NEC MultiSync 75F-3 Service Manual page 54

Color monitor

Table of Contents

Composite Sync Signal Separator

Composite sync signal separator extract Vsync signal from HIN or SOGIN input pin by filtering pulses

which is less than 6us. The output Vsync signal will be widened about 5.5~6.5us. The output Hsync will

be replaced by 2us pulse during Vsync pulse.

The composite sync signal separator can handle H+V and H exclusive OR V signals. Fig. 5 shows the

timig relationship of the extracted H and V sync signals.

If Hsync output do not want to insert pseudo H pulses (EXTRHS signal) during Vsync pulse, set BYPASS

bit can let HOUT pin output waveform same as Hsync input (Note: polarity can be controlled by HOPOL

bit).

Fig.6 Timing relationship of composite sync signal separator

Table of Contents

Chapters

Table of Contents