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LAN9354 Datasheet(PDF) 99 Page - Microchip Technology |
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LAN9354 Datasheet(HTML) 99 Page - Microchip Technology |
99 / 487 page 2015 Microchip Technology Inc. DS00001926B-page 99 LAN9354 9.2.16 LOOPBACK OPERATION The PHYs may be configured for near-end loopback and connector loopback. These loopback modes are detailed in the following subsections. 9.2.16.1 Near-end Loopback Near-end loopback mode sends the digital transmit data back out the receive data signals for testing purposes, as indi- cated by the blue arrows in Figure 9-6. The near-end loopback mode is enabled by setting the Loopback (PHY_LOOP- BACK) bit of the PHY x Basic Control Register (PHY_BASIC_CONTROL_x) to “1”. A large percentage of the digital circuitry is operational in near-end loopback mode because data is routed through the PCS and PMA layers into the PMD sublayer before it is looped back. The COL signal will be inactive in this mode, unless Collision Test Mode (PHY_COL_TEST) is enabled in the PHY x Basic Control Register (PHY_BASIC_CONTROL_x). The transmitters are powered down regardless of the state of the internal MII TXEN signal. 12 91 13 102 14 113 15 123 Note: For a properly terminated cable (Match case), there is no reflected signal. In this case, the TDR Channel Length field is invalid and should be ignored. FIGURE 9-6: NEAR-END LOOPBACK BLOCK DIAGRAM TABLE 9-9: MATCH CASE ESTIMATED CABLE LENGTH (CBLN) LOOKUP 10/100 Ethernet MAC CAT-5 XFMR Digital RXD TXD Analog RX TX X X |
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