Cyclone II programming and verification using JTAG

I find it odd that you feel your product will not work under those conditions.

Cellular base stations exist in those (and worse) conditions on a daily basis (and they are using FPGA's). ((I assume that the board is not really directly exposed to those elements, but is in an enclosure - correct?))

Altera does not provide a method for reading back the configuration loaded into the Cyclone II FPGA for design security reasons.

You can however use a nice feature built into the Cyclone II device just for what you are looking to accomplish.

There is a chapter in the Users Guide as follows:

Section I. - Chapter 3. Configuration and Testing - Cyclone II Automated SEU Detection.

Read that section and the related Application note and all your needs should be satisfied.

Now to formally answer your questions.

Yes, it is possibleto check the device (indirectly)

You do not need to use JTAG

See the Ap note

I do not know if anyone has any source code, it should not be an issue to test a bit and decide if you need to reload the part.

Enjoy.