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The JTAG tap controller enables TDO, when it's state advances to a SHIFT_DR or SHIFT_IR state. Never reaching this state (respectively not seeing TDO activated) in standard JTAG scan and similar actions most likely indicates:
- device is held in reset, because one of the supply voltages required for JTAG operation (see the manual for details)
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Volatges is ok. Core - ok and IO Bank is ok.
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is below it's reset threshold
- TMS, TCK or TDO are not connected correctly
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I'm check this many times. It's ok. I'm even solder wire direct from JTAG pin to closed via from Arria chip.
Honored Contributor
