Elastic configurable buffer for buffering asynchronous data
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United States of America Patent
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Nov 28, 1995
Issued Date -
N/A
app pub date -
Jun 23, 1993
filing date -
Dec 22, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An elastic buffer is provided between two busses working with independent clocking. The buffer is implemented by a piece of RAM memory (37) partitioned into sectors (41), each of which contains successive memory addresses. Each sector (41), can be alternatively written and read, so that at a given moment, a sector in write mode and a sector in read mode may coexist. Each sector is controlled by a mark flag (MF), a set flag corresponding to a fully written sector, and a reset flag corresponding to a sector that has been read onto the destination bus. The mark flag of each sector is set, respectively reset, upon the event of a move in pointer, respectively move out pointer, reaching the next adjacent sector. For a given elastic buffer size, the size of the sectors (41) and the number of mark flags are adaptable to the specifications of the data flow between the origin and destination busses.
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