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전자부품 반도체 검색엔진( 무료 PDF 다운로드 ) - 데이터시트뱅크

MSM7650 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7650
OKI
Oki Electric Industry OKI
MSM7650 Datasheet PDF : 34 Pages
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¡ Semiconductor
MSM7650
BLOCK FUNCTIONAL DESCRIPTION
Y Limitter
This block limits the contents outside the specified range as follows for input luminance signal
YD specified by the ITU-601 standard.
• Signals are limited to YD = 235 when YD_IN > 235
• Signals are limited to YD = 16 when YD_IN < 16
• In other cases, signals are fed as is to next processing
C Limitter
This block limits the contents outside the specified range as follows for input chrominance
signals specified by the ITU-601 standard.
The input chrominance signal is output as a 2’s complement format.
The processing procedure follows.
1) Format processing for input chrominance signals
• If MR [6] = 0, CD is in offset binary format. CD is converted to 2’s complement format and is
fed to next processing.
• If MR [6] = 1, CD is in 2’s complement format. CD is fed as is to next processing.
2) Clipping processing
• Signals are limited to CD = 112 when CD>112
• Signals are limited to CD = -112 when CD < -112
• In other cases, signals are fed to next processing
In addition, this block separates U and V components from the input chrominance signal CD into
which data of U and V components has been inserted using time sharing, and then passes signals
to the next process.
• Y Level Converter
Converts ITU-601 standard luminance signal level to DAC digital input level.
• U Level Converter
Converts ITU-601 standard chrominance signal level to DAC digital input level.
• V Level Converter
Converts ITU-601 standard chrominance signal level to DAC digital input level.
• YUV Color Generator
This block generates luminance and chrominance signals from over lay color signals OLR,
OLG and OLB. Control signals (CR [2:0] ) control the output content (overlay or color bar) and
output level (100%, 75%, 50%, 25%).
• Overlay Control
This block selects input image data or YUV Color Generator output signals.
It is determined by the level of the control signal (OLC, CR [2]), as shown below:
CR [2] = 1, OLC = ?: Selects color bar signal (YUV Color Generator output signal).
CR [2] = 0, OLC = 1: Selects overlay signal (YUV Color Generator output signal).
CR [2] = 0, OLC = 0: Selects input image data.
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