ADV7511 low resolution input / pixel repetition

We would like to output 320x240 60hz video from a microcontroller to a HDMI equipped monitor using the ADV7511.

It seems that the HDMI transmitter is capable of pixel repetition to increase the pixel clock to the minimum required by the standard, 25MHz, effectively outputting 640x480 in this case.

Is this possible? It's not entirely clear from the programming guide.

    •  Analog Employees 
    on Jul 18, 2019 12:44 PM over 1 year ago

    Hi,

     Please refer section4.3.4 for more details in ADV7511W programming guide at ez.analog.com/.../adv7511w-design-support-files

     Pixel repetition factor is adjusted to meet the bandwidth requirements. It is used to get the TMDS clock above the spec'd minimum of 20MHz.  When using pixel repetition the sink would need to ignore the duplicated pixels to get back down to a 320x240p60 format.  Note the AVI infoframe carries the pixel repetition information so the sink can respond correctly.

    Thanks,

    Poornima