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°VMA
VMA
i
s the bias value which makes ·the window area set to the respective
display area
.
VRAM
c
T
~DAt-*
-
- - - -.,
I
I
L _
A
I
I
Area respective to
the display screen
VAD
VMA -
VAD
WDA
In
other words, the area A which
begins with WDA is displayed in
the area
B
which begins with
VAD.
SAD
is the display start
addr
e
ss to
he
set to
GDC.
Fig.lS
-
6
°VDS
VDS controls the VRAM plane output.
\
bit
2
1
0
VDS
I I
I
' \
1:
For the plane
R
or one plane
For the plane
G
For the plane
B
As shown above, VDS has
three bits for
ea'
c h window which are used
to
perform any plane display or overlaid display of two or three planes.
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