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Functional
Description
The AL422 is a video frame
memory used to buffer audio/video/graphic data for
digital processing, timing correction, or format
conversion. It is manufactured with state-of-the-art
embedded DRAM technology for applications in TVs, VCRs,
scan converters, and digital video systems.
The
AL422 consists of 3Mbits of DRAM, and is configured as
393,216 words x 8 bit FIFO (first in first out). The
high speed and low power consumption are achieved by
using 0.35 micron process technology with embedded EDO
dynamic memory. The interface is very user-friendly
since all complicated DRAM operations are already
managed by the internal DRAM controller.
Current
sources of similar memory (field memory) in the market
provide limited memory size which is only enough for
holding a TV field, but not enough for a whole PC video
frame which normally contains 640x480 or 720x480 bytes.
The AverLogic AL422 provides 50% more memory to support
high resolution for digital PC graphic or video
applications. The 50% increase in speed also expands the
range of applications.
The AL422 can accept
either 3.3V or 5V power with slightly different external
configuration. The internal voltage regulator can
convert 5V power to 3.3V for the embedded DRAM and logic
circuitry when 5V power is applied to VDD pin (#10) only
and leave the DEC pin (#19) decoupled by a capacitor of
2.2uF to ground. The regulator can also be bypassed when
3.3V power is applied to both VDD and DEC pins. In
either case the AL422 is 5V or 3.3V I/O tolerant. The
3.3V configuration consumes less power and is free from
noise interference from the voltage regulator so may be
more ideal for high-speed applications.
Please
note that using the AL422B with 5V configuration can
directly replace the previous AL422V5; using it with
3.3V configuration can directly replace the previous
AL422V3. No additional modification is
required.
For more information about the AL422 or
other AverLogic products, please contact your local
authorized distributor, representative, visit our
website, or contact us directly. |
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Applications
* Multimedia systems
* Video capture
systems
* Video editing systems
* Scan rate
converters
* TV's picture in picture
feature
* Anti-skip CD players
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Features
- 384K (393,216) x 8 bits FIFO
organization
- Supports VGA and CCIR
resolutions
- Independent read/write
operations (different I/O data rates
acceptable)
- High speed asynchronous serial
access
- Read/write cycle time: 20
ns
- Access time: 15 ns
- Output
enable control (data skipping)
- 5V or 3.3V
power supply
- Standard 28-pin SOP
package
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