SDA9380 Micronas Intermetall GmbH, SDA9380 Datasheet - Page 43

• Manufacturer Part Number: SDA9380
• Description: Enhanced Deflection Controller And RGB Video Processor (EDDC)
• Manufacturer: Micronas Intermetall GmbH

SDA 9380 - B21
Peak dark detection (PDD) top border, bottom border, left border, right border:
Micronas
These four control items define the picture area insides the peak dark detector
is enabled. The peak dark detector is storing the lowest level of the luminance
signal. If this value is higher than the clamping level the luminance signal is
stretched towards clamping level (Black stretch function). Those parts of the
picture with a luminance signal less than 50% of nominal amplitude are get-
ting more dark.
It is possible with these four control items to screen black borders of the pic-
ture (e.g. letter box format) which otherwise prevent the desired function of
black stretch.
The following figure and table show their definitions:
Default value
Resolution
PDD bottom
border [7:0]
border [7:0]
last line of
Range
Width
PDD top
field
line=0
pixel=0
pixel
8 bit (0...255)
top border
16 (line 32)
line 0...510
border [3:0]
2 lines/bit
PDD left
PDD
5-35
vertical and horizontal blanking
bottom border
peak dark detection for
8 bit (0...255)
71 (line 284)
line 0...1020
black stretch enabled
4 lines/bit
PDD
pixel 64...304
8 (pixel 192)
4 bit (0...15)
16 pixels/bit
left border
Preliminary Data Sheet
PDD
System description
border [3:0]
PDD right
pixel 576...816
right border
8 (pixel 704)
4 bit (0...15)
16 pixels/bit
2001-05-03
PDD
pixel=863