ATV2500 Application Example: Video Frame Grabber
● This application note shows how the ATV2500 can be used to incorporate multiple control or logic functions into a single programmable logic device. The design example which is used is a simple NTSC video frame grabber. The ATV2500 is used to generate all of the control and addressing for the frame grabber. The application note includes a description of the frame grabber design and implementation using the ATV2500. The ABEL™ source code for the ATV2500 is included for reference and is also available from the PLD applications group on floppy disk.
■ ATV2500 Description
● The ATV2500 is a high density programmable logic device which features 24 I/O pins and 14 input-only pins. Each I/O pin is associated with a logic macrocell (see Figures 1 and 2). The output can be configured as either combinatorial or registered. Each macrocell contains two flip-flops, 12 product terms which can be split into three separate sum terms, and an output enable. Each flip-flop has a clock term and an asynchronous reset term. Groups of four or eight flip-flops each have a common synchronous pre-set product term.
● Each macrocell has a feedback path from the pin and from each register. This makes it possible to bury both registers and use the pin for either a combinatorial output or an input pin. A global bus routes all pins and register feedbacks to every logic cell.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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1999 |
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Rev. 0251D |
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0251D–08/99 |
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206 KB |
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