On average, we need a refresh about every 7.8 microseconds. (This refreshes one row.) A 60Hz screen refresh is every 16.7 milliseconds. Not fast enough, and you can't do more than 8 in a row. At [EMAIL PROTECTED], you get a scanline every 31.7 microseconds (not all of which are active video). (Of course, at that resolution, we take a small fraction of that time to actually read the scanline from memory.)
On 8/17/06, Koen De Vleeschauwer <[EMAIL PROTECTED]> wrote:
> With this design, memory refreshes can be > postponed in favor of video reads. As long as the average > refresh rate remains constant, there won't be any problems. Maybe I'm missing something, but why not issue a memory refresh during vertical sync? Is there any advantage in postponing a refresh to a moment when pixels are being output? regards, koen
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