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XRT91L30 Datasheet(PDF) 8 Page - Exar Corporation |
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XRT91L30 Datasheet(HTML) 8 Page - Exar Corporation |
8 / 40 page XRT91L30 PRELIMINARY xr xr xr xr STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER REV. P1.0.8 6 RLOOPS LVTTL I 63 Serial Remote Loopback The serial remote loopback mode interconnects the receive serial data input to the transmit serial data output. If serial remote loopback is enabled, the 8-bit parallel transmit data input is ignored while the 8-bit parallel receive data output is maintained. "Low" = Disabled "High" = Serial Remote Loopback Mode Enabled NOTE: DLOOP and RLOOPS can be enabled simultaneously to achieve a SPLIT loopback diagnostic feature in normal operation. DLOOP LVTTL I 62 Digital Local Loopback The digital local loopback mode interconnects the 8-bit parallel transmit data input and TxCLK to the 8-bit parallel receive data output and RxCLK respectively while maintaining the transmit serial data output. If digital local loopback is enabled, the receive serial data input is ignored. "Low" = Disabled "High" = Digital Local Loopback Mode Enabled NOTE: DLOOP and RLOOPS can be enabled simultaneously to achieve a SPLIT loopback diagnostic feature in normal operation. ALOOP LVTTL I 64 Analog Local Loopback This loopback feature serializes the 8-bit parallel transmit data input and presents the data to the transmit serial output and in addition it also internally routes the serialized data back to the Clock and Data Recovery block for serial to parallel conversion. The received serial data input is ignored. "Low" = Disabled "High" = Analog Local Loopback Mode Enabled NAME LEVEL TYPE PIN DESCRIPTION |
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