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Altera_Forum
Honored Contributor
17 years agoCyclone3 Power Up level doesn't work
A design with an EP3C40F324I7 has the pin U18 as an registered output. This pin is used to control another dcdc's nSHDN (Shutdown negativ logic) The fpga is configured via epcs. this dcdc is ...
Altera_Forum
Honored Contributor
17 years ago@ gambit
in my first posting i mentioned "the register Enable_3V goes to top level and there it is connected to output pin 3VEnable" @ jake no matter if low or high, you gave me a realy good hint and i must find some time to read those manuals again. unfortunately it seems that there won't be a working solution with parts available in 0402, the startup current is too high so i must decide between no running dcdc between startupwith a too high power up current in normal operating or a short dcdc start but a smal current ramp ....