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No, TCK doesn’t have to match the CPU clock. In fact its usual speed is in kilohertz, not megahertz. However, you likely won’t see it in the oscilloscope or logic analyzer because it is driven by the JTAG probe and not the CPU. Discovering the JTAG pins requires active probing using something like JTAGulator, you are unlikely to find it via passive ...


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There are two possible ways of programming flash over JTAG in such a circuit: use JTAG boundary scan to directly bitbang flash chip pins connected to the CPU as if you connected programmer to it. This usually requires detailed mapping of chip pins to boundary scan register (e.g. BDSL file), knowledge of how the flash chip is connected to the CPU, and ...


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