on-board video cards
on-board video cards
Posted Sep 29, 2007 23:06 UTC (Sat) by foom (subscriber, #14868)In reply to: on-board video cards by giraffedata
Parent article: What every programmer should know about memory, Part 1
But I guess DVI designers decided the computer wants to update the picture by a full raster scan 60 times a second anyway, so there's no need for internal refresh. Doing a little reading just now, it looks like the DVI data stream is a simple raster scan. It even apparently has "blanking intervals," though they couldn't possibly be for same purpose as on a CRT.
DVI's timing and blanking intervals are the same as VGA's. I believe it was designed this way to make the modification to the video cards easier, and to facilitate dual-output DVI / VGA video cards. (so the VGA port is basically just the DVI port with an extra D2A converter in the path.)