9.6.1. Bypass register

Purpose

Bypasses the device during scan testing by providing a path between TDI and TDO.

Length

1 bit.

Operating mode

When the BYPASS instruction is the current instruction in the instruction register, serial data is transferred from TDI to TDO in the SHIFT-DR state with a delay of one TCK cycle. There is no parallel output from the bypass register. A logic 0 is loaded from the parallel input of the bypass register in CAPTURE-DR state.

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