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XRT91L80_0507 Datasheet(PDF) 7 Page - Exar Corporation |
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XRT91L80_0507 Datasheet(HTML) 7 Page - Exar Corporation |
7 / 45 page xr xr xr xr PRELIMINARY XRT91L80 REV. P1.1.0 2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER 5 HARDWARE COMMON CONTROL NAME LEVEL TYPE PIN DESCRIPTION RLOOPS LVTTL, LVCMOS I C10 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 4-bit parallel transmit data input is ignored while the 4-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 dual loopback diagnostic feature. This pin is provided with an internal pull-down. RLOOPP LVTTL, LVCMOS I A11 Parallel Remote Loopback The parallel remote loopback mode allows the serial data input stream to pass through the clock and data recovery circuit and looped-back at the parallel interface to the serial output port. The 4-bit parallel transmit data input is ignored while the 4-bit parallel receive data output is maintained. "Low" = Disabled "High" = Parallel Remote Loopback Mode Enabled NOTE: DLOOP and RLOOPS should be disabled when RLOOPP is enabled. The internal FIFO should also be flushed using FIFO_RST pin or register bit when parallel remote loopback is enabled/disabled. This pin is provided with an internal pull-down. DLOOP LVTTL, LVCMOS I B6 Digital Local Loopback The digital local loopback mode interconnects the 4-bit parallel transmit data and parallel transmit clock input to the 4-bit paral- lel receive data and parallel receive clock output 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 dual loopback diagnostic feature. This pin is provided with an internal pull-down. |
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