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LAN8804 Datasheet(PDF) 44 Page - Microchip Technology |
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LAN8804 Datasheet(HTML) 44 Page - Microchip Technology |
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44 / 91 page  LAN8804 DS00003591G-page 44 © 2024 Microchip Technology Inc. and its subsidiaries 5.12.4 QSGMII LOOPBACK This QSGMII loopback testing feature calls various portions of the QSGMII block to be tested, as shown in Figure 5-5. When frames are looped in the QSGMII PCS1G, individual ports are looped, not the entire QSGMII. When frames are looped in the QSGMII SerDes, all four ports are looped. FIGURE 5-6: QSGMII LOOPBACK QSGMII PCS1G TBI Loopback PCS PMA LAN8804 MAC Switch or SoC Link Partner GPHY Port X PCS1G Port X Other Ports MAC MAC MAC Port X QSGMII PCS1G PCS1G PCS1G PCS PMA LAN8804 MAC Switch or SoC Link Partner GPHY Port X PCS1G Port X Other Ports MAC MAC MAC Port X QSGMII PCS1G PCS1G PCS1G QSGMII PCS1G GMII Loopback LAN8804 MAC Switch or SoC MAC MAC MAC QSGMII QSGMII SerDes Loopback PCS PMA Link Partner GPHY PCS1G Port 3 PCS PMA Link Partner GPHY PCS1G Port 2 PCS PMA Link Partner GPHY PCS1G Port 1 PCS PMA Link Partner GPHY PCS1G Port 0 |
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