參數(shù)資料
型號： ADV7301A
廠商： Analog Devices, Inc.
英文描述： Multiformat SD, Progressive Scan/HDTV Video Encoder with Six NSV⑩ 12-Bit DACs
中文描述： 多格式統(tǒng)計(jì)，逐行掃描/ HDTV視頻編碼器與六噪聲整形⑩12位DAC
文件頁數(shù)： 42/68頁
文件大?。?/td> 1544K
代理商： ADV7301A
REV. A
–42–
ADV7300A/ADV7301A
COLOR CONTROLS AND RGB MATRIX
HD Y Color, HD Cr Color, HD Cb Color
[Subaddresses 16h–18h]
Three 8-bit wide registers at Addresses 16h, 17h, and 18h are used
to program the output color of the internal HD test pattern genera-
tor, be it the lines of the crosshatch 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.BT601–
ITU-R.BT604 standards. Table XVII shows sample color
values to be programmed into the color registers when Output
Standard Selection is set to EIA 770.2.
Table XVII. Sample Color Values for EIA 770.2 Output
Standard Selection
Sample
Color
Color Y
Value
Color Cr
Value
Color 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
[Subaddresses 03h–09h]
When the programmable RGB matrix is disabled [Address 02h,
Bit 3], the internal RGB matrix takes care of all YCrCb to YUV
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 SMPTE274M
standard (1080 i):
(
0 2126
0 7152
0 5
1 0 0722
0 5
1 0 2126
This is reflected in the preprogrammed values for GY = 13Bh,
RV = 1F0h, BU = 248h, GV = 93h, and GU = 3Bh.
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. It must be considered by the user that the color com-
ponent conversion might use different scale values. For
example, SMPTE293M uses the following conversion:
(
0 299
0 587
0 5
1 0 114
0 5
1 0 299
The programmable RGB matrix can be used to control the HD
output levels in cases where the video output does not conform to
Y
R
G
B
Cb
B Y
'
(
(
R Y
'
'
.
'
.
'
.
'
'
.
.
.
.
'
'
'
=
×
)
+
×
(
)
+
×
(
)
=
×
)
)
=
×
0 0722
Cr
Y
R
G
B
Cb
B Y
'
(
(
R Y
'
'
.
'
.
'
.
'
'
.
.
.
.
'
'
'
=
×
)
+
×
(
)
+
×
(
)
=
×
)
)
=
×
0 114
Cr
standards due to altering the DAC output stages, such as termi-
nation resistors, for example. The programmable RGB matrix is
used for external HD data and is not functional when the HD
test pattern is enabled.
To make use of the programmable RGB matrix, the YCrCb
data should contain the HSYNC signal on the Y channel only.
The RGB matrix should be enabled [Address 02h, Bit 3], the
output should be set to RGB [Address 02h, Bit 3], 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 control 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, YUV output should be enabled [Address 02h,
Bit 5]. In this case, GY [Address 05h; Address 03, Bits 0–1] is
used for the Y output, RV [Address 09; Address 04, Bits 0–1] is
used for the Pr output, and BU [Address 08h; Address 04h,
Bits 2–3] is used for the Pb output.
If RGB output is selected, the RGB matrix scaler uses the fol-
lowing equations:
R
GY
Y
G
GY
Y
GU
=
×
×
B=GY
Y +BU
If YUV output is selected, the following equations are used:
R
RV
G
GY
B
BU
=
On power-up, the RGB matrix is programmed with default values:
Address 03h: 03h
Address 04h: F0h
Address 05h: 4Eh
Address 06h: 0Eh
Address 07h: 24h
Address 08h: 92h
Address 09h: 7Ch
When the programmable RGB matrix is not functional, the
ADV7300A/ADV7301A automatically scales YCrCb inputs to
all standards supported. For SMPTE293M, the register values
are as follows:
Address 03h: 03h
Address 04h: 1Eh
Address 05h: 4Eh
Address 06h: 1Bh
Address 07h: 38h
Address 08h: 8Bh
Address 09h: 6Eh
Address 15h, Bit 3 must be set to “1” in this mode.
SD Color Control
[Subaddresses 5Ch, 5Dh, 5Eh, and 5Fh]
SD Y SCALE, SD Cr SCALE, and SD Cb SCALE are three
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 to 2.0 and the Y level from 0 to 1.5 of its initial
level. The value of these 10 bits is calculated using the equation:
RV
Cb GV
×
=
×
+
×
×
×
Cr
Cr
Cb
Y
Cb
=
=
×
×
×
Cr
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