MB86293 Datasheet, PDF (58/285 Pages) Fujitsu Component Limited. – Grraphiics Conttrrollllerr Speciiffiicattiions

FUJITSU LIMITED
PRELIMINARY and CONFIDENTIAL
Coral scans the logical graphics space as if the entire space is rolled over in both the horizontal and
vertical directions. Using this function, if the display frame crosses the border of the logical graphics
space, the part outside the border is covered with the other side of the logical graphics space, which is
assumed to be connected cyclically as shown below:
Logical Frame Origin
64 w
Additionally
drawn area
L
Previous display
origin
New display origin
Fig. 5.3 Wrap Around of Display Frame
The expression of the X and Y coordinates in the frame and their corresponding linear addresses (in
bytes) is shown below.
A(x,y) = x × bpp/8 + 64wy (bpp = 8 or 16)
The origin of the displayed coordinates has to be within the frame. To be more specific, the parameters
are subject to the following constraints:
0 ≤ DX < w × 64 × 8/bpp (bpp = 8 or 16)
0 ≤ DY < H
DX, DY, and DA have to indicate the same point within the frame. In short, the following relationship
must be satisfied.
DA = OA + DX × bpp/8 + 64w × DY (bpp = 8 or 16)
MB86293 CORAL_LQ
Graphics Controller
58
Specifications Rev. 1.1