |
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LXT6155 — 155 Mbps SDH/SONET/ATM Transceiver
20
Datasheet
2.5.1
Hardware Mode
By setting HWSEL = Low, the LXT6155 operates in standalone hardware mode, without a serial
microprocessor interface. A subset of the functions available in the Software Mode can be set in
Hardware Mode. LXT6155 provides a comprehensive flexibility in configuring system clock
preference settings, as well as providing pins for activating loopback test modes. Tables 3, 4 and 5
show the settings that enable the functions available in hardware mode.
Figure 7. Hardware Mode
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 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.
Nevada
HWSEL
RLIS
CIS
SP
GND
Line interface encode/
decode
Remote loopback
Serial/Parallel
Clock reference select
Local loopback
LLIS
MODE
RIFE
Frame Enable
Table 3.
Reference Clock Settings
1
CIS
Clock Reference
Note
Low
TICLK
Default mode. The LXT6155 uses the transmit input clock as the
reference clock for on chip operations. No crystal is needed.
High
XTAL
The LXT6155 uses the clock signal at XTALIN as the reference
clock for Rx operation. This can either be an applied 19.44MHz
clock or a 19.44MHz crystal can be connected across XTALIN &
XTALOUT. See Table 24 for the crystal specifications.
1. For explanation, see clock sections below.
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