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LAN8804 データシート(PDF) 43 Page - Microchip Technology |
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LAN8804 データシート(HTML) 43 Page - Microchip Technology |
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43 / 91 page  LAN8804 © 2024 Microchip Technology Inc. and its subsidiaries DS00003591G-page 43 3. The device transmits frames back to QSGMII MAC. 5.12.2 REMOTE (FAR-END) LOOPBACK This loopback mode checks the line (differential pairs, transformer, RJ-45 connector, Ethernet cable) transmit and receive data paths between the device and its link partner, and is supported for 1000BASE-T full-duplex mode only. The loopback data path is shown in Figure 5-4. 1. The Gigabit PHY link partner transmits frames to the device. 2. Frames are wrapped around inside the device. 3. The device transmits frames back to the Gigabit PHY link partner. 5.12.3 EXTERNAL CONNECTOR LOOPBACK The external connector loopback testing feature allows the twisted pair interface to be looped back externally. This loop- back tests the PHY digital and MAC connectivity. When using this feature, the PHY must be connected to a loopback connector or a loopback cable. Pair A must be connected to pair B, and pair C to pair D, as shown in Figure 5-5. The connector loopback feature functions at all available interface speeds. FIGURE 5-3: DIGITAL (NEAR-END) LOOPBACK FIGURE 5-4: REMOTE (FAR-END) LOOPBACK FIGURE 5-5: EXTERNAL CONNECTOR LOOPBACK PCS PMA LAN8804 MAC Switch or SoC Link Partner GPHY Port X PCS1G Port X PCS1G PCS1G PCS1G Other Ports MAC MAC MAC Port X QSGMII PCS PMA LAN8804 MAC Switch or SoC Link Partner GPHY Port X PCS1G Port X PCS1G PCS1G PCS1G Other Ports MAC MAC MAC Port X QSGMII PCS PMA LAN8804 MAC Switch or SoC GPHY Port X PCS1G Port X PCS1G PCS1G PCS1G Other Ports MAC MAC MAC Port X QSGMII A B C D |
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