Electrical pulse counters – pulse dividers – or shift registers: c – Counting or dividing in incremental steps – Beam type tube
Patent
1993-11-19
1996-10-15
Robertson, David L.
Electrical pulse counters, pulse dividers, or shift registers: c
Counting or dividing in incremental steps
Beam type tube
377 51, 364DIG1, 3649427, G06F 1314, G06M 312
Patent
active
055663222
ABSTRACT:
Method and apparatus for performing read accesses from a counter (40) while avoiding the large rollover error that may occur when the counter (40) is read using more than one read access cycle. In one embodiment, the present invention monitors the most significant bit of the lower portion (44) of counter (40) for a transition indicating that a rollover has taken place. If a rollover has not occurred, read accesses take place in the normal manner. However, if a rollover has occurred during the latency period between a read access from the upper portion (42) of counter (40) and a corresponding read access from the lower portion (44) of counter (40), the read access from the lower portion (44) is inhibited and a default value is placed on the bus (36) instead.
REFERENCES:
patent: 4679194 (1987-07-01), Peters et al.
Jelemensky Joseph
Pechonis Daniel W.
Waite John B.
Yishay Oded
Ellis Kevin L.
Hill Susan C.
Motorola Inc.
Robertson David L.
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