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Pixel clock of ADV7180

Question asked by jeevan on Feb 22, 2017
Latest reply on Feb 22, 2017 by JeyasudhaMuthuPerumal


I am using an OLED display in my project, The BT656 data from ADV7180 drives the OLED. For the purpose of testing this OLED, I configured the OLED into test mode, where it displays some test pattern using inbuilt test pattern generation circuitry(requires an external clock signal). But nothing displays in the OLED. The OLED  properly communicates with the controller used in the project and is configured correctly. The video decoder is configured to give a pixel clk of 27Mhz. But  when I probed the pixel clock of ADV7180(which is connected to the clk line of OLED), it is found varying between 26.5-27.4Mhz. Is there any way to get rid out of this clk variation. I think this condition may lead the OLED to display nothing. The clk signal viewed on the DSO is attached,