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Design your own memory using ABEL

Posted: 05 May 2006     Print Version  Bookmark and Share

Keywords:ABEL  Advanced Boolean Expression Language 

Design your own memory using ABEL

Designing memory devices would seem to be beyond the abilities of most embedded systems developers. These devices are packed with an enormous amount of interconnected logic that makes them almost impossible to design 100% schematically. Designing memory chips involves iterating millions of storage cells and implementing sophisticated address decoding for accessing each row of cells. Moreover, multiplexing data out of those storage cells to the external data bus also requires awesome logic.

In this article, I'll demonstrate how to design an 8MB static random access memory (SRAM) using a combination of schematic design and a bit of ABEL (Advanced Boolean Expression Language) programming to overcome the aforementioned hardships. ABEL provides a means of making behavioural descriptions of a logic circuit. For purposes of demonstration I'll be using an ispLEVER starter module from Lattice Semiconductor.

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