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KS0127 Datasheet(PDF) 9 Page - Samsung semiconductor

No. de pieza KS0127
Descripción Electrónicos  MULTISTANDARD VIDEO DECODER/SCALER
Download  96 Pages
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Fabricante Electrónico  SAMSUNG [Samsung semiconductor]
Página de inicio  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

KS0127 Datasheet(HTML) 9 Page - Samsung semiconductor

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ELECTRONICS
KS0127B Data Sheet
MULTIMEDIA VIDEO
PAGE 9 OF 96
Modified on May/04/2000
1.1.2. Digital AGC Control
The AGC normally references to the ADC code difference between sync tip and back porch. Two sets of sync
tip-back porch ADC values are available for different AGC gain requirements: if AGCGN = 0, the sync tip locks to
code 2, and the back porch locks to code 70; when AGCGN = 1, the sync tip locks to 16, and the back porch locks
to code 70. Video signal with abnormal sync tip or very bright saturated colors may cause the ADC to limit the
maximum value. This situation can be corrected by enabling the AGCOVF bit in the CMDB register to force the
gain tracking loop to reduce AGC when maximum limiting conditions occur. The AGC may also be programmed to
freeze the AGC at the current value by setting the AGCFRZ bit in the CMDB register. Once the AGC is frozen, the
gain can be manually adjusted with the AGC register. The tracking time constant for the AGC can be controlled
with the AGC_LPG[1:0] bits in the TRACKB register. In addition, the AGC tracking time constant can be
configured as 2X faster during acquisition via the AGC_LKG.
1.1.3. Digital Video Input
The high quality digital video down scaler in the KS0127B can be directly accessed via the EXV bi-directional port.
The KS0127B accepts CCIR 656 compliant 8-bit YCbCr digital video input with embedded or external timing. Video
timing may also be generated by the KS0127B. Data path for 8-bit YCbCr input is shown in Figure 3. Selection of
analog video input or digital CCIR 656 data is with the INPSL[1:0] register bits. The KS0127B can operate in
master or slave timing mode when the chip is programmed for digital video input.
1.1.4. Pixel Clock and Timing Mode Selection for Digital Video Input
Pixel clock and synchronization timing can be individually selected to either come from an external generator or be
generated internally. In addition, if synchronization is provided by an external source, the KS0127B supports
embedded syncs as defined in CCIR 656, or TTL HS and VS inputs. Selection of pixel clock is via CKDIR bit in
Table 1: Analog Video Input selections
INSEL[3:0](hex)
Selected Input(s)
Video Type
0
AY0
Composite
1
AY1
Composite
2
AY2
Composite
4
AC0
Composite
5
AC1
Composite
6
AC2
Composite
8
AY0, AC0
S-Video
9
AY1, AC1
S-Video
A
AY2, AC2
S-Video
F
AY2(Y), AC1(Cb), AC2(Cr)
YCbCr component video


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