参数资料
| 型号： | XRT73L03BIV-F |
| 厂商： | Exar Corporation |
| 文件页数： | 35/61页 |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 3CH 120LQFP |
| 标准包装： | 72 |
| 类型： | 线路接口装置（LIU） |
| 驱动器/接收器数： | 3/3 |
| 规程： | DS3，E3，STS-1 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 120-LQFP |
| 供应商设备封装： | 120-LQFP（14x20） |
| 包装： | 托盘 |
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XRT73L03B
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
38
3.3
CLOCK RECOVERY PLL
The purpose of the Clock Recovery PLL is to track
the incoming Dual-Rail data stream and to derive and
generate a recovered clock signal.
It is important to note that the Clock Recovery PLL re-
quires a line rate clock signal at the EXClk_(n) input
pin.
The Clock Recovery PLL operates in one of two
modes:
The Training Mode.
The Data/Clock Recovery Mode
3.3.1
The Training Mode
If a given channel is not receiving a line signal via the
RTIP and RRing input pins, or if the frequency differ-
ence between the line signal and that applied via the
EXClk_(n) input pin exceeds 0.5%, then the channel
operates in the Training Mode. When the channel is
operating in the Training Mode, it does the following:
a. Declare a Loss of Lock indication by toggling its
respective RLOL_(n) output pin “High".
b. Output a clock signal via the RxClk_(n) output
pins which is derived from the signal applied to
the EXClk_(n) input pin.
3.3.2
The Data/Clock Recovery Mode
If the frequency difference between the line signal
and that applied via the EXClk_(n) input pin is less
than 0.5%, then the channel operates in the Data/
Clock Recovery mode. In this mode, the Clock Re-
covery PLL locks onto the line signal via the RTIP and
RRing input pins.
3.4
THE HDB3/B3ZS DECODER
The Remote Transmitting Terminal typically encodes
the line signal into some sort of Zero Suppression
Line Code (e.g., HDB3 for E3, and B3ZS for DS3 and
STS-1). The purpose of this encoding activity was to
aid in the Clock Recovery process of this data within
the Near-End Receiving Terminal. However, once the
data has made it across the E3, DS3 or STS-1 Trans-
port Medium and has been recovered by the Clock
Recovery PLL, it is now necessary to restore the orig-
inal content of the data. Hence, the purpose of the
HDB3/B3ZS Decoding block is to restore the data
transmitted over the E3, DS3 or STS-1 line to its orig-
inal content prior to Zero Suppression Coding.
3.4.1
B3ZS Decoding (DS3/STS-1 Applications)
If the XRT73L03B is configured to operate in the DS3
or STS-1 Modes, then the HDB3/B3ZS Decoding
Blocks performs B3ZS Decoding. When the Decod-
ers are operating in this mode, each of the Decoders
parses through its respective incoming Dual-Rail data
and checks for the occurrence of either a “00V" or a
"B0V" pattern. If the B3ZS Decoder detects this par-
ticular pattern, then it substitutes these bits with a
"000" pattern.
NOTE: If the B3ZS Decoder detects any bipolar violations
that is not in accordance with the B3ZS Line Code format,
or if the B3ZS Decoder detects a string of 3 (or more) con-
secutive "0’s” in the incoming line signal, then the B3ZS
Decoder flags this event as a Line Code Violation by puls-
ing the LCV output pin “High".
Figure 24 illustrates the B3ZS Decoder at work with
two separate Zero Suppression patterns in the in-
coming Dual-Rail Data Stream.
3.4.2
HDB3 Decoding (E3 Applications)
If the XRT73L03B is configured to operate in the E3
Mode, then each of the HDB3/B3ZS Decoding Blocks
performs HDB3 Decoding. When the Decoders are
operating in this mode, they each parse through the
incoming Dual-Rail data and check for the occurrence
of either a "000V" or a "B00V" pattern. If the HDB3
FIGURE 24. AN EXAMPLE OF B3ZS DECODING
Data
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
RPOS
RNEG
0 0
V
Line Signal
B
0 V
RCLK
相关PDF资料 |
PDF描述 |
|---|---|
| XRT73L04BIV-F | IC LIU E3/DS3/STS-1 4CH 144LQFP |
| XRT73L06IB-F | IC LIU E3/DS3/STS-1 6CH 217BGA |
| XRT73LC00AIV-F | IC LIU STS1/DS3/E3 SGL 44TQFP |
| XRT73LC03AIV-F | IC LIU E3/DS3/STS-1 3CH 120LQFP |
| XRT73LC04AIV-F | IC LIU E3/DS3/STS-1 4CH 144LQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT73L03IV | 制造商:EXAR 制造商全称:EXAR 功能描述:3 CHANNEL E3/DS3/STS-1 LINE INTERFCE UNIT |
| XRT73L03IVS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Telecommunication IC |
| XRT73L04A | 制造商:EXAR 制造商全称:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
| XRT73L04AIV | 制造商:EXAR 制造商全称:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
| XRT73L04B | 制造商:EXAR 制造商全称:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
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