PLDTool

FAQ: What is the In-System Device Programming (ISP)?

Filed under FAQ / JTAG IEEE 1149.1

Q: What is the In-System Device Programming (ISP)?

Answer:

ISP refers to programming or configuring programmable hardware devices such as Programmable Logic Devices (PLDs), Programmable Array Logic (PALs), Complex Programmable Logic Devices (CPLDs) and Microcontrollers (MCUs) after they have been assembled on the printed circuit board.

Other devices, such as some of the flash memories, can be programmed indirectly through their connection to devices in the JTAG chain.

The possibility to use JTAG to program devices 'in system' avoids the need to buy expensive programmer's and socketed devices. Another advantage is having the option of an easy update of the image held on the device.

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