MSM7652 Просмотр технического описания (PDF) - Oki Electric Industry

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MSM7652

NTSC/PAL Digital Video Encoder

Oki Electric Industry 

MSM7652

¡ Semiconductor

BLOCK FUNCTIONAL DESCRIPTION

1. Prologue Block

This block separates input data at the ITU Rec.656 format into a luminance signal (Y) and a

chrominance signal (Cb & Cr), and also generates information concerning sync signals

HSYNC_L, VSYNC_L, and BLANK_L.

This block separates input data at the 27 MHz YCbCr (8-bit input) format into a luminance

signal (Y) and a chrominance signal (Cb & Cr).

This block separates input data at the 13.5 MHz YCbCr (16-bit input) format into a chrominance

signal Cb and a chrominance signal Cr.

Of the processed input data, luminance and chrominance signals other than valid pixel data

are replaced by 8'h10 and 8'h80 respectively.

2. Y Limiter Block

This block limits the luminance input signal by clipping the lower limit of an input signal outside

the ITU601 Standard

• Signals are limited to YD = 16 when YD < 16.

• Signals are limited to TD = 254 when YD (input during a valid pixel period) = 255.

In other cases, signals are fed as is to next processing.

3. C Limiter Block

This block limits the chrominance signal by clipping the upper and lower limits of the input

signal outside the ITU601 Standard.

CD = 1 when CD = 0 is input during a valid pixel period.

CD = 254 when CD = 255 is input during a valid pixel period.

• Y Level Converter

Converts ITU-601 standard luminance signal level to DAC digital input level.

• U Level Converter

Converts ITU-601 standard chrominance signal level to DAC digital input level.

• V Level Converter

Converts ITU-601 standard chrominance signal level to DAC digital input level.

• YUV Color Generator

This block generates luminance and chrominance signals from over lay color signals OLR,

OLG and OLB. Control signals (CR [2:0] ) control the output content (overlay or color bar) and

output level (100%, 75%, 50%, 25%).

• Overlay Control

This block selects input image data or YUV Color Generator output signals.

It is determined by the level of the control signal (OLC, CR [2]), as shown below: (x : don't care)

CR [2] = 1, OLC = x: Selects color bar signal (YUV Color Generator output signal).

CR [2] = 0, OLC = 1: Selects overlay signal (YUV Color Generator output signal).

CR [2] = 0, OLC = 0: Selects input image data.

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