STI5107 STMicroelectronics, STI5107 Datasheet - Page 10

• Manufacturer Part Number: STI5107
• Description: Low-cost Interactive Set-top Box Decoder
• Manufacturer: STMicroelectronics

Architecture features
2.7.3
2.7.4
2.7.5
2.8
10/14
Display mixing
Display planes are mixed by the blitter using alpha blending between planes. Mixing of the
OSD plane with the lower layers is achieved using one of the following on a per region basis.
●
●
●
Digital video output
The display provides a digital video output, that supports both CCIR601 and CCIR656
modes.
Genlocking
Genlocking locks the STx5107 OSD to an incoming analog signal. The RGB signals contain
OSD that can be overlaid on top of analog CVBS, allowing single OSD for both digital and
analog reception. The OSD active signal can be used as a fast blanking signal to switch
between CVBS and RGB, as illustrated in
The STx5107 does not require any external PLL to lock its own pixel clock. It uses its own
internal PLL, which reduces the overall BOM.
Figure 8.
Digital encoder
The digital converter process YCbCr 4:4:4/4:2:2 from main memory, which the blitter has
generated and produces standard analog baseband PAL/SECAM/NTSC signal, and
component (YUV/RGB).
The digital encoder can handle interlaced mode in all standards. ITU-T 601 aspect ratio
displays can be supported in all standards. The digital encoder performs closed-caption,
CGMS, WSS, Teletext and VPS encoding and allows Macrovision™ 7.01/ 6.1 copy
protection.
One integrated quad-DAC provides four analog TV outputs, on which it is possible to output
either (CVBS + RGB) or ( CVBS + YUV) or (S - VHS (Y/C) + CVBS1 + CVBS2).
from analog
CVBS
tuner
A 4-bit alpha blending component per region (true color mode and palette mode
without antialiasing enabled).
An individual 6-bit alpha component per color (palette mode with antialiasing enabled).
Alpha with pixel (ARGB1555 or ARGB4444, true color mode only).
Genlock support STi5107
Extractor
Sync
HSync
VSync
27 MHz
Xtal
Figure
8.
STi5107
incoming CVBS
Genlocked to
OSD
active
RGB
STi5107