H - Electricity – 04 – J
Patent
H - Electricity
04
J
354/231
H04J 3/06 (2006.01) G06F 5/10 (2006.01) G06F 13/14 (2006.01)
Patent
CA 1322419
ABSTRACT OF THE DISCLOSURE A parallel asynchronous elasticity buffer. Selection of the address of a storage element for writing or reading of data is provided by asynchronous input and output pointers imple- mented using circular gray code counters. The buffer is ini- tialized once during transmission of each frame of data so that the pointers do not select the same storage element for writing and reading at the same time. Write overflow or read underrun of a storage element is detected before any data corruption can occur by comparing the input and output pointers. An error con- dition is detected if the input and output pointers overlap for a threshold period, which can be shorter than the period re- quired for writing or reading of a multibit data unit to or from the buffer. The overlap time period is determined by comparing the pointers at one or more sampling times corresponding to se- lected phases of a clock signal.
597783
Iannarone John R.
Thompson Bruce W.
Digital Equipment Corporation
Smart & Biggar
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