Rev. 1.0, 02/00, page 821 of 1141
29.1.2
Block Diagram
A block diagram of the OSD appears in figure 29.1.
Sync separator
TV format
4/2fsc
Dot
clock
4/2fsc in
CVin1
4/2fsc out
H
V
Horizontal
display
position
control
Display data RAM
Vertical
display
position
control
Button control
Shift register
Border control
4/2fsc
oscillator
CVout
Halftone
control
Sync tip
clamp
SECAM
character
control
Switch-
ing
Color burst
Character, back-
ground, and cursor
color generation
Display control
Character, border,
cursor, button, and
background
R
G
B
YCO
YBO
Character data ROM
Figure 29.1 OSD Block Diagram