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XRT83SL34 データシート(PDF) 41 Page - Exar Corporation |
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XRT83SL34 データシート(HTML) 41 Page - Exar Corporation |
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41 / 80 page  XRT83SL34 QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR PRELIMINARY REV. P1.0.8 38 LOCAL ANALOG LOOP-BACK (ALOOP) With Local Analog Loop-Back activated, the transmit data at TTIP and TRING are looped-back to the analog input of the receiver. External inputs at RTIP/RRING in this mode are ignored while valid transmit data continues to be sent to the line. Local Analog Loop-Back exercises most of the functional blocks of the XRT83SL34 including the jitter attenuator which can be selected in either the transmit or receive paths. Local Analog Loop-Back is shown in Figure 18. In this mode, the jitter attenuator (if selected) can be placed in the transmit or receive path. REMOTE LOOP-BACK (RLOOP) With Remote Loop-Back activated, receive data after the jitter attenuator (if selected in the receive path) is looped back to the transmit path using RCLK as transmit timing. In this mode transmit clock and data are ignored, while RCLK and receive data will continue to be available at their respective output pins. Remote Loop-Back with jitter attenuator selected in the receive path is shown in Figure 19. FIGURE 18. LOCAL ANALOG LOOP-BACK SIGNAL FLOW FIGURE 19. REMOTE LOOP-BACK MODE WITH JITTER ATTENUATOR SELECTED IN RECEIVE PATH Rx Data & Clock Recovery Decoder TPOS TNEG TCLK RCLK RPOS RNEG Tx Encoder Timing Control JA TTIP TRING RTIP RRING Tx Decoder Timing Control Rx Data & Clock Recovery TPOS TNEG TCLK RCLK RPOS RNEG Encoder TTIP TRING RTIP RRING JA |
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