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STM32CubeMX setting for STM32F7 SPI

Question asked by TONYY on Sep 17, 2016
Latest reply on Jan 2, 2017 by STM32Cube-T

I used to work on STM32F4 and now are evaluating STM32F7. When I tried to create a project with STM32F769NI with SPI. I found that I can't set the Prescaler to 2 (APB2 = 108Mhz) which will result the SPI6 to 54Mhz.
The error message is "With this Prescaler value and APB2 Clock Frequency (108.0 MHz), Baud Rate is more than : 50.0 MBit/s. 
But the datasheet clear said it can go up to 54MHz. So..
The program is wrong, datasheet is wrong or I am wrong? (SPI 6, master mode with full duplex). I also set the voltage to 3.3.