SCEA065B November   2018  – March 2021 SN74AVC4T774 , SN74AXC1T45 , SN74AXC4T245 , SN74AXC4T774 , SN74AXC8T245 , SN74AXC8T245-Q1 , SN74AXCH1T45 , SN74AXCH4T245 , SN74AXCH8T245


  1.   Trademarks
  2. 1Introduction
  3. 2Common Interfaces and AXC Implementation
    1. 2.1 General Purpose Input Output (GPIO)
    2. 2.2 Serial Peripheral Interface (SPI)
      1. 2.2.1 Voltage Translation for SPI
      2. 2.2.2 SPI Applications
    3.     8
    4. 2.3 UART
      1. 2.3.1 Voltage Translation With UART
      2. 2.3.2 UART Applications
    5. 2.4 Joint Test Action Group (JTAG)
      1. 2.4.1 JTAG Applications
    6. 2.5 Reduced Gigabit Media Independent Interface (RGMII)
      1. 2.5.1 Voltage Translation for RGMII
      2. 2.5.2 RGMII Applications
      3. 2.5.3 Skew Performance
  4. 3Summary
  5. 4Related Documentation
  6. 5Revision History

RGMII Applications

RGMII is used in many applications that need large amounts of bandwidth due to its very high speed. Because of this, RGMII is found in many applications that sends data over ethernet, making it a widely used communication protocol in industrial and telecommunications sectors.

RGMII is heavily used in IP network cameras in the industrial sector. Figure 2-13 illustrates an example of an IP network camera transferring data over the Ethernet using RGMII. Once all video and audio data is processed, they are sent from the MAC to the PHY where they are serialized and sent over Ethernet. If the MAC and PHY are operating at different voltage levels, use a level shifter, such as the SN74AXC8T245 or the SN74AXCH8T245, to bridge the voltage mismatch to enable communication. Voltage translation may be also be required between the image sensor(or other peripherals) and the MPU.

GUID-CE59FD13-C500-4720-9221-242291EA5502-low.gifFigure 2-13 Data Over Ethernet in IP Network Camera Using RGMII