FAQ: What is BYPASS?

Filed under FAQ / JTAG IEEE 1149.1

Q: What is BYPASS?


BYPASS is mandatory IEEE 1149.1 JTAG instruction which bypasse device (i.e. device is not active in JTAG chain). The BYPASS instruction is always "all-ones" instruction in order to allow bypassing unknown devices. There are some very rare devices which do not support this instruction and they will not likely work in JTAG chain.

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