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STM32F407I power up problem

Question asked by perlshtein.shlomo on Aug 2, 2015
Latest reply on Aug 3, 2015 by perlshtein.shlomo

I'm using the stm32f407i . BOOT0-tied to GND by 1k resistor, BOOT1 tied to VDD by an 24k resistor NRST connected by a 100nF capacitor to GND,PDR_ON is floating.
We assembled several cards: part of it operates well ,while part is not wakeup - no commination to the debugger (ST-LINK/V2 with IAR SW).
I'm not sure that leaving PDR_ON floating is OK, and didn't find a clear instruction.

Any help will be appreciated.