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BF533 boot up failure

Question asked by Employee on Oct 10, 2015
Latest reply on Nov 24, 2015 by Nabeel

Power down the self made board and power rails(Vdd-3.3V) could not drop to <100mV. Power up the board and most of the time the board failed to boot up, no flash read signals output from BF533.



Double checked the schematic and found BR and ARDY did not pull up with resistors. Rest signals include NMI, Reset, BMODE, clock are all checked and looks fine.

Attached reset vs VDDcore and reset vs clock power up timing.

VDD-3.3V and VDDcore rails up and down monotouneously and follow well.


Please comment if any factors will cause the boot up failure.