Refresh miss detect circuit for self-refreshing DRAM
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United States of America Patent
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Jun 29, 2004
Grant Date -
N/A
app pub date -
Oct 11, 2002
filing date -
Oct 11, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A counter is incremented whenever an internal refresh is requested and a prior internal refresh request has not yet been completed. A refresh-request storage element such as a latch circuit, provides an output signal that is set upon receipt of an internal refresh request control signal to initiate an internal refresh cycle. A refresh-request storage element is reset upon initiation of an internal refresh cycle. A refresh miss detector provides an output pulse when the refresh request signal is received concurrent with the refresh request storage element being set. Provision is made to read out the count, and to reset the count. By reading out the count an indication is obtained of how many refresh requests were missed, and by using arbitrary input patterns the robustness of the self-refreshing DRAM is improved.
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