MB86296 Datasheet, PDF (68/352 Pages) Fujitsu Component Limited. – PCI Graphics Controller Specification

FUJITSU LIMITED PRELIMINARY AND CONFIDENTIAL
6.2. Frame Management
6.2.1. Single Buffer
The entire or partial area of the drawing frame is assigned as a display frame. The display field
is scrolled by relocating the position of the display frame. When the display frame crosses the
border of the drawing frame, the other side of the drawing frame is displayed, assuming that the
drawing frame is rolled over (top and left edges assumed logically connected to bottom and
right edges, respectively). To avoid the affect of drawing on display, the drawing data can be
transferred to the Graphics Memory in the blanking time period.
6.2.2. Double Buffer
Two drawing frames are set. While one frame is displayed, drawing is done at the other frame.
Flicker-less animation can be performed by flipping these two frames back and forth. Flipping is
done in the blanking time period. There are two flipping modes: automatically at every scan
frame period, and by user control. The double buffer is assigned independently for the L2, L3,
L4, L5 layers.
6.3. Memory Access
6.3.1. Memory Access by host CPU
Graphics memory is mapped linearly to host CPU address field. The host CPU can access the
Graphics memory like a SRAM.
6.3.2. Priority of memory accessing
The priority of Graphics memory accessing is the follows:
1. Refresh
2. Video Capture
3. Display processing
4. Host CPU accessing
5. Drawing accessing
MB86296S<Coral-PA>
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Specification Manual Rev0.1