參數(shù)資料
型號: XRT75R12DIB
廠商: Exar Corporation
文件頁數(shù): 67/133頁
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 12CH 420TBGA
標準包裝: 40
類型: 線路接口裝置(LIU)
驅(qū)動器/接收器數(shù): 12/12
規(guī)程: DS3,E3,STS-1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 420-LBGA 裸露焊盤
供應(yīng)商設(shè)備封裝: 420-TBGA(35x35)
包裝: 托盤
XRT75R12D
35
REV. 1.0.3
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
6.0
THE TRANSMITTER SECTION
The transmitter is designed so that the LIU can accept serial data from a local device, encode the data
properly, and then output an analog pulse according to the pulse shape chosen in the appropriate registers.
This section describes the detailed operation of various blocks within the transmit path. A simplified block
diagram of the transmit path is shown in Figure 22.
Transmit Digital Input Interface
The method for applying data to the transmit inputs of the LIU is a serial interface consisting of TxClk, TxPOS,
and TxNEG. For single rail mode, only TxClk and TxPOS are necessary for providing the local data from a
Framer device or ASIC. Data can be sampled on either edge of the input clock signal by programming the
appropriate register. A typical interface is shown in Figure 23.
FIGURE 22. TRANSMIT PATH BLOCK DIAGRAM
FIGURE 23. TYPICAL INTERFACE BETWEEN TERMINAL EQUIPMENT AND THE XRT75R12D (DUAL-RAIL DATA)
Channel n
Device
Monitor
MTIP_n
MRing_n
DMO_n
Timing
Control
Tx
Pulse
Shaping
HDB3/
B3ZS
Encoder
Tx
Control
Jitter
Attenuator
MUX
Line
Driver
TxON
TxClk_n
TxPOS_n
TxNEG_n
TTIP_n
TRing_n
Terminal
Equipment
(E3/DS3 or STS-1
Framer)
Exar E3/DS3/STS-1 LIU
Transmit
Logic
Block
TxPOS
TxNEG
TxLineClk
TPData
TNData
TxClk
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