ZR36016 Просмотр технического описания (PDF) - Zoran Corporation

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ZR36016

INTEGRATED COLOR SPACE / RASTER-TO-BLOCK CONVERTER

Zoran Corporation 

Integrated Color Space / Raster-To-Block Converter

YCrCb(4:4:4) to YCrCb(4:2;2). Format convertor #2 can perform

decimation or interpolation of chrominance, while format conver-

tor #1 can perform decimation in compression. In addition, data

passing through format convertor #1 to the raster to block con-

vertor can be decimated globally by 2, vertically and/or

horizontally, to implement half-screen or quarter-screen

compression.

In expansion, format convertor #2 can perform global horizontal

and/or vertical interpolation, as well as interpolation of chromi-

nance components. Its output is multiplexed with the pixel input

bus, so that the pixel output bus contains the expanded data

within a window on the input data. The color space convertor is

switched in or out as required, simultaneously with the multiplex-

ing of its input, so that the color space of the expanded data is

independent of that of the input.

By means of the delay element shown, the processing pipeline

delay from pixel input to output is kept constant even when color

space conversion is bypassed. The input horizontal and vertical

synchronization signals are output after undergoing an identical

delay.

The mode of operation of the ZR36016 and operating parame-

ters are determined by the control registers, which are

programmed from the host interface. There are two modes of

controlling compressions and expansions: single frame mode

and sequential mode. In the single frame mode, the ZR36016

performs the desired process on a single frame (or field in case

of interlaced motion video) and goes idle until explicitly com-

manded to perform another process. In sequential mode, a new

process starts automatically every frame or field if enabled. The

sequential mode is most suitable for motion JPEG.

VIN

HIN

PXIN

DATA

ADD

RD

WR

CS

Delay

Delay

Color Space

Converter

MUX

Format

Converter #2

Control

Registers

Format

Converter #1

Sub-Buffer

Raster/Block Converter

COMP

STOP

BDATA

DSYNC

EOS

Figure 2. ZR36016 Block Diagrams

VOUT

HOUT

SYSCLK

PXCLK

PXEN

PXOUT

PXOE

START

RESET

FBSY

WINDOW

CBSY

MDATA

MADD

MWE

MOE

2

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