VDP313XY datasheet(26/76 Pages) MICRONAS

26 / 76 page

VDP 313xY

ADVANCE INFORMATION

Micronas

2.12.Synchronization and Deflection

The synchronization and deflection processing is dis-

tributed over front-end and back-end. The video

clamping, horizontal and vertical sync separation and

all video related timing information are processed in

the front-end. Most of the processing that runs at the

horizontal frequency is programmed on the internal

Fast Processor (FP). Also the values for vertical and

East/West deflection are calculated by the FP soft-

ware.

The information extracted by the video sync process-

ing is multiplexed onto the hardware front sync signal

(FSY) and distributed internally to the rest of the video

processing system.

The data for the vertical deflection, the sawtooth and

the East/West correction signal is calculated in the

front end. The data is transferred to the back-end by a

single wire interface.

The display related synchronization, i.e. generation of

horizontal and vertical drive and synchronization of

horizontal and vertical drive to the video timing

extracted in the front-end, are implemented in hard-

ware in the back-end.

2.12.1. Deflection Processing

The deflection processing generates the signals for the

horizontal and vertical drive (see Fig. 2–24). This block

contains two phase-locked loops:

– PLL2 generates the horizontal and vertical timing,

e.g. blanking, clamping and composite sync. Phase

and frequency are synchronized by the front sync

signal.

– PLL3 adjusts the phase of the horizontal drive pulse

and compensates for the delay of the horizontal out-

put stage. Phase and frequency are synchronized

by the oscillator signal of PLL2.

The horizontal drive circuitry uses a digital sine wave

generator to produce the exact (subclock) timing for

the drive pulse. The generator runs at 1 MHz; in the

output stage the frequency is divided down to give

drive-pulse period and width.

The horizontal drive

uses an open drain output transistor.

Fig. 2–24: Deflection processing block diagram

phase

comparator

lowpass

PLL2

E/W

correction

sawtooth

PWM

15 bit

VERT

VPROT

PWM

15 bit

DCO

front

sync

interface

FSY

VDATA

main

sync

generator

vertical

serial

data

phase

comparator

lowpass

PLL3

1:64

output

stage

HFLB

HOUT

DCO

display

timing

line

counter

blanking, clamping, etc.

clock & control

sinewave

generator

DAC

LPF

MSY

vertical reset

skew

measure-

ment

angle &

bow

VERTQ

sync

generation

CSY

INTLC

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