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XRT73LC03AIV Datasheet(PDF) 9 Page - Exar Corporation |
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XRT73LC03AIV Datasheet(HTML) 9 Page - Exar Corporation |
9 / 61 page XRT73LC03A 7 REV. 1.0.2 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT 96 REGR/ RxClkINV I Register Reset Input (Invert RxClk(n)) Output - Select: The function of this pin depends upon whether the XRT73LC03A is oper- ating in the HOST Mode or in the Hardware Mode. NOTE: This pin is internally pulled "High". In the HOST-Mode - Register Reset Input: Setting this input pin "Low" causes the XRT73LC03A to reset the con- tents of the Command Registers to their default settings and default operating configuration. In the Hardware Mode - Invert RxClk Output Select: Setting this input pin "High" configures the Receive Section of all Chan- nels in the XRT73LC03A to invert their RxClk_(n) clock output signals and configures Channel (n) to output the recovered data via the RPOS_(n) and RNEG_(n) output pins on the falling edge of RxClk_(n). Setting this pin "Low" configures Channel (n) to output the recovered data via the RPOS_(n) and RNEG_(n) output pins on the rising edge of RxClk_(n). RECEIVE INTERFACE PIN # NAME TYPE DESCRIPTION CLOCK INTERFACE PIN # NAME TYPE DESCRIPTION 47 99 103 EXClk_0 EXClk_1 EXClk_2 I External Reference Clock Input - Channel (n): Apply a 34.368 MHz clock signal for E3 applications, a 44.736 MHz clock signal for DS3 applications or a 51.84 MHz clock signal for SONET STS- 1 applications. The Channel (n) Clock Recovery PLL uses this signal as a Reference Signal for Declaring and Clearing the Receive Loss of Lock Alarm. The Clock recovery PLL also generates the exact clock for the LIU. It is permissible to use the same clock that drives the TxClk_(n) input pin. It is permissible to operate the three Channels at different data rates. OPERATING MODE SELECT PIN # NAME TYPE DESCRIPTION 93 SR/(DR) I Receive Output Single-Rail/Dual-Rail Select: Setting this pin "High" configures the Receive Sections of all Channels to output data in a Single-Rail Mode to the Terminal Equipment. Setting this pin "Low" configures the Receive Section of all Channels to output data in a Dual-Rail Mode to the Terminal Equipment. |
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