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Old 26 July 2011, 02:13   #135
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Originally Posted by Schoenfeld View Post
I have re-started the design from scratch, because I could not get DDR memory to work reliably (DDR can't cope with changing frequencies and is very sensitive to noise - datastrobe PLLs and 2.5V technology).

I've gone back to SDR memory, but increased the bus width to get to the same data rate (32 instead of 16 bits). Memory chip is a x32 type, saving lots of space on the board (you may know that the old version of Indivision AGA had two memory chips, but this one will only have one). Memory performance is still high enough to saturate the 165MPixel/s maximum pixelclock of the DVI encoder: Total memory performance easily exceeds 200MPixel/s (old Indivision AGA: about 105MPixel/s).

Well at least we now know why it hasn't been released yet

I think we'd all rather wait for you to get the design optimised
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