Title: what's the meaning of 'Graphics Aperture' in AGP?

I am a newbee in dri.
Now i am reading agp source code in linux kernel.
I am not clear about 'Graphics Aperture'
I download AGP spec 2.0,but it don't say a word about it.
what's the relationship between the aperture with graphics memory?
thanks for any comment or replyBest Regards,


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