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Which of the refresh circuit is similar to CBR?(a) software refresh(b) hidden refresh(c) burst refresh(d) distribute refreshI had been asked this question during an interview.The query is from DRAM Refreshing Techniques topic in section Memory Systems of Embedded Systems

Answer»

The correct option is (b) HIDDEN refresh

Best explanation: In the hidden refresh, the refresh cycle is added to the end of a normal READ cycle. The RAS signal goes high and is then asserted low. At the end of the read cycle, the CAS is still asserted. This is similar to the CBR MECHANISM, that is, toggling of the RAS signal at the end of the read cycle starts a CBR refresh cycle.



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