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XRT83SL314IB bảng dữ liệu(PDF) 39 Page - Exar Corporation |
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XRT83SL314IB bảng dữ liệu(HTML) 39 Page - Exar Corporation |
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39 / 85 page ![]() XRT83SL314 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT PRELIMINARY REV. P1.0.5 34 4.1.3 Digital Loopback With digital loopback activated, the transmit input data at TCLK/TPOS/TNEG is looped back to the receive output data at RCLK/RPOS/RNEG. The digital loopback mode includes the Transmit JA (if enabled). The receive input data at RTIP/RRING is ignored while valid transmit output data continues to be sent to the line. A simplified block diagram of digital loopback is shown in Figure 30. FIGURE 30. SIMPLIFIED BLOCK DIAGRAM OF DIGITAL LOOPBACK 4.1.4 Dual Loopback With dual loopback activated, the remote loopback is combined with the digital loopback. A simplified block diagram of dual loopback is shown in Figure 31. FIGURE 31. SIMPLIFIED BLOCK DIAGRAM OF DUAL LOOPBACK Encoder Decoder Timing Control Data and Clock Recovery JA JA Tx Rx TAOS NLC/PRBS/QRSS TTIP TRING RTIP RRING TCLK TPOS TNEG RCLK RPOS RNEG Encoder Decoder Timing Control Data and Clock Recovery JA JA Tx Rx TAOS NLC/PRBS/QRSS TTIP TRING RTIP RRING TCLK TPOS TNEG RCLK RPOS RNEG |
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