參數(shù)資料
型號(hào): XRT75R12IB
廠商: Exar Corporation
文件頁(yè)數(shù): 16/90頁(yè)
文件大?。?/td> 0K
描述: IC LIU E3/DS3/STS-1 12CH 420TBGA
標(biāo)準(zhǔn)包裝: 40
類型: 線路接口裝置(LIU)
驅(qū)動(dòng)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
XRT75R12
20
REV. 1.0.4
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
2.1
Clock Distribution
Network cards that are designed to support multiple line rates which are not configured for single frequency
mode should ensure that a clock is applied to the DS3Clk input pin. For example: If the network card being
supplied to an ISP requires E3 only, the DS-3 input clock reference is still necessary to provide read and write
access to the internal microprocessor.
Therefore, the E3 mode requires two input clock references.
If
however, multiple line rates will not be supported, i.e. E3 only, then the DS3Clk input pin may be hard wire
connected to the E3Clk input pin.
NOTE: For one input clock reference, the single frequency mode should be used.
FIGURE 4. CLOCK DISTRIBUTION CONGIFURED IN E3 MODE WITHOUT USING SFM
Clock Synthesizer
Processor
LOL_n
DS3Clk
E3Clk
CLKOUT_n
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