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Altera_Forum's avatar
Altera_Forum
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17 years ago

Was my chip burnt ?

I tested the voltage of ASM1117 1.2V on my board, which is 2.5V, and the current is 190.2mA. Obviously, the VCCINT of cyclone2 should be 1.2v, so i doubt whether the chip was burnt. When i cut t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

That's the first time I've heard of an FPGA failure shorting then after time recovering (like a thermal fuse). Every failure I've ever seen once shorted, stayed shorted to ground.

Have you tried using JTAG to check to see if the FPGA responds?

Are you programming the FPGA at all?

One possible source of this issue, if you have a bitfile loaded in the flash device, some versions of quartus defaulted to all unused IO as output driving ground. this could potentially explain the short then recover. But only if you have some IO's connected to the 1.2 rail. (Possible, if your board pinout is compatible with all the package compatible devices. Usually the largest device has more VCC_INT than the smaller devices)

It's a long shot, but work looking into.

Pete