Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Questions > In a DRAM,a)periodic refreshing is not requir...
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In a DRAM,
- a)periodic refreshing is not required
- b)information is stored in a capacitor
- c)information is stored in a latch
- d)both read and write operations can be performed simultaneously
Correct answer is option 'B'. Can you explain this answer?
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In a DRAM,a)periodic refreshing is not requiredb)information is stored...
In a DRAM chip, each bit of memory data is stored as the presence or absence of an electric charge on a small capacitor on the chip. As time passes, the charges in the memory cells leak away, so without being refreshed the stored data would eventually be lost.
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In a DRAM,a)periodic refreshing is not requiredb)information is stored...
Answer:
In a DRAM (Dynamic Random Access Memory), information is stored in a capacitor. This is different from a latch, which is used in SRAM (Static Random Access Memory). Let's discuss each option and understand why option 'B' is the correct answer.
Option A: Periodic refreshing is not required
In DRAM, periodic refreshing is indeed required. This is because the information stored in the capacitors tends to leak over time due to their inherent property of charge leakage. To prevent the loss of data, the charge on the capacitors needs to be refreshed periodically.
Option B: Information is stored in a capacitor
This is the correct answer. In DRAM, each bit of data is stored in a capacitor within a memory cell. The capacitor holds an electrical charge representing the data. To read the data, the charge on the capacitor is measured, and to write data, the charge on the capacitor is modified.
Option C: Information is stored in a latch
This statement is incorrect. Latches are used in SRAM, not DRAM. In SRAM, data is stored in a flip-flop latch circuit that holds its state as long as power is supplied. Unlike DRAM, SRAM does not require periodic refreshing.
Option D: Both read and write operations can be performed simultaneously
This statement is incorrect for DRAM. DRAM is a asynchronous memory, which means that read and write operations cannot be performed simultaneously. When a read operation is being performed, the charge on the capacitor needs to be amplified and restored, which takes some time. Therefore, DRAM requires a separate read cycle and write cycle, and they cannot be performed simultaneously.
In summary, the correct answer is option 'B' because in a DRAM, information is indeed stored in a capacitor.
In a DRAM (Dynamic Random Access Memory), information is stored in a capacitor. This is different from a latch, which is used in SRAM (Static Random Access Memory). Let's discuss each option and understand why option 'B' is the correct answer.
Option A: Periodic refreshing is not required
In DRAM, periodic refreshing is indeed required. This is because the information stored in the capacitors tends to leak over time due to their inherent property of charge leakage. To prevent the loss of data, the charge on the capacitors needs to be refreshed periodically.
Option B: Information is stored in a capacitor
This is the correct answer. In DRAM, each bit of data is stored in a capacitor within a memory cell. The capacitor holds an electrical charge representing the data. To read the data, the charge on the capacitor is measured, and to write data, the charge on the capacitor is modified.
Option C: Information is stored in a latch
This statement is incorrect. Latches are used in SRAM, not DRAM. In SRAM, data is stored in a flip-flop latch circuit that holds its state as long as power is supplied. Unlike DRAM, SRAM does not require periodic refreshing.
Option D: Both read and write operations can be performed simultaneously
This statement is incorrect for DRAM. DRAM is a asynchronous memory, which means that read and write operations cannot be performed simultaneously. When a read operation is being performed, the charge on the capacitor needs to be amplified and restored, which takes some time. Therefore, DRAM requires a separate read cycle and write cycle, and they cannot be performed simultaneously.
In summary, the correct answer is option 'B' because in a DRAM, information is indeed stored in a capacitor.
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In a DRAM,a)periodic refreshing is not requiredb)information is stored in a capacitorc)information is stored in a latchd)both read and write operations can be performed simultaneouslyCorrect answer is option 'B'. Can you explain this answer?
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