STV2310 datasheet(25/112 Pages) STMICROELECTRONICS

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STV2310

Functional Description

At the sample rate converter output, an active line is transposed into a fixed number of skew

corrected pixels, according to the selected output format (ITU-R BT.601 or square pixel). This is

used for the orthogonal display or field storage for the field-rate up-conversion, using an external

up-converter.

4.9.1.1 Square Pixel Mode

When a standard TV screen is used to display computer-generated images, Square Pixel mode is

required to ensure the correct aspect ratio in relation to the required sampling frequency of the TV

display format.

The output formatting can be performed with Normal or Square Pixel modes. For Square Pixel

mode, the number of required samples per line depends on the input standard.

4.9.1.2 Zoom-In Mode

In Zoom-In mode, a portion of the TV scan line is expanded to take all the available output samples

for that line.The zoom-in factor ranges from 1 (no zoom) to 4 (large zoom). The Zoom-In mode start

position is programmable.

Table 10: TV Display Formats

Luma Sampling Frequency

Format

Pixels/Line

13.5 MHz

ITU-R BT.601 (NTSC/PAL)

720

12.27 MHz

NTSC Square Pixel

640

14.75 MHz

PAL Square Pixel

768

Table 11: Required Samples per Line for Square Pixel Mode

Standard

Samples per Line

Y SIgnal

Cr Signal

Cb Signal

625 Lines/50 Hz

768

384

525 Lines/60 Hz

640

320

Figure 14: Zoom-In Mode

720 Samples (Y Normal Pixel Mode)

2 Examples for Zoom In Action

Programmable Offset

Input Line

Output Line

after zoom

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