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External RAM with FSMC bus + internal crystal.

Question asked by Mikael.Elharrar on Feb 6, 2012
Hi all,

I have a problem with external RAM on FSMC bus (AHB3).
If I use the external crystal the memory works well (12 Mhz + PLL to 96Mhz ), but if I use the internal crystal at 16Mhz + PLL to 96Mhz I stay blocked in

    while((RCC->CR & RCC_CR_PLLRDY) == 0)

in system_stm32f4xx.c or go to HardFault interrupt...

Is there a known limitation AHB3/Internal crystal ?