SGMII Protocolos suportados

Computadores e servidores

Serial Gigabit Media Independent Interface

O que é SGMII?

SGMII (Serial Gigabit Media Independent Interface) is a serial alternative to GMII and RGMII for Gigabit Ethernet MAC-to-PHY connections. Originally defined by Cisco, SGMII uses a single differential pair in each direction (TX+/-, RX+/-) running at 1.25 Gbps with 8b/10b encoding. SGMII drastically reduces pin count to just 4 signal pins (plus optional reference clock), making it popular in switch ICs, SoCs, and multi-port Ethernet designs where routing many parallel data lines is impractical. Engineers debugging SGMII links need to verify the serial data encoding, auto-negotiation, and link status signaling that occurs in-band within the SGMII data stream.

SGMII Referência rápida

type Serial, differential
signals TX+/-, RX+/-
max Speed 1.25 Gbps
voltage Range Differential
standard Cisco SGMII

Instrumentos Acute compatíveis com SGMII

Série TravelLogic

Série TravelLogic
Série LA4000

Série LA4000

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Como analisar SGMII com instrumentos Acute

1

Conecte seu analisador lógico Acute aos pares diferenciais SGMII TX+/-, RX+/- usando sondas diferenciais apropriadas.

2

Conecte um fio terra a referência de terra da placa alvo.

3

No software Acute, selecione o SGMII protocol decoder e atribua os sinais diferenciais aos canais de entrada correspondentes.

4

Configure o decodificador para expected line rate and encoding.

5

Capture e visualize os SGMII data showing Ethernet frame content and in-band auto-negotiation status.

Perguntas frequentes

Qual taxa de amostragem e necessária para a análise SGMII ?
SGMII operates at 1.25 Gbps serial rate. For data content decoding, this exceeds typical logic analyzer sample rates. However, os analisadores lógicos Acute can capture lower-level aspects of SGMII such as link status signaling and in-band auto-negotiation. For full serial data capture at 1.25 Gbps, specialized high-speed analyzers or oscilloscopes are typically required.
Por que meu link SGMII não se estabelece?
SGMII link establishment depends on in-band auto-negotiation, which exchanges link parameters (speed, duplex) using a modified Ethernet auto-negotiation mechanism within the serial stream. Common failure causes include reference clock issues, incorrect serializer/deserializer (SerDes) configuration, PCB differential pair impedance mismatch, or incompatible auto-negotiation settings between the MAC and PHY. Verify the reference clock presence and frequency, and check PHY register configuration via MDIO.
Quantos canais são necessários para a análise de SGMII ?
SGMII requires 4 channels for the two differential pairs (TX+, TX-, RX+, RX-). If a reference clock is present, add 1-2 channels. For monitoring the MDIO management interface alongside SGMII, add 2 more channels for MDC and MDIO. Total: 4-8 channels depending on what signals you need to monitor.

Protocolos relacionados

RGMII GMII

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