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Altera_Forum's avatar
Altera_Forum
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13 years ago

FPGA instability after reset

Hi all, I am working with a custom Cyclone IV E based HW that is suffering from strange startup instability. The HW runs fine under various stress tests and temperature ranges when programmed...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

The bootloader which runs from internal ram copies the actual firmware from EPCS flash to external SDRAM and jumps to its start address.

The problem is not in the bootloader or firmware code, they run just fine when downloaded through JTAG and most of the time after power

on or reset. Just sometimes it happens that shortly after reset (toggling nCONFIG with a switch in my case) the system freezes. This happens

on the cusom HW I work on, I didn't observe such behaviour on my developement kit.