Re: [CAD_CAM_EDM_DRO] Imbedded computers

Stephen Wille Padnos wrote:

>The one thing that is different from most desktops is embedded video.
>Not just "video on the motherboard", but "video using shared memory
>access". This can be a problem for interrupt latency, and the CPU can't
>necessarily even tell that anything bad is happening - it gets
>effectively stopped while the video subsystem is using main memory
>
>

This could be a problem with AGP specifications 1.0 and 2.0. AGP 3.0
includes isochronous mode to address excessive delays caused by the
video subsystem. This is specifically intended to address problems
caused by AGP transactions taking excessive time away from
time-sensitive applications. This mode might fix the problem for
montion control applications as well.

I'd be interested in seeing any data you have that documents problems in
pulse generation caused by the AGP subsystem.

Dave K