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XRT83SH38IB Datasheet(PDF) 10 Page - Exar Corporation |
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XRT83SH38IB Datasheet(HTML) 10 Page - Exar Corporation |
10 / 78 page XRT83SH38 7 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT REV. 1.0.7 RXRES1 RXRES0 R10 V10 I Receive External Resistor Control Pins Hardware mode Only These pins are used in the Receive Internal Impedance mode for unique applica- tions where an accurate resistor can be used to achieve optimal return loss. When RxRES[1:0] are used, the LIU automatically sets the internal impedance to match the line build out. For example: if 240 Ω is selected, the LIU chooses an internal impedance such that the parallel combination equals the impedance chosen by TERSEL[1:0]. "00" = No External Fixed Resistor "01" = 240 Ω "10" = 210 Ω "11" = 150 Ω NOTE: These pins are internally pulled “Low” with a 50k Ω resistor. This feature is available in Host mode by programming the appropriate channel register. RCLKE/ µPTS1 J16 I Receive Clock Edge Hardware Mode This pin is used to select which edge of the recovered clock is used to update data to the receiver on the RPOS/RNEG outputs. By default, data is updated on the risinge edge. To udpdate data on the falling edge, this pin must be pulled "High". Host Mode µPTS[2:1] pins are used to select the type of microprocessor to be used for Host communication. "00" = 8051 Intel Asynchronous "01" = 68K Motorola Asynchronous "10" = x86 Intel Synchronous "11" = 860 Motorola Synchronous NOTE: This pin is internally pulled “Low” with a 50k Ω resistor. SIGNAL NAME BGA LEAD # TYPE DESCRIPTION |
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