Details of the Paging Mechanism
Very much like a CPU Virtual Memory System
- Operates on 4KB pages
- 32x32 true-color pixels
- Smaller textures can be combined into a single page
- True size of data in page is used to determine transfer size on AGP bus
- Manages up to 256MB of texture data
- 8 bytes per page of page table overhead
- 256MB uses 512KB of onboard memory
- True Demand Paged Texture Management
- Textures do not need to be completely resident on the graphics card
- Only accessed pages are brought down to the graphics card
- Textures do not need to be physically contiguous
- Not in onboard memory
- Not in system memory
- No CPU Intervention Required
- Autonomous DMA engine automatically loads pages into on-board working set
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