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LAN8808D Datasheet(PDF) 41 Page - Microchip Technology

Part # LAN8808D
Description  4-Port Gigabit Ethernet Transceiver with QSGMII Support
PDF  80 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN8808D Datasheet(HTML) 41 Page - Microchip Technology

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LAN8808D
© 2026 Microchip Technology Inc. and its subsidiaries
DS00005833C-page 41
5.12
Loopbacks
The device supports the following loopback operations to verify analog and/or digital paths:
• Digital (Near-End) Loopback
• Remote (Far-End) Loopback
• External Connector Loopback
• QSGMII Loopback
All loopbacks are enabled on an individual per-port basis.
5.12.1
DIGITAL (NEAR-END) LOOPBACK
This loopback mode checks the QSGMII transmit and receive data paths between the device and the external MAC,
and is supported for all three speeds (10/100/1000 Mbps) at full-duplex.
The loopback data path is shown in Figure 5-3.
1.
QSGMII MAC transmits frames to the device.
2.
Frames are wrapped around inside the device.
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.
FIGURE 5-3:
DIGITAL (NEAR-END) LOOPBACK
FIGURE 5-4:
REMOTE (FAR-END) LOOPBACK
PCS
PMA
LAN8808D
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
LAN8808D
MAC
Switch or SoC
Link
Partner
GPHY Port X
PCS1G
Port X
PCS1G
PCS1G
PCS1G
Other
Ports
MAC
MAC
MAC
Port X
QSGMII



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