Honored Contributor
Honored ContributorI think I burned my EP2C8 208 :( past 2 days I was making this 2.5V VCCIO and problem was with my self soldered byteblaster II (LTP port) it just didn't worked on these 2.5V so it took me 2 days of soldering (I added adition 74hc244 buffer for 2 output lines and put additional 5V power supply to byteblaster to make 5V signal out of 2.5V signal that was going to parallel port and when BBII was working I add this test circuit and something happened :confused:
my oscillator showed 4,5V on VCCIO instead of 2.5V supply so now it is something wrong with L5973d DC-dc converter it now makes 4,5V (also all my led test diodes burn out (too high voltage :( ) I adjusted L5973d regulator to 1,2V and gived out 0.8V so abviously there is somthing wrong with it but now fpga was not heating up, also Core voltage VCCINT powers suply brake down and was makng 2.4V (insted of 1.2V) but I found problem and now it gives 1.2V so I have only one DC regulator broken. I don't know what really happened maybe it was static discharge that brake all. luckily I have second fpga board wich I also switched to 2.6V and I hope it will work. Can cyclone II survive VCCINT 2.4V and VCCIO 4.5-5V ???
