OPERATION PRINCIPLES
2.
OPERATION PRINCIPLES
2.1
Functional Overview
Front-end
The Front-end accepts either single composite video or separate Y and C signals. Channel
selection is handled through a video mux which is software controlled.
The Front-end is compatible with PAL B/G, NTSC M and SECAM.
PCI-bridge
The images can be scaled down randomly. By specifying starting pixel, line locations and size an
exact region can be selected. The user has to specify both the source and target fields.
The scaler controls also brightness, contrast, hue and saturation. The data can be stored in
different RGB output formats.
V s y n c h .
Y U V
S c a ler,
b r ight.,
c o n trast,
h u e ,
F r o n t e n d
a n
a lo
g
d igitizer
2 Y / C o r 4 C V B S
2 i n p u t s a n d
2 o u tputs
I/O
c o n t r o lle r
P C I-b u s
interface
G P IO
d a ta
3 2
P C I-b u s
I²C
P C I-bridge
R G B
c o n v e r ter
Figure 8