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Altera_Forum
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17 years ago

Cyclone III problem with USB blaster JTAG communication

Hi all I've spent the last week debugging the jtag connection between the fpga and the usb blaster.:mad: I finally found something that is wrong.:) In JTAG there are 4 signals.. The fi...
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Altera_Forum
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17 years ago

The previous discussion wasn't related to any Altera Dev Kit, as far as I understand.

However, I don't think, that the signals at CIII Starter Kit are connected wrong. The signal naming is somewhat confusing (different from other schematics). Regarding JTAG chain continuity, you have also to consider the HSMC JTAG connection. I actually don't see P/U and P/D resistors, minimal resistors are provided at the FPGA internally, mainly TCK may need a lower resistance P/D to prevent from configuration failure on some boards that have strong crosstalk.

I'm referring to the CIII_Starter_Kit-v7.2.0 doc from Altera FTP, you possibly have a different schematics, cause the page numbering seems to be divergent.