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DP83256 Datasheet(PDF) 32 Page - National Semiconductor (TI) |
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DP83256 Datasheet(HTML) 32 Page - National Semiconductor (TI) |
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32 / 144 page  40 Modes of Operation (Continued) Short Internal Loopback The Short Internal Loopback mode can be used to test the functionality of the PLAYERa device not including the Clock Recovery function and to test the data paths be- tween the PLAYERa device and MACSI devices before ring insertion When in the Short Internal Loopback mode the PLAYERa device performs the following functions Directs the output data of the Transmitter Block to the input of the Receiver Block 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 See Figure 4-3 Short Internal Loopback TLF11708 – 25 FIGURE 4-3 Short Internal Loopback 32 |
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