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XRT82D20 Datasheet(PDF) 4 Page - Exar Corporation |
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XRT82D20 Datasheet(HTML) 4 Page - Exar Corporation |
4 / 24 page XRT82D20 3 SINGLE CHANNEL E1 LINE INTERFACE UNIT REV. 1.0.8 PIN DESCRIPTIONS PIN # SYMBOL TYPE DESCRIPTION 1 RLOS O Receiver Loss of Signal: This pin toggles Low to indicate the loss of signal at the receive inputs. 2 ClkLOS O Receiver Loss of Clock: With MuteRx=1, this pin will toggle low to indicate a loss of clock has occurred when the receive signal is lost (RLOS=0). When RLOS=0, no transitions occur on RClk, RPOS/RData and RNEG outputs. 3 TNEG/ CODE I Transmitter Negative Data Input/Coding Select: With Jitter Attenuator enabled (pin 18=1), input activity on this pin determines whether the device is configured to operate in single-rail or dual-rail mode. With n-rail transmit data applied to this pin, the device is automatically configured to operate in dual-rail mode for both transmit input and receive output. If this pin is tied high for more than 16 clock cycles, the device is configured to oper- ate in single-rail mode with HDB3 encoding and decoding functions enabled. If this pin is tied low for more than 16 clock cycles, the device is configured to oper- ate in single-rail mode with AMI encoding and decoding functions enabled. (internal pull-down). 4 RNEG/LCV O Receive Negative Data/Line Code Violation Output: If the device is configured in Dual-rail mode with n-rail data applied to pin 3, then the receive negative data will be output through this pin. If the device is configured in Single-rail mode and operate with HDB3 coding enabled, HDB3 code violation will be detected and cause this pin to go high. If the device is configured in Single-rail mode and with AMI coding selected, every bipolar violation will be reported at this pin. 5 RClk O Receive Clock: Output receive clock signal to the terminal equipment. 6 RPOS/ RData O Receive Positive/ Data Output: In Dual-rail mode, this signal is the p-rail receive output data. In Single-rail mode, this signal is the receive output data. 7 TClk I Transmitter Clock Input: Input clock signal (2.048 MHz ± 50ppm) 8 TPOS/ TData I Transmit Positive / Data Input: In Dual-rail mode, this signal is the p-rail transmit input data. In Single-rail mode, this signal is the transmit input data. 9 LLoop I Local Loop back enable (active low): Tie this pin low to enable analog Local Loop-back.In local loop-back mode, transmit output data is looped back to the input of the receiver.Input signal at RTIP and RRing are ignored. Local Loop-back has priority over Remote and Digital Loop- back mode. See “Section 2.2, The Remote Loop Back Mode” on page 24 for more details. (internal pull-up). 10 RLoop I Remote Loop Back Enable (active low): Connect this pin to ground to enable Remote Loop-back. In Remote Loop-back mode, transmit data at TPOS/TData and TNEG are ignored. See “Section 2.2, The Remote Loop Back Mode” on page 24 for more details. (internal pull- up). |
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