![background image](http://html1.mh-extra.com/html/texas-instruments/dm38x-davinci/dm38x-davinci_user-manual_1097067109.webp)
26
0
( )
( )
n
n
H z
h n z
−
=
=
∑
Internal Modules
109
SPRUHI7A – December 2012 – Revised June 2016
Copyright © 2012–2016, Texas Instruments Incorporated
High-Definition Video Processing Subsystem (HDVPSS)
1.2.6.2.4 Color Bar Insertion
When the CBAR register is set to 1, the input pixel data is replaced by the predefined color bar data. The
data format of the inserted color bar is 8-bit RGB as shown in
. Although the color bar data is
generated internally, its timing is based on the AVID signal so it is required to configure the
DTV_AVID_STA and DTV_AVID_STP registers appropriately.
When color bar mode is used, the color space conversion matrix should be appropriately programmed so
that it can convert the full-range RGB to the desired color format.
Table 1-35. Color Bar Table
Color
G
B
R
White
255
255
255
Yellow
255
0
255
Cyan
255
255
0
Green
255
0
0
Magenta
0
255
255
Red
0
0
255
Blue
0
255
0
Black
0
0
0
1.2.6.2.5 2× Interpolation
Three pixel components, YG, UB and VR, are applied to 2x interpolators. The interpolation is intended to
interpolate the SD input pixel which is 1x pixel rate (13.5 MHz) to the 2× clock rate (27 MHz). The
interpolator consists of 27 tap symmetric FIR with programmable coefficients. The coefficient register
format is s(0.7). The transfer function is expressed as:
Table 1-36. 2× Interpolation Filter Coefficients
Coefficients
Value
Default
h(0), h(26)
UPFC0
0
h(1), h(25)
0
0
h(2), h(24)
UPFC1
0
h(3), h(23)
0
0
h(4), h(22)
UPFC2
0
h(5), h(21)
0
0
h(6), h(20)
UPFC3
0
h(7), h(19)
0
0
h(8), h(18)
UPFC4
6/128
h(9), h(17)
0
0
h(10), h(16)
UPFC5
-20/128
h(11), h(15)
0
0
h(12), h(14)
UPFC6
78/128
h(13)
1
1