Features: ·Raster-to-block and block-to-raster conversions with strip buffer of external SRAMs.
· Color space conversions of RGB to/from YCbCr or YeMaCy.
·Supports Fast Preview expansion and Lossless Compres sion/Expansion modes of the ZR36050.
·Exclusive dual pixel buses. Separate format and color space conversions on the ZR36050 data and output data uring
compression and expansion.
·Supports 4:4:4, 4:4:4:4, 4:2:2, 4:1:1 and 1:0:0 I/O formats.
·Supports many format conversions between pixel input bus and pixel output bus, pixel input bus and ZR36050, and
ZR36050 and pixel output bus.
·Supports filtering for image format conversions.
·Horizontal decimation/interpolation with optional filtering and vertical decimation/interpolation by line dropping or
replication.
·Enable function of pixel I/O buses for asynchronous applications.
·Sequential processing mode simplifies motion JPEG implementation.
·Provides windowing function to select processing area.
·TTL levels for Input/Output.
·160 pin PQFP.Specifications
| Storage Temperature. |
-40 to +125 |
| Supply Voltage to Ground |
-0.3V to +7.0V |
| DC Output Voltage. |
-0.3V to VDD+0.3V |
| DC Input Voltage |
-0.3V to VDD+0.3V |
| DC Input Current, any single input |
-10 mA to +10 mA |
| DC Output Current, any single output |
-20 mA to +20 mA |
NOTE: Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may
cause permanent device failure. Functionality at or above those limits is
not implied. Exposure to absolute maximum ratings for extended periods
may affect device reliability.DescriptionThe 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.
The ZR36016 accepts input pixels in a variety of common color spaces. The pixel data can undergo format and color ace 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 s. 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 bCr(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 tput 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 indow on the pixel input data.
The ZR36016 uses an external SRAM double-strip buffer for raster-block conversions and block interleaving. The Fast w and Lossless modes of operation of the ZR36050 are also supported, in which case the SRAM is used only for rasterto-raster buffering and pixel interleaving. Depending on the SRAM size and the mode of operation, the maximum line ngth can be up to 64K pixels. The number of lines per image can be up to 64K.
Processing of data on the pixel buses can be continuous as required for live frame capture or Motion JPEG, or it can be discontinuous, 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, ending 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 of ZR36016 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
ZR36016 Data Sheet
