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Altera_Forum's avatar
Altera_Forum
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17 years ago

can't scan jtag chain in customer built board

I have a custom built board with EPM570T100C3N, this is the only programmable device in the board. The other chip is a CY68013A. The USB part of the board works well, but the CPLD cannot programmed b...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

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I have checked the power, and the connection, found no error.

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But the JTAG hardware is apparently wrong anyway.

Check with an oscilloscope, that each input signal (TCK, TMS, TDI) is arriving at the respective pin. If so, the TDO output must also show a response in initial chain test.