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DS2155 Datasheet(PDF) 72 Page - Dallas Semiconductor |
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DS2155 Datasheet(HTML) 72 Page - Dallas Semiconductor |
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72 / 238 page  DS2155 72 of 238 Bit 3/Local Loopback (LLB). In this loopback, data continues to be transmitted as normal through the transmit side of the SCT. Data being received at RTIP and RRING are replaced with the data being transmitted. Data in this loopback passes through the jitter attenuator. See Figure 3-2 for more details. 0 = loopback disabled 1 = loopback enabled Bit 4/Line Interface Unit Mux Control (LIUC). This is a software version of the LIUC pin. When the LIUC pin is connected high, the LIUC bit has control. When the LIUC pin is connected low, the framer and LIU are separated and the LIUC bit has no effect 0 = if LIUC pin connected high, LIU internally connected to framer block and deactivate the TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins 1 = if LIUC pin connected high, disconnect LIU from framer block and activate the TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins LIUC Pin LIUC Bit Condition 0 0 LIU and framer separated 0 1 LIU and framer separated 1 0 LIU and framer connected 1 1 LIU and framer separated Bits 5 to 7/Unused, must be set to 0 for proper operation |
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