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XRT75R12 Datasheet(PDF) 44 Page - Exar Corporation |
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XRT75R12 Datasheet(HTML) 44 Page - Exar Corporation |
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44 / 89 page  XRT75R12 PRELIMINARY REV. P1.0.2 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR 41 6.0 DIAGNOSTIC FEATURES 6.1 PRBS Generator and Detector The XRT75R12 contains an on-chip Pseudo Random Binary Sequence (PRBS) generator and detector for diagnostic purpose. With the PRBSEN_n bit = “1”, the transmitter will send out PRBS of 223-1 in E3 rate or 215-1 in STS-1/DS3 rate. At the same time, the receiver PRBS detector is also enabled. When the correct PRBS pattern is detected by the receiver, the RNEG/LCV pin will go “Low” to indicate PRBS synchronization has been achieved. When the PRBS detector is not in sync the PRBSLS bit will be set to “1” and RNEG/LCV pin will go “High”. With the PRBS mode enabled, the user can also insert a single bit error by toggling “INSPRBS” bit. This is done by writing a “1” to INSPRBS bit. The receiver at RNEG/LCV pin will pulse “High” for one RxClk cycle for every bit error detected. Any subsequent single bit error insertion must be done by first writing a “0” to INSPRBS bit and followed by a “1”. Figure 29 shows the status of RNEG/LCV pin when the XRT75R12 is configured in PRBS mode. NOTE: In PRBS mode, the device is forced to operate in Single-Rail Mode. FIGURE 29. PRBS MODE RxClk RxNEG/LCV SYNC LOSS PRBS SYNC Single Bit Error |
Similar Part No. - XRT75R12 |
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Similar Description - XRT75R12 |
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