STV3550 datasheet(21/144 Pages) STMICROELECTRONICS

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Video Functional Description

STV3550

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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.

3.1.1.2 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.

3.1.1.3 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

Section 3.2: Video Timebase Generator (VTG).

The following sync pulses can be extracted and are selected using the registers:

●

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).

3.1.1.4 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.

The vertical filter line-memories are limited to 720 pixels. When a line exceeds 720 pixels, the input

line must be truncated to 720 pixels by the D1 interface (configured at 720 pixels per line).

3.1.1.5 3D Temporal Noise Reduction (TNR)

When the D1 interface is set in a standard configuration (720 pixels per line and 288 or 240 lines per

field) and the decimation filter is by-passed, the luma signal can be filtered in the spatial and

temporal domain in order to reduce in-band noise. The noise reduction is based on a proprietary ST

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