VDP313XY datasheet(27/76 Pages) MICRONAS

27 / 76 page

ADVANCE INFORMATION

VDP 313xY

Micronas

2.12.2.Angle & Bow Correction

The Angle & Bow correction is part of the horizontal

drive PLL. This feature allows a shift of the horizontal

drive pulse phase depending on the vertical position

on the screen. The phase correction has a linear

(angle) and a quadratic term (bow).

2.12.3.Horizontal Phase Adjustment

This section describes a simple way to align PLL

phases and the horizontal frame position.

1. With HDRV the duration of the horizontal drive pulse

has to be adjusted

2. With POFS2 the delay between input video and dis-

play timing (e.g. clamping pulse for analog RGB)

has to be adjusted

3. With CSYDEL the delay between video and analog

RGB (OSD) has to be adjusted.

4. With CSYDEL and HPOS the horizontal position of

both, the digital and analog RGB signal (from

SCART) relative to the clamping pulse has to be

adjusted to the correct position, e.g. the pedestal of

the generator signal.

5. With POFS3 the position of horizontal drive/flyback

relative to RGB has to be adjusted

6. With NEWLIN the position of a scaled video picture

can be adjusted (left, middle, center, etc; versions

with panorama scaler only).

7. With HBST and HBSO, the start and stop values for

the horizontal blanking have to be adjusted.

Note: The processing delay of the internal digital video

path differs depending on the comb filter option of the

VDP 313xY. The versions with comb filter have an

additional delay of 34 clock cycles.

2.12.4.Vertical and East/West Deflection

The calculations of the vertical and East/West deflec-

tion waveforms is done by the internal Fast Processor

(FP). The algorithm uses a chain of accumulators to

generate the required polynomial waveforms. To pro-

duce the deflection waveforms, the accumulators are

initialized at the beginning of each field. The initializa-

tion values must be computed by the TV control pro-

cessor and are written to the front-end once. The

waveforms are described as polynomials in x, where x

varies from 0 to 1 for one field.

P: a + b(x

−0.5) + c(x−0.5)2 + d(x−0.5)3 + e(x−0.5)4

The initialization values for the accumulators a0..a3 for

vertical deflection and a0..a4 for East/West deflection

are 12-bit values.

Fig. 2–25 shows several vertical and East/West deflec-

tion waveforms. The polynomial coefficients are also

stated.

In order to get a faster vertical retrace timing, the out-

put impedance of the vertical D/A-converter is reduced

during the retrace.

Fig. 2–25: Vertical and East/West Deflection Waveforms

a,b,c,d,e

0,0,1,0,0

0,0,0,0,1

0,0,1,1,1

East/West:

a,b,c,d

0,1,0,0

0,1,1,0

0,1,0,1

Vertical:

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