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Altera_Forum
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17 years ago

EPCS4 Programming Errors

I am having trouble programming an EPCS4 via a USB-Blaster cable. When I use the programmer to program the EPCS4 it reports that the device programs successfully, but the 'Verify' step always fails. ...
Altera_Forum's avatar
Altera_Forum
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17 years ago

It does look like the altasmi_parallel megafunction would allow me to reset the protection bits, but I'm not sure how to get it into my design. The board I am working with does not have a JTAG interface, so the only way I can configure the Cyclone is via the EPCS4 chip. This is why I was looking for a way to reset these bits via the Programmer or some other software.

I considered programming another Cyclone board I have with the altasmi_parallel megafunction and connecting it to the EPCS4 via the 10-pin interface, but I don't see how I can do this the way the megafunction is constructed (there are no ASDI, nCS, DCLK or DATA ports).

So I guess I'm left with either writing my own interface for the second Cyclone board using the timing specified in the Configuration Handbook or else trying to hack-on a JTAG interface to the board I'm using.

Is there really no way using Quartus-II to reset these protection bits without having to program the FPGA itself first?