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STM32F429I-DISCO Pixel Clock Problem

Question asked by senturk.babur on Jun 10, 2014
Latest reply on Jun 23, 2014 by Clive One
Hi all.
For my project i should increase the pixel clock(dot clock) frequency that sourced from PLLSAI. So i should drive 800x480 TFT panel. And when i increase the LCD TFT Clock from PLLSAI module, its amplitude decreases linearly. It doesn't matter, TFT is connected or not, or TFT is 320x240 or another. It seems, there is a problem with my configuration or silicon.
For my project i have to use Minimum 33MHz pixel clock so pixel clock directly influence LCD Refresh Rate. Any idea?
Note: I have two DISCO boards. One of them is original board (TFT and CPU Voltage) is same result. And another one is D3 diode shorted to power with 3v3 and My custom 800x480 TFT. Anyway, both of them gives same frequency amplitude problem. Also Helloworld applications and my custom application gives same result.
Thanks.

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