RGMII Protocolos compatibles

Computadoras y servidores

Reduced Gigabit Media Independent Interface

¿Qué es RGMII?

RGMII (Reduced Gigabit Media Independent Interface) is the most widely used MAC-to-PHY interface for Gigabit Ethernet in embedded systems. RGMII achieves 1 Gbps throughput using only 12 signals by employing DDR (Double Data Rate) signaling — data is sampled on both the rising and falling edges of the 125 MHz clock. This makes RGMII timing-critical, as clock-to-data alignment must be maintained within tight margins. RGMII supports 10/100/1000 Mbps operation, with the clock frequency scaling accordingly. Engineers debugging Gigabit Ethernet frequently encounter RGMII timing issues including internal vs. external clock delay configuration, PCB trace length matching, and signal integrity problems at 125 MHz DDR rates.

RGMII Referencia rápida

type	Parallel, DDR
signals	TXD[3:0], RXD[3:0], TX_CLK, RX_CLK, TX_CTL, RX_CTL
max Speed	125 MHz DDR (1 Gbps)
voltage Range	2.5V / 3.3V
standard	RGMII v2.0

Instrumentos Acute compatibles con RGMII

Soluciones recomendadas

Recomendado para decodificación

TL4234B

Todos los productos compatibles

Decodificación de protocolo

Disparo por hardware

Emulador de protocolo

Serie LA4000

Serie MSO2000

Serie MSO3000

Serie TravelLogic

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¿Cómo analizar RGMII con instrumentos Acute

Conecte su analizador lógico Acute a las señales RGMII: TXD[3:0], TX_CLK, TX_CTL, RXD[3:0], RX_CLK y RX_CTL.

Conecte un cable de tierra a la referencia de tierra de la placa objetivo.

En el software Acute, seleccione el RGMII protocol decoder y asigne cada señal al canal de entrada correspondiente.

Configure el decodificador para expected speed mode (1 Gbps DDR, 100 Mbps, or 10 Mbps).

Capture y visualice los Ethernet frames, and use timing analysis to verify clock-to-data alignment on both clock edges.

Preguntas frecuentes

Que tasa de muestreo necesito para el análisis RGMII ?

RGMII at 1 Gbps uses a 125 MHz clock with DDR data, meaning data transitions occur at 250 MHz effective rate. Sample at a minimum of 500 MHz for basic frame decoding. For timing analysis of clock-to-data skew and setup/hold margins, a sample rate of 1 GHz or higher is recommended. Los analizadores lógicos Acute con análisis de temporizado de 2 GHz are well-suited for RGMII timing validation.

Por que mi enlace RGMII funciona a 100 Mbps pero falla a 1 Gbps?

This is almost always a clock delay configuration issue. RGMII at 1 Gbps requires a 2 ns (90-degree) clock delay to properly center the clock within the data eye. At 100 Mbps, timing margins are much more forgiving so the link works without precise delay. Check whether the PHY is configured for internal clock delay (RGMII-ID mode) or if the PCB provides external delay through trace length. Capture the RGMII signals and measure the actual clock-to-data timing relationship.

Cuantos canales se necesitan para el análisis de RGMII ?

Full bidirectional RGMII analysis requires 12 channels: TXD[3:0], TX_CLK, TX_CTL (6 TX), RXD[3:0], RX_CLK, RX_CTL (6 RX). For unidirectional monitoring, 6 channels cover one direction. Adding MDIO management bus signals (MDC, MDIO) brings the total to 14 channels. The LA4000 series provides adequate channel count for full RGMII analysis.

Protocolos relacionados

MII GMII

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