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參數(shù)資料
| 型號： | 9412AVK |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | 14 X 14 MM, 2 MM HEIGHT, PLASTIC, MS-022, MQFP-80 |
| 文件頁數(shù)： | 35/126頁 |
| 文件大?。?/td> | 1673K |
| 代理商： | 9412AVK |
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DATA SHEET
16
Aug. 16, 2004; 6251-552-1DS
Micronas
2.2.6. Contrast, Brightness and Saturation Control
of Input Signal
The YUV signal can be manipulated in order to fit to
the main channel. The contrast can be adjusted
between 0 and 1.97 in 64 steps (CONADJ). The
brightness is adjustable in 255 steps (BRTADJ). Due
to the independent chroma adjustment of U and V (64
steps each, USATADJ, VSATADJ), UV as well as
CrCb input signals can both be displayed correctly.
2.2.7. Soft Mix
The soft-mixer circuit consists of a Fast Blank (FB)
processing block supplying a mixing factor k (0... 128)
achieving the output function:
k= ‘0’ means that only the main signal is fed through to
the output. k= ‘128’ means that only the inserted signal
becomes visible. The soft mixer supports four modes
that are selected by MIXOP and SMOP.
2.2.8. Static Switch mode
In its simplest and most common application the soft-
mixer is used as a static switch between YUVmain and
YUVinsert. This for instance the adequate way to han-
dle a DVD component signal. By using MIXOP, k is
internally set to 0 or 128 respectively.
2.2.9. Static Mixer mode
The signal YUVmain and the component signal YUVin-
sert may also be statically mixed. In this environment,
k is manually controlled via FBLOFFSET and MIX-
GAIN.
All necessary limitation and rounding operations are
built-in to fit the range: 0
≤ k ≤ 128
Considering MIXGAIN=3, k is obtained by
The mixing is only controlled by FBLOFFST.
In the static mixer mode as well as in the previously
mentioned static switch mode, the softmixer operates
independently of the analog fast blank input.
2.2.10. Dynamic Mixer mode
In the dynamic mixer mode, the mixer is controlled by
the Fast Blank signal. The VSPA provides a linear mix-
ing coefficient
The dynamic mode is used for mixing which is depen-
dent on FB input. FB is the preprocessed digitized fast-
blank input in the range from 0...127. FBL manipulation
is done both for luminance and chrominance FBL sig-
nal.
Fast blank is delay adjustable by FBLDEL in the range
of -2...4 clock cycles.
2.2.11. FBL Activity and Overflow Detection
It is important to know whether the FBL input is used
or not. Therefore a detection circuit gives information
via the I2C bus to the microcontroller. The circuit uses
the FBL value as input. If it is greater than a threshold
for one or five clock cycles (FBLCONF), the I2C regis-
ter FBLACTIVE is set. This register is reset after a
read access by the microcontroller. PFBL, PG, PR, PB
indicate an overflow of the corresponding ADC (upper
limit: ADC= 255) exceeding 5 clock cycles duration.
Table 2–7: RGB operation modes
MIXOP
SMOP
Soft Mix mode
00
0
Dynamic Soft Mix
(DECTWO must be set to ’1’)
00
1
Static Soft Mix
(DECTWO must be set to ’1’)
01
x
Only RGB/YUV path visible
10
x
Only CVBS path visible
11
x
(Reserved)
YUVmix
YUV
main
128
k
–
() YUV
inserted
k
+
128
---------------------------------------------------------------------------------------------
=
[κ limited to 0 and 128]
kMIXGAIN
31
FBLOFFST
–
() 32
+
=
k
158
3 FBLOFFST
–
=
k
MIXGAIN FB
FBLOFFST 2
–
()
2
------------------------------------------------------------------------------------ 64
+
=
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