VESTEL 17MB12, Service Manual

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-1 analog subwoofer output
-1 analog stereo headphone output
5.3 Video Features
The TVT is a Teletext decoder for decoding World System Teletext data, as well as
Video Programming System (VPS), Program Delivery Control (PDC), and Wide-Screen
Signalling (WSS) data used for PALplus transmissions (line 23). The device also
supports Closed Caption acquisition and decoding.
The TVT provides an integrated general-purpose, fully 8051-compatible microcontroller
with television-specific hardware features. The microcontroller has been enhanced to
provide powerful features such as memory banking, data pointer, additional interrupts,
shared memory access etc.
The TVT has an internal XRAM of 32 KB and a BOOT ROM of 4 KB. For operation the
code is fetched from a 16bit FLASH, which can be addressed up to 1 MByte.
The controller with dedicated hardware does most of the internal TTX acquisition
processing, transfers data to/from external memory interface, and receives/transmits
data via I2C-bus interface. In combination with dedicated hardware, the slicer stores
TTX data in a VBI buffer of 1 KB. The microcontroller firmware performs all the
acquisition tasks (hamming and parity checks, page search, and evaluation of header
control bits) once per field. Additionally, the firmware can provide high-end Teletext
features like Packet-26 handling, FLOF/TOP and list-pages. The interface-to-user
software is optimized for minimal overhead. TVT is realized in deep submicron
technology with 1.8 V supply voltage and 3.3 V I/O (TTL compatible).
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16 analog video inputs (4xCVBS/Y/C + 3xRGB/YCrCb/YPrPb)
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Video input switch matrix
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3 analog video outputs (integrated Y+C adder)
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24-bit RGB/H/V/clk input (e.g. ext. DVI decoder) or 656 8bit input
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656 8bit input/output (e. g. for external high-end up conversion by FRCA)
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Multi-standard color decoder PAL/NTSC/SECAM including all substandards
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2D adaptive comb filter for PAL/NTSC with vertical peaking
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3D-comb filter for PAL/NTSC (Optional)
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Macrovision compliant multi-standard sync processing
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Trilevel sync slicer for HDTV
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Macrovision detection
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High-quality soft mixer controlled by Fast Blank (alpha blending)
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Fastblank monitor via I2C
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Noise measurement
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Letterbox detection (auto-wide)
•
Split screen (OSD and video side by side) and AV PIP
5.4 Controller Features
The TVT is a Teletext decoder for decoding World System Teletext data, as well as
Video Programming System (VPS), Program Delivery Control (PDC), and Wide-Screen
Signalling (WSS) data used for PALplus transmissions (line 23). The device also
supports Closed Caption acquisition and decoding.
The TVT provides an integrated general-purpose, fully 8051-compatible microcontroller
with television-specific hardware features. The microcontroller has been enhanced to