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How to Determine the Size of external SDRAM for ADV7842 decoder?

Question asked by Brett on Jan 17, 2012
Latest reply on Feb 2, 2012 by GuenterL

Different sizes for External RAM are given as 64Mb (SDR) , 128Mb (DDR), 256Mb (DDR) , 512Mb (DDR) ,

we are not using TBC function , we only need to use 3D comb filter operation , i need to know how to determine memory size,

what i am thinking is that it depends on input video resolution as well as the oversampling used ! but still i want to know the exact calculation to determine the memory size.