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AT76C120 View Datasheet(PDF) - Atmel Corporation

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AT76C120 Datasheet PDF : 5 Pages
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Description
The AT76C120 is a highly integrated solution for still-image and video playback applica-
tions. It can also operate as a video capture device for low-cost Personal Video
Recording (PVR) applications. It combines a number of functions that are required in
such devices:
• The design is based on an ARM7® microprocessor that controls the entire chip. A
number of hardware resources, controlled by the ARM processor, perform digital
imaging functions such as image signal processing, JPEG coding/decoding, MPEG-
1 coding/decoding, DMA access to the SDRAM, and video encoding. All of these
computationally-intensive functions are implemented in hardware which can be
programmed according to user specifications, thus allowing the ARM processor to
be free for other user-defined functions. The processor has 8 KB of internal
instruction/data cache that helps it to operate efficiently and use minimal SDRAM
bandwidth.
• The device also features Personal Video Recording capabilities. It has a 16/8-bit
CCIR digital video input interface (shared with the display interface) that can capture
still-image/video data from either a CMOS sensor or a video decoder. The video
data can then be compressed using the MPEG engine.
• The device has numerous display capabilities. It has an integrated video encoder
(double sampling) and 10-bit differential video DACs running at 78 MHz to support
direct display to high-definition TVs and projectors at different VESA rates up to
XGA (1024 x 768) resolutions. The device also has a 24-bit RGB output to interface
to flat-panel TVs (LCDs and Plasma). It supports both square pixel and CCIR-type
formats and can display in NTSC or PAL modes with the same crystal. It also has an
LCD controller that supports a variety of LCD panels (Epson, Casio, AU) without the
need for external ICs. Finally, it has an 8/16-bit CCIR-type output interface.
• The device has a high-performance image scaler that can do up-and-down scaling
at floating point resolutions. This is very useful for playback applications, where
images of arbitrary sizes need to be displayed on fixed resolution displays. In
addition, the device supports hardware rotation, as well as flipping and mirroring in
both vertical and horizontal dimensions. It takes about 120 ms to rotate a 2M image
(1600 pixels) in any direction.
• The AT76C120 has a hardware JPEG compression/decompression engine that can
decode a 2M pixel image in less than 150 ms. Non-standard Huffman JPEG tables
are also supported using a combination of hardware and software resources. The
engine can also do motion JPEG encoding and decoding.
• The integrated MPEG decoder can be used to play video clips taken from digital
cameras and mobile phones. It supports Simple Profile MPEG-4 bitstreams at 30
fps CIF (I and P frames) and MPEG-1 video at 24 fps VGA (I frames only).
• The device utilizes a unified memory architecture using the SDRAM to process,
capture, and play images and video, as well as to store program code and variables.
It supports SDRAM configurations of up to 512 Mbits.
• A static memory controller is included that supports up to four 16 MB Flash or
SRAM devices. Both 8-bit and16-bit data buses are supported, with data accesses
of up to 32 bits. The number of wait states and setup, hold, and data float times are
programmable on a per device (chip select) basis.
• The device supports all Flash cards, including MultiMedia Card (MMC), Secure
Digital (SD), Memory Stick Pro, Smartmedia/SSFDC/NAND Flash, and Compact
Flash, including IDE I/O mode for streaming video. The Flash card interfaces can
support read/write operations at the maximum speeds specified by the Flash cards.
Data transfers between the Flash cards and the SDRAM are handled using high-
2 AT76C120
5676AS–MPIXLY–06/04
 

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