Compression Processor. AT76C101 Datasheet

AT76C101 Datasheet PDF, Equivalent


Part Number

AT76C101

Description

JPEG Image Compression Processor

Manufacture

ATMEL Corporation

Total Page 13 Pages
PDF Download
Download AT76C101 Datasheet


AT76C101 Datasheet
Features
Compatible with the JPEG Baseline Standard as Defined by ISO IS 109 18-1
Highly-integrated, Low-cost Single Chip Solution
Up to 40 Mbytes/sec Sustained Compression Rate
Maximum Processing Rate of 1.6 million pixels/sec
Supports 8-bit Grayscale and YUV 4:2:2 Color Space Input and Output Formats
Handles Images of Size up to 1024 x 1024 Pixels
Fast DCT/IDCT Processor On-chip
User-defined Quantization and Huffman Tables
Support for Fast as well as Slow/Inexpensive Memories
Provides Direct Interface for Microcontroller/Microprocessor Access
Applications
The AT76C101 JPEG Processor is optimized for use in the following applications:
• Digital Cameras
• Color Printers and Plotters
• Low-cost Image Compression Systems
• Video Editing (3-4 frames/sec at CCIR 720 x 480 Image Resolution)
Hardware Resources
• On-chip Video Interface
• Custom Discrete Cosine Transform and Quantization Processor
• Variable Length and Huffman Encoder/Decoder
• Programmable Memory Interface (Supports Slow Memories)
• Microcontroller/Microprocessor Access Bus
Pin Configuration
100-Pin QFP
SRDATA15-0
SRADDR14-0
PXWE
PXRE
PXIN
PXOUT
STOP_PIXEL
SRDRIVE
H_SYNC
V_SYNC
PX_CLK
CLK_IN
M_ADDR19-0
M_DATA7-0
MEM_CS
TEST
RESET
FRAMEND
FREEZE
MASTER_CS
MASTER_WR
MASTER_OE
BUSY
BST_TEST
JPEG Image
Compression
Processor
AT76C101
Rev. 0751A–04/98
1

AT76C101 Datasheet
Description
The AT76C101 is an Image Compression/Decompression
Processor that performs the JPEG Baseline Algorithm. The
system is capable of high quality compression and decom-
pression of continues-tone color or monochrome images.
The AT76C101 performs the Discrete Cosine Transform,
Quantization, and Entropy Encoding during the compres-
sion stage and carries out all inverse operations during the
decompression phase. The AT76C101 uses an external
SRAM as working memory, which is accessed by an on-
chip video interface.
The AT76C101 is designed to operate with minimum host
intervention. A host processor is required to program the
chip in the required operating mode, and to extract the
JPEG header from the compressed bit stream during the
decompression phase. Based on this information, it then
initializes the internal registers. Once the chip has been ini-
tialized, the AT76C101 operates continuously until it has
completed compression/decompression of a image frame.
The image compression ratio is controlled by the user sup-
plied quantization tables, which are loaded before the com-
pression/decompression operation. Compression ratios
from 1:1 to 50:1 are possible depending on the quality and
storage requirements of the application.
Figure 1. AT76C101-based Image Compression System
RAW_OUT
Basic System Configuration
An AT76C101-based image compression system is shown
in Figure 1. The AT76C101 requires the following external
devices:
• A microcontroller to program and initialize the chip in the
required operating mode. This device is also used to
strip the JPEG header during decompression and to
provide the AT76C101 with the header information.
• An external working memory (SRAM) for handling
uncompressed/decompressed images. The size of this
memory depends on the size of the image being
processed. The formula to assess the memory size is
given in the Pixel Interface section of this manual.
• An external memory device to store the compressed
data stream. This external memory can be either a fast
memory or a slow inexpensive memory. The size of this
memory depends on the needs of the specific
application.
YUV
SAMPLING & COLOR
CONVERSION
RGB
IMAGE TO
DISPLAY
24-BIT
RGB
Image
Source
DATA15-0 ADDR15-0
32K x 16
SRAM
RE
WE
AT76C101
SRDATA15-0
SRADDR14-0
M_ADDR19-0
M_DATA7-0
PXWE
PXRE
PXIN
PXOUT
STOP_PIXEL
SRDRIVE
H_SYNC
V_SYNC
PX_CLK
CLK_IN
MEM_CS
TEST
RESET
FRAMEND
FREEZE
MASTER_CS
MASTER_WR
MASTER_OE
BUSY
ADDR19-0
DATA7-0
CS
COMPRESSED
DATA
MEMORY
WR
OE
MICROCONTROLLER
2 AT76C101


Features Datasheet pdf Features • • • • • • • • • • Compatible with the JPEG Basel ine Standard as Defined by ISO IS 109 1 8-1 Highly-integrated, Low-cost Single Chip Solution Up to 40 Mbytes/sec Susta ined Compression Rate Maximum Processin g Rate of 1.6 million pixels/sec Suppor ts 8-bit Grayscale and YUV 4:2:2 Color Space Input and Output Formats Handles Images of Size up to 1024 x 1024 Pixels Fast DCT/IDCT Processor On-chip User-d efined Quantization and Huffman Tables Support for Fast as well as Slow/Inexpe nsive Memories Provides Direct Interfac e for Microcontroller/Microprocessor Ac cess Applications The AT76C101 JPEG Pr ocessor is optimized for use in the fol lowing applications: • Digital Camera s • Color Printers and Plotters • L ow-cost Image Compression Systems • V ideo Editing (3-4 frames/sec at CCIR 72 0 x 480 Image Resolution) JPEG Image C ompression Processor AT76C101 Hardware Resources • • • • • On-chip Video Interface Custom Discrete Cosine Transform and Quantization Processor Variable Length and Huffm.
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