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MCD212 Datasheet(PDF) 63 Page - Motorola, Inc

Part # MCD212
Description  Video Decoder and System Controller(with JTAG)
PDF  87 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MCD212 Datasheet(HTML) 63 Page - Motorola, Inc

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MCD212
8–4
MOTOROLA
Mixing is applied to image planes A and B. They are weighted and added (see Figure 8–6). The
weighting and adding is done preserving the black level (level 16):
AB = lim[ (A ) 16) * WEIGHT_A/64 + (B) 16) * WEIGHT_B/64 + 16 ]
When the result exceeds level 255, the result is fixed at 255. When the result is less than level 0, the
result is fixed at 0. Planes A and B are made transparent for overlay by making them black.
+
PLANE A
BLACK (16)
MUX
A
X
BL_A
WEIGHT_A
(0
…63)
PLANE B
BLACK (16)
BL_B
MUX
X
B
MUX
MUX
DAC
CUR
CURSOR
BACKDROP
WEIGHT_B
(0
…63)
AB
(0
…255)
VDSC
VSD
VSA
BD
EXTERNAL
VIDEO
ANALOG
SWITCH
Figure 8–6. Overlay and Mixing — One Color Component
Weight factors are programmed via the weight registers. The weight factors can be dynamically
changed by the region control registers at the position they indicate.
Backdrop and cursor can be overlaid on the combined planes A and B.
During horizontal and vertical blanking of the video a constant level is set on each component.
For 50 Hz display this level is 16 and for 60 Hz display 0.



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