參數(shù)資料
型號： XRT75L04
廠商： Exar Corporation
英文描述： FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER
中文描述： 四通道E3/DS3/STS-1線路接口單元，其抖動
文件頁數(shù)： 51/57頁
文件大?。?/td> 345K
代理商： XRT75L04
XRT75L04
49
REV. 1.0.4
FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
8.0
DIAGNOSTIC FEATURES:
8.1
PRBS Generator and Detector:
The XRT75L04 contains an on-chip Pseudo Random Binary Sequence (PRBS) generator and detector for
diagnostic purpose. This feature is only available in Host mode. With the PRBSEN_n bit = “1”, the transmitter
will send out PRBS of 2
23
-1 in E3 rate or 2
15
-1 in STS-1/DS3 rate. At the same time, the receiver PRBS
detector is also enabled. When the correct PRBS pattern is detected by the receiver, the RNEG/LCV pin will go
“Low” to indicate PRBS synchronization has been achieved. When the PRBS detector is not in sync the
PRBSLS bit will be set to “1” and RNEG/LCV pin will go “High”.
With the PRBS mode enabled, the user can also insert a single bit error by toggling “INSPRBS” bit. This is
done by writing a “1” to INSPRBS bit. The receiver at RNEG/LCV pin will pulse “High” for one RxClk cycle for
every bit error detected. Any subsequent single bit error insertion must be done by first writing a “0” to
INSPRBS bit and followed by a “1”.
Figure 25 shows the status of RNEG/LCV pin when the XRT75L04 is configured in PRBS mode.
N
OTE
:
In PRBS mode, the device is forced to operate in Single-Rail Mode.
8.2
LOOPBACKS:
The XRT75L04 offers three loopback modes for diagnostic purposes. In Hardware mode, the loopback modes
are selected via the RLB_n and LLB_n pins. In Host mode, the RLB_n and LLB_n bits n the Channel control
registers select the loopback modes.
8.2.1
ANALOG LOOPBACK:
In this mode, the transmitter outputs (TTIP_n and TRING_n) are connected internally to the receiver inputs
(RTIP_n and RRING_n) as shown in Figure 26. Data and clock are output at RCLK_n, RPOS_n and RNEG_n
pins for the corresponding transceiver. Analog loopback exercises most of the functional blocks of the device
including the jitter attenuator which can be selected in either the transmit or receive path.
XRT75L04 can be configured in Analog Loopback either in Hardware mode via the LLB_n and RLB_n pins or
in Host mode via LLB_n and RLB_n bits in the channel control registers.
N
OTES
:
1.
2.
In the Analog loopback mode, data is also output via TTIP_n and TRING_n pins.
Signals on the RTIP_n and RRING_n pins are ignored during analog loopback.
F
IGURE
25. PRBS MODE
RClk
RNEG/LCV
SYNC LOSS
PRBS SYNC
Single Bit Error
相關(guān)PDF資料
PDF描述
XRT75L04IV FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER
XRT75L06D SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
XRT75L06DIB SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
XRT75L06 SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
XRT75L06IB SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT75L04D 制造商:EXAR 制造商全稱:EXAR 功能描述:FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
XRT75L04DES 功能描述:時(shí)鐘合成器/抖動清除器 4CH T3/E3/STS1 LIU+DESYNCH 3.3V RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
XRT75L04DIV 功能描述:外圍驅(qū)動器與原件 - PCI 4 CHNL E3/DS3/STS 1 JITTER ATTENUATOR 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
XRT75L04DIV-F 功能描述:外圍驅(qū)動器與原件 - PCI 4-Ch DS3, E3, STS-1 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
XRT75L04DIVTR 功能描述:時(shí)鐘合成器/抖動清除器 4 CHNL E3/DS3/STS 1 JITTER ATTENUATOR RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
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