參數(shù)資料
型號(hào)： ADV7330
廠商： Analog Devices, Inc.
英文描述： Multiformat 11-Bit Triple DAC Video Encoder
中文描述： 多格式11位DAC的視頻編碼器三
文件頁(yè)數(shù)： 40/76頁(yè)
文件大?。?/td> 1378K
代理商： ADV7330
REV. B
–40–
ADV7330
COLOR CONTROLS AND RGB MATRIX
HD Y Level, Cr Level, Cb Level
[Subaddress 16h–18h]
Three 8-bit wide registers at Addresses 16h, 17h, 18h are used to
program the output color of the internal HD test pattern genera-
tor, whether it is the lines of the cross hatch pattern or the uniform
field test pattern. They are not functional as color controls on
external pixel data input. For this purpose, the RGB matrix is used.
The standard used for the values for Y and the color difference
signals to obtain white, black, and the saturated primary and
complementary colors conforms to the ITU-R BT.601-4 standard.
Table VII shows sample color values to be programmed into the
color registers when output standard selection is set to EIA 770.2.
Table VII. Sample Color Values for EIA770.2 Output
Standard Selection
Sample
Color
Y Value
CR Value
CB Value
White
Black
Red
Green
Blue
Yellow
Cyan
Magenta
235 (EB)
16 (10)
81 (51)
145 (91)
41 (29)
210 (D2)
170 (AA)
106 (6A)
128 (80)
128(80)
240 (F0)
34 (22)
110 (6E)
146 (92)
16 (10)
222 (DE)
128 (80)
128 (80)
90 (5A)
54 (36)
240 (F0)
16 (10)
166 (A6)
202 (CA)
HD RGB Matrix
[Subaddress 03h–09h]
When the programmable RGB matrix is disabled [Address 02h,
Bit 3], the internal RGB matrix takes care of all YCrCb to YPrPb
or RGB scaling according to the input standard programmed
into the device.
When the programmable RGB matrix is enabled, the color
components are converted according to the 1080i standard
[SMPTE 274M]:
Y
R
CB
CR
'
[ . / (
=
0 5
1 0 2126
G
)](B Y
)](R Y
B
'
[ . / (
0 5
'
1 0 0722
'
'
'
')
')
=
+
+
=
0 2126
0 7152
0 0722
This is reflected in the preprogrammed values for GY = 138Bh,
GU = 93h, GV = 3B, BU = 248h, RV = 1F0.
If another input standard is used, the scale values for GY, GU,
GV, BU, and RV have to be adjusted according to this input
standard. The user must consider that the color component con-
version might use different scale values. For example, SMPTE
293M uses the following conversion:
Y
R
CB
CR
'
[ . / (
=
0 5
1 0 299
G
B
')
')
'
.
[ . / (
0 5
'
.
'
.
'
'
.
)](B Y
)](R Y
=
+
1 0 114
+
=
0 299
0 587
0 114
The programmable RGB matrix can be used to control the HD
output levels in cases where the video output does not confirm
to standards due to altering the DAC output stages such as
termination resistors. The programmable RGB matrix is used
for external HD data and is not functional when the HD test
pattern is enabled.
Programming the RGB Matrix
The RGB matrix should be enabled [Address 02h, Bit 3], the
output should be set to RGB [Address 02h, Bit 5], Sync on PrPb
should be disabled [Address 15h, Bit 2], and Sync on RGB is
optional [Address 02h, Bit 4].
GY at addresses 03h and 05h controls the output levels on the
green signal, BU at 04h and 08h the blue signal output levels, and
RV at 04h and 09h the red output levels. To control YPrPb output
levels, YPrPb output should be enabled [Address 02h, Bit 5].
In this case, GY [Address 05h; Address 03, Bit 0–1] is used for
the Y output, RV [Address 09h; Address 04, Bit 0–1] is used for
the Pr output, and BU [Address 08h; Address 04h, Bit 2–3] is
used for the Pb output.
If RGB output is selected, the RGB matrix scaler uses the
following equations:
=
×
+
×
+
×
=
×
+
×
=
×
+
×
Pr
If YPrPb output is selected, the following equations are used:
G
B
R
GY
GY
GY
Y
Y
Y
GU
BU
RV
Pb
Pb
GV
Pr
Y
U
V
GY
BU
RV
Y
Pb
=
=
=
×
×
×
Pr
On power-up, the RGB matrix is programmed with default values.
Table VIII. RGB Matrix Default Values
Address
Default
03h
04h
05h
06h
07h
08h
09h
03h
F0h
4Eh
0Eh
24h
92h
7Ch
When the programmable RGB matrix is not enabled, the
ADV7330 automatically scales YCrCb inputs to all standards
supported by this part.
SD Luma and Color Control
[Subaddresses 5Ch, 5Dh, 5Eh, 5Fh]
SD Y SCALE, SD Cr SCALE, and SD Cb SCALE are 10-bit
wide control registers to scale the Y, U, and V output levels.
Each of these registers represents the value required to scale the
U or V level from 0.0 to 2.0, and the Y level from 0.0 to 1.5 of
its initial level. The value of these 10 bits is calculated using the
following equation:
Y U or V ScalarValue
For example:
Scale factor = 1.18
Y, U, or V Scalar Value
= 1.18
×
512 = 665.6
Y, U, or V Scalar Value
= 665 (
rounded to the nearest integer
)
Y, U, or V Scalar Value
= 1010 0110 01
b
Scale Factor
,
,
=
×
512
Address 5Ch, SD LSB Register = 15h
Address 5Dh, SD Y Scale Register = A6h
Address 5Eh, SD V Scale Register = A6h
Address 5Fh, SD U Scale Register = A6h
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