ZR36016
INTEGRATED COLOR SPACE / RASTER-TO-BLOCK CONVERTER
PRELMINARY
FEATURES
■ Raster-to-block and block-to-raster conversions with strip
■ Supports filtering for image format conversions.
buffer of external SRAMs.
■ Horizontal decimation/interpolation with optional filtering and
vertical decimation/interpolation by line dropping or
replication.
■ Color space conversions of RGB to/from YCbCr or YeMaCy.
■ Supports Fast Preview expansion and Lossless Compres-
sion/Expansion modes of the ZR36050.
■ Enable function of pixel I/O buses for asynchronous
applications.
■ Exclusive dual pixel buses. Separate format and color space
conversions on the ZR36050 data and output data during
compression and expansion.
■ Sequential processing mode simplifies motion JPEG
implementation.
■ Supports 4:4:4, 4:4:4:4, 4:2:2, 4:1:1 and 1:0:0 I/O formats.
■ Provides windowing function to select processing area.
■ TTL levels for Input/Output.
■ Supports many format conversions between pixel input bus
and pixel output bus, pixel input bus and ZR36050, and
ZR36050 and pixel output bus.
■ 160 pin PQFP.
DESCRIPTION
The ZR36016 is a pre- and post-processor for use with a
ZR36050 JPEG Image Codec, performing raster-to-block reor-
dering and color space conversion.
SRAM size and the mode of operation, the maximum line length
can be up to 64K pixels. The number of lines per image can be
up to 64K.
The ZR36016 accepts input pixels in a variety of common color
spaces. The pixel data can undergo format and color space con-
version, with converted data available on the pixel output bus
(Figure 1). When compressing, the data fed to the ZR36050 can
be cropped within a selected window area, and its format can be
different from that of the pixel output bus. For instance, it is
possible to output an RGB(4:4:4) input onto the pixel output bus
and to feed the ZR36050 with a YbCr(4:2:2) format. It is also
possible to output a YCbCr(4:2:2) format input as RGB(4:4:4)
and to feed the ZR36050 with a YCbCr(4:1:1) format. During
expansion, for instance, the ZR36016 can output an RGB(4:4:4)
input directly onto the output pixel bus, and after converting YCb-
Cr(4:2:2) format coming from the ZR36050 into RGB(4:4:4), it
overlays it in a window on the pixel input data.
Processing of data on the pixel buses can be continuous as
required for live frame capture or Motion JPEG, or it can be dis-
continuous, with pixels transferred only when enabled by an
enable signal.
The data transfer rate with the ZR36050 is at a maximum of
30 MHz, the system clock rate. The pixel buses transfer at a
maximum of 30 MHz for 4:0:0, or at a frequency ratio of 1, 1/2 or
1/4 of the system clock for the other formats, depending on the
format conversions that are selected.
As shown in Figure 2, the input pixel data pass through a multi-
plexer, to the color space convertor. In compression, this
multiplexer always passes the pixel data (the top input). The
output of the color space convertor takes two paths in compres-
sion, one to the pixel output bus and the other to the raster to
block convertor. The data on each path can independently
undergo format conversion, which in this context means a reso-
lution transformation by decimation or interpolation, of the
chrominance components; for example, decimation from
The ZR36016 uses an external SRAM double-strip buffer for
raster-block conversions and block interleaving. The Fast
Preview and Lossless modes of operation of the ZR36050 are
also supported, in which case the SRAM is used only for raster-
to-raster buffering and pixel interleaving. Depending on the
Color Space Conversion
Format Conversion
Color Space Conversion
Format Conversion
PXIN
PXOUT
PXIN
PXOUT
Window Management
Raster-to-Block
Window Management
Block-to-Raster
ZR36050
ZR36050
Compression
Expansion
Figure 1. ZR36016 Operations with a ZR36050
ZORAN Corporation ■ 1705 Wyatt Drive ■ Santa Clara, CA 95054 ■ (408) 986-1314 ■ FAX (408) 986-1240
July 1995
This document was created with FrameMaker 4.0.4
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