MB86294 Datasheet, PDF (71/305 Pages) Fujitsu Component Limited. – Grraphiics Controller specifications

FUJITSU LIMITED
PRELIMINARY and CONFIDENTIAL
7.2 V i d e o B u f f e r
7.2.1 Data Format
Captured graphics are stored in memory in the 16-bit/pixel YcbCr format. Video data is transformed to
the RGB format when it is displayed in the L1-layer.
31
24 23
16 15
87
0
Y1
Cr
Y0
Cb
Y0,Y1
Cr,Cb
7
6
5
4
3
2
1
0
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
C7 C6 C5 C4 C3 C2 C1 C0
7.2.2 Synchronous Control
Video graphics data is written to scan-independent memory for display. Memory for video capture is
controlled by the ring buffer method. When graphics data for one frame is ready in memory, the frame is
displayed.
If the video capture frame rate is different from the display frame rate, a frame is omitted or the same
frame is displayed continuously.
7.2.3 Area Allocation
Allocate an area of about 2.2 frames to the video capture buffer. The size of this area is equivalent to the
size that considers the margin equivalent to the double buffer of the frame. Set the starting address and
upper-limit address of the area in the CBOA/CBLA registers. Here, specify the raster start position as the
upper-limit address.
To allocate n rasters as the video capture buffer, set the upper-limit value as follows:
CBLA = CBOA + 64n X CBS
If CBLA does not match the head of a raster, video capture data is written beyond the upper limit by only 1
raster (max.). Note that if other meaningful data is held in the area, the user-intended operation is
hindered by overwriting.
For reduced display, allocate the buffer area of the reduced frame size.
MB86294/294S CORAL_LB
Graphics Controller
71
Specifications Rev. 1.0