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XRT91L31 Datasheet(PDF) 8 Page - Exar Corporation |
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XRT91L31 Datasheet(HTML) 8 Page - Exar Corporation |
8 / 41 page XRT91L31 8 STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER REV. 1.0.2 PIO_CTRL LVTTL, LVCMOS I 48 Transmit Parallel Clock Directional Control Transmit Parallel Clock Output Operation If this pin is asserted "High", TXPCLK_IO is a parallel bus clock output. Data on the TXDI[7:0] must be synchronously applied prior to the sampling by the PISO at the rising edge of TXPCLK_IO clock output driven by the XRT91L31. Alternate Transmit Parallel Clock Input Operation Asserting this control pin "Low" or if left unconnected, it config- ures TXPCLK_IO to serve as a parallel bus clock input rather than a parallel bus clock output and permits the XRT91L31 to accept the external clock input. Data on the TXDI[7:0] is then sampled at the rising edge of the TXPCLK_IO clock input driven by the framer/mapper device. "Low" = TXPCLK_IO is a Parallel Clock Input. "High" = TXPCLK_IO is a Parallel Clock Output. NOTE: Parallel Clock Input operation has the advantage of permitting the framer/mapper device timing to be synchronized with the transceiver transmitter timing. This pin is provided with an internal pull-down. RLOOPS LVTTL, LVCMOS 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 dual loopback diagnostic feature in normal operation. DLOOP LVTTL, LVCMOS 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 dual loopback diagnostic feature in normal operation. ALOOP LVTTL, LVCMOS 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 PIN DESCRIPTION NAME LEVEL TYPE PIN DESCRIPTION |
Similar Part No. - XRT91L31_08 |
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Similar Description - XRT91L31_08 |
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