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That was good info. The supply voltages are good. And the supply rail impedance is practically 0. So maybe the chip's alright
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This information is inconsistent. If an ohm-meter indicates 0-Ohms between the core voltage and ground, then its a short, and you would not see a voltage when you turn the supply on. (You be making the impedance measurement with the power off).
The I/O impedance can sometimes be close to 0-ohms if you have a lot of bus terminations, but for this test, you just want to look at the core.
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When I step through the JTAG state machine in the debugger, I don't see TCK or TDI change. TDO and TMS do change, but they only fluctuate between ~0.7V and 0.9V. (I'm expecting 2.5V)
So I'm thinking the USB-Blaster that I bought on eBay is the problem. Cheap Chinese knockoff...
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That definitely sounds like an issue. The Terasic USB-Blasters are cheaper than the Altera ones, and I've never had a problem with them.
Cheers,
Dave
Honored Contributor
