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DP83255AVF Datasheet(PDF) 16 Page - National Semiconductor (TI) |
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DP83255AVF Datasheet(HTML) 16 Page - National Semiconductor (TI) |
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16 / 96 page  40 Modes of Operation (Continued) 432 Internal Loopback The Internal Loopback mode can be used to test the func- tionality of the PLAYER device and to test the data paths between the PLAYER and BMAC devices before ring inser- tion When in the Internal Loopback mode the PLAYER device performs the following functions Directs the output data of the Transmitter Block to the input of the Receiver Block through internal paths (see Figure 2-1 PLAYER Device Block Diagram) Ignores the PMD Data Indicate pins (RXDg and RXCg) Outputs Quiet symbols through the PMD Data Request pins (TXDg) and Outputs Quiet symbols through the External Loopback Data pins (LBDg) The level of the Quiet symbols transmitted through the TXCg pins is programmable through the Transmit Quiet Level bit of the Mode Register The level of the Quiet symbols transmitted through the LBDg pins is always high regardless of the Transmit Quiet Level bit of the Mode Register If both Internal Loopback and External Loopback modes are selected Internal Loopback mode will have priority over Ex- ternal Loopback mode See Figure 4-2 for a block diagram TLF10386 – 16 FIGURE 4-2 Internal Loopback 16 |
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