參數(shù)資料
型號(hào)： XRT73L04BIV
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
中文描述： DATACOM, PCM TRANSCEIVER, PQFP144
封裝： 20 X 20 MM, 1.40 MM HEIGHT, TQFP-144
文件頁(yè)數(shù)： 42/64頁(yè)
文件大?。?/td> 359K
代理商： XRT73L04BIV
XRT73L04B
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
38
3.3
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.
C
LOCK
R
ECOVERY
PLL
3.4
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 XRT73L04B 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.
T
HE
HDB3/B3ZS D
ECODER
N
OTE
:
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
If the XRT73L04B is configured to operate in the E3
Mode, then each of the HDB3/B3ZS Decoding Blocks
performs HDB3 Decoding. When the Decoders are
HDB3 Decoding (E3 Applications)
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
F
IGURE
24. A
N
E
XAMPLE
OF
B3ZS D
ECODING
Data
0 1 0 1 1 0 0 0 1 0 1 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 1
RPOS
RNEG
0 0 V
Line Signal
B 0 V
RCLK
相關(guān)PDF資料
PDF描述
XRT73L04 4 Channel E3/DS3/STS-1 Line Interface Unit(4通道 E3/DS3/STS-1線接口單元)
XRT73L06 SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L06IB SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73LC00A E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73LC00AIV E3/DS3/STS-1 LINE INTERFACE UNIT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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XRT73L06 制造商:EXAR 制造商全稱:EXAR 功能描述:SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
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XRT73L06IB 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
XRT73L06IB-F 功能描述:接口 - 專用 RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59
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