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What is the difference between SGMII and SerDes?
SGMII performs the same task, extended to include gigabit Ethernet, although it can be used for 10/100 Mbit/s TX/RX as well. SerDes technology, which is often used with SGMII, provides LVDS (low-voltage differential signaling) for converting between serial and parallel signal routing, as shown in the figure below.
What speed is SGMII?
The serial gigabit media-independent interface (SGMII) is a variant of MII used for Gigabit Ethernet but can also carry 10/100 Mbit/s Ethernet. It uses differential pairs at 625 MHz clock frequency DDR for TX and RX data and TX and RX clocks.
What is Usgmii?
The Universal Serial Gigabit Media Independent Interface (USGMII) is an extension of the current SGMII and QSGMII. USGMII provides flexibility to add new features while maintaining backward compatibility.
What does 1000BASE SX mean?
fiber optic Gigabit Ethernet
1000BASE-SX is a fiber optic Gigabit Ethernet standard for operation over multi-mode fiber using a 770 to 860 nanometer, near infrared (NIR) light wavelength. The standard specifies a distance capability between 220 meters and 550 meters.
What’s the difference between SGMII and 1000BASE-X SerDes?
To elaborate on @Majenko’s answer, both SGMII and 1000Base-x are dual 1000Mbps SERDES pairs (one in each direction), at least until the 1000Base-X signals reach the optical transceiver. The main difference is in the auto-negotiation capabilities.
What’s the difference between SGMII and Gigabit Ethernet?
In gigabit ethernet it’s the SGMII – Serial Gigabit Media Independent Interface. So your Ethernet chip would connect to a 1000Base-X PHY using SGMII. It could instead connect to a 1000Base-T PHY device using the same SGMII interface. There are PHYs with RGMII, SGMII and MDI. In these case RGMII connect to MAC.
How is an Ethernet chip connected to a 1000BASE-X PHY?
These two devices are connected using a Media Independent Interface (MII). In gigabit ethernet it’s the SGMII – Serial Gigabit Media Independent Interface. So your Ethernet chip would connect to a 1000Base-X PHY using SGMII. It could instead connect to a 1000Base-T PHY device using the same SGMII interface.
Is the GMII signal the same as the SGMII signal?
SGMII is a serialization of the GMII signals, and was intended to connect a MAC to a PHY. They ended up having similar features, and many devices ended up supporting both. For example, the Xilinx core supports both.