Ping-Pong scheme uses semaphores to pass dual-port-memory privileges.

EDN | June 6, 1996| | Copyright

Numerous schemes for passing data between processors and dual-port memory are possible. However, a Ping-Pong scheme uses just three semaphores, uses no state information inside the dual-port memory, and does not depend on time.

During the last few years, the price of dual-port memory has dropped to a level that makes it feasible for use in embedded systems. Using a dual-port RAM seems attractive, but you must know how to use this RAM properly. The two processors, one on each side of the dual-port RAM, cannot just read and write to the dual-port RAM at any time. To help ...

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