VDP313XY datasheet(19/76 Pages) MICRONAS

19 / 76 page

ADVANCE INFORMATION

VDP 313xY

Micronas

2.10.11.Priority Decoder

The priority decoder selects between the sources

video, picture frame and analog RGB (OSD). The pic-

ture frame and the OSD can be enabled indepen-

dantly. The priority between picture frame and OSD is

selectable. The video source always has the lowest

priority. At the transitions between video and the pic-

ture frame the peaking transients can be suppressed

optionally.

For the video source the black level expander can be

activated and a fast switch between 2 settings (main/

side) for contrast, brightness and matrix values is pos-

sible.

2.10.12.Scan Velocity Modulation

The RGB input signal of the SVM is converted to Y in a

simple matrix. Then the Y signal is differentiated by a

filter of the transfer function 1

−Z−N, where N is pro-

grammable from 1 to 6. With a coring, some noise can

be suppressed. This is followed by a gain adjustment

and an adjustable limiter. The analog output signal is

generated by an 8-bit D/A converter.

The signal delay can be adjusted by

±3.5 clocks in

half- clock steps. For the gain and filter adjustment

there are two parameter sets. The switching between

these two sets is done with the same RGB switch sig-

nal that is used for switching between video-RGB and

OSD-RGB for the RGB outputs (see Fig. 2–16).

2.10.13.Display Phase Shifter

A phase shifter is used to partially compensate the

phase differences between the video source and the

flyback signal. By using the described clock system,

this phase shifter works with an accuracy of approxi-

mately 1 ns. It has a range of 1 clock period which is

equivalent to

±24.7 ns at 20.25 MHz. The large

amount of phase shift (full clock periods) is realized in

the front-end circuit.

Fig. 2–16: SVM Block diagram

Coring

Gain1

Gain2

Limiter

Limit

Delay

RGB Switch

Output

Matrix and

Shaping

Modulation

Notch

Differen-

tiator

−Z−Nx

Coring

adjustment

Gain

adjustment

Delay

adjustment

D/A

Converter

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