STV3550B STMicroelectronics, STV3550B Datasheet - Page 21

• Manufacturer Part Number: STV3550B
• Manufacturer: STMicroelectronics

Specifications of STV3550B

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

STV3550
includes VBI data such as Teletext, closed caption, WSS, VPS, and sync pulses for
horizontal and vertical synchronization.
The ancillary data is stored aligned in 32-bit packets. If necessary, the packets are
completed by a filler with programmable data (060h, by default).
The parity of each field is extracted from the embedded F pulse or from the external H/V
pulse. The field can be determined as top first or bottom first by programming.
The data stream sequence for the Y, Cr or Cb samples is programmable.
D1 formats
The typical input format supported by the SDIN is 720 pixels per line and 480 lines per frame
for the 60-Hz source or 576 lines per frame for 50-Hz source (ITU-R BT.656) with a 27-MHz
pixel clock.
The D1 interface can also support other formats with a pixel clock up to 30 MHz. The input
format is given by the configuration of the interface that is programmable up to 960 pixels
per line and 1024 lines per frame.
The 3D-TNR and the Motion Estimator can be used only with standardized line length of
720 pixels per line.
Synchronization pulse extraction
The SDIN interface is able to extract either the sync pulses embedded in the data stream as
described in specification ITU-R BT.656 or external H/V pulses sent on the H/V inputs.
After extraction, the sync pulses are used to capture the data which is then sent to the Video
Timebase Generator (VTG) to synchronize the chip. Synchronization modes are described
in
The following sync pulses can be extracted and are selected using the registers:
●
●
●
●
Horizontal and vertical filter
To perform high-factor Zoom-out on a picture (from 1/4 to 1/16 of the screen) with no extra
load on the memory bandwidth, the SDIN can perform a horizontal and vertical decimation
by 2 or 4 on the input signal. This means that unused pixels are not stored in the SDRAM
and the memory bandwidth is not penalized.
Before decimation, the input signal passes through a horizontal and vertical filter to prevent
aliasing effects. The coefficient of this filter is programmable and then can be optimized for
each decimation factor. This filter and the decimator can be by-passed. The decimation
factor is selectable by programming. When the decimator is active, the 3D-TNR is by-
passed.
Section
Embedded F and H sync pulses (for the vertical sweep, and EAV or SAV pulse for the
horizontal sweep)
Embedded V and H sync pulses (rising or falling edge of the V sync pulse, for the
vertical sweep, and EAV or SAV pulse for the horizontal sweep)
External H/Vsync pulses (rising or falling edge of the external V sync pulse, for the
vertical sweep, and rising or falling edge of the external H pulse for the horizontal
sweep)
External H/Fsync pulses (rising and falling edge of the external F sync pulse, for the
vertical sweep, and rising or falling edge of the external H pulse for the horizontal
sweep)
3.2.
Video function description
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