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Altera_Forum's avatar
Altera_Forum
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11 years ago

Signaltap retrieve data .... after having plugged JTAG

is it possible to plug the jtag (usb blaster or other) and retrieve captured data (aquire data a postiori) with signaltap? I mean : Program a FPGA with SignalTap, Let the board functio...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

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Because JTAG can set the FPGA into a high impedance which is catastrophic in my system, I can't allow that.

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Only if the TAP machine is programmed to issue the HIGHZ command. Its unlikely to randomly issue this command.

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I had burnt USB Blasters this way, I think.

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It should work fine. The VCC_OUT voltage from the 10-pin header goes to dual-voltage buffers that are tolerant of either supply powered before the other.

Cheers,

Dave