MB86294 Datasheet, PDF (53/305 Pages) Fujitsu Component Limited. – Grraphiics Controller specifications

FUJITSU LIMITED
PRELIMINARY and CONFIDENTIAL
5.2 F r a m e M a n a g e m e n t
5.2.1 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.
5.2.2 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.
5.3 M e m o r y A c c e s s
5.3.1 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.
5.3.2 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
MB86294/294S CORAL_LB
Graphics Controller
53
Specifications Rev. 1.0