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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

An interesting phenomenon indeed. Real-time ISP basically means, that the existing MAX II design is not halted during programming. Thus in your hardware design, something seem to affect MAX II programming, if the design is halted, sounds odd. It may be a power supply related problem or due to some special hardware connected to the MAX II. Not a common problem, I think.