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LAN8804 데이터시트(PDF) 43 Page - Microchip Technology

부품명 LAN8804
상세설명  4-Port Gigabit Ethernet Transceiver with QSGMII Support
PDF  91 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN8804 데이터시트(HTML) 43 Page - Microchip Technology

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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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