Assertion A: Major advantage of DRAM is that the capacitor cell never loses its charge and hence there is no need to refresh periodically. Reason R: When DRAM is being refreshed, the data cannot be accessed.
89) Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Major advantage of DRAM is that the capacitor cell never loses its charge and hence there is no need to refresh periodically.
Reason R: When DRAM is being refreshed, the data cannot be accessed.
In light of the above statements, choose the correct answer from the options given below
1. Both A and R are true and R is the correct explanation of A [Option ID = 3185]
2. Both A and R are true but R is NOT the correct explanation of A [Option ID = 3186]
3. A is true but R is false [Option ID = 3187]
4. A is false but R is true [Option ID = 3188]
Answer: 4
Detailed Explanation:
DRAM (Dynamic RAM) stores data in capacitors. Capacitors naturally leak charge over time. To prevent data loss, the memory controller must perform a Refresh Cycle typically every 64ms or less. This is actually a major disadvantage compared to SRAM.
During a refresh operation, the specific memory bank or row is locked. Because the refresh process requires reading and rewriting the data to the capacitor, the data bus and internal logic are busy, making the memory temporarily unavailable for CPU access.