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How do CBR works?

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How do CBR works?

(a) by asserting CAS before RAS

(b) by asserting CAS after RAS

(c) by asserting RAS before CAS

(d) by asserting CAS only

This question was addressed to me in an online quiz.

Query is from DRAM Refreshing Techniques in division Memory Systems of Embedded Systems

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The correct choice is (a) by asserting CAS before RAS

The explanation: CBR works by an internal address counter which is periodically incremented. The mechanism is based on CAS before RAS. Each time when RAS is asserted, the refresh cycle performs and the counter is incremented.

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