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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83256 датащи(PDF) 33 Page - National Semiconductor (TI) |
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DP83256 датащи(HTML) 33 Page - National Semiconductor (TI) |
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33 / 144 page  40 Modes of Operation (Continued) Long Internal Loopback The Long Internal Loopback mode implements the longest loopback path that is completely within the PLAYERa de- vice The Long Internal Loopback mode can be used to test the functionality of the PLAYERa device including the Clock Recovery function and to test the data paths between the PLAYERa device and MACSI devices before ring insertion When in the Long Internal Loopback mode the PLAYERa device performs the following functions Directs the output data of the Transmitter Block to the input of the Clock Recovery Module through an internal path Ignores the PMD Data Indicate pins (PMIDg) Outputs Quiet symbols through the PMD Data Request pins (PMRDg) The level of the Quiet symbols transmitted through the PMRDg pins during loopback is automatically set to the transmitter off level If both Short Internal Loopback and Long Internal Loopback modes are selected Long Internal Loopback mode will have priority over Short Internal Loopback mode This is the longest loopback path within the PLAYERa device Note that the LILB path is disconnected and should not be used when the Alternate PMD Interface is active See Figure 4-4 Long Internal Loopback TLF11708 – 26 FIGURE 4-4 Long Internal Loopback 33 |
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