The JTAG interface can not only be used for testing, but also to program devices on your PCBA’s. Flash memories, FPGA’s, CPLD’s, microcontrollers (embedded flash) and serial devices like I2C, SPI and PMBus devices can be programmed via their JTAG interface or via surrounding JTAG devices. Through JTAG it is possible to program such devices after they have been mounted on the PCB. This on-board programming, or in-system programming (ISP) results in:

  • Much simpler device logistics (only non-programmed parts in stock)
  • One time handling of a device instead of multiple times
  • Easy re-programing, also in the field, for product upgrades for example

More information on in-system device programming can be found in our “In-System Device Programming guide”.

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