PROBLEMS:
- Low level for signals HFCLKOUT and 32CLKOUT detected. 0.9V instead of RL-0.45=1.35V
- VMMC1 = 0; All other expected voltages are correct. No power to the SD card.
- As a result of these OMAP3 does not boot-up.
CONDITIONS:
- Unfortunately JTAG pins are not exposed, nor the TEST pins
- Boot mode MC021; BOOT0=1, BOOT1=0
- Same Chip used in previous board design, even same batch order
- Same schematic, same load
- Different PCB routing but same placement
- PCB fabrication failure ruled out as an cause by flying probe test
- The chip has been x-rayied and no soldering issues observed
- OMAP3 does not boot-up even if the SD card is separately powered with a 3V supply.
- Current drawn ~10mA from the 3V p.s.
QUESTIONS:
- What else can affect the clock output levels to drop by 50%?
- Why the VMMC1 does not appear? It is a simple LDO. Default voltage should be 3.0V based on the Boot Mode selected
Thank you in advance for your support!
