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

2.4.1 JTAG Applications

JTAG is an industry standard for testing PCBs and Integrated circuits, as well as programming many FPGAs. The ability to run boundary scan tests, program, and debug makes JTAG essential across development, production, and deployments. Because of this, JTAG ports are found on microprocessors and JTAG headers are found on many PCBs across every market.

In enterprise computing, JTAG headers are commonly found in Rack servers. JTAG is essential in this application as many servers require periodic diagnostic maintenance. Having a JTAG port available on servers enable the technicians and engineers to quickly debug issues during maintenance.

GUID-D373B69A-A5B6-4B94-91FA-BB643FD2DC00-low.gifFigure 2-11 JTAG in Rack Servers