In an associative memory system, what is the purpose of the Argument Register?
2025
In an associative memory system, what is the purpose of the Argument Register?
- A.
To hold the data that is read from memory
- B.
To store the memory address for access
- C.
To count the number of matches in memory
- D.
To store the key used for matching in associative search
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Show answer & explanation
Correct answer: D
The Argument Register is a special register used in computer architecture, especially in systems like associative memory (Content Addressable Memory - CAM), to store the value that is to be searched or compared across memory.
🔹 What is its main purpose?
The Argument Register holds the search key—the data value that the system wants to locate in memory.
🔹 How does it work?
A data value (for example, an ID or binary pattern) is placed into the Argument Register.
The associative memory hardware compares this value with all stored memory entries simultaneously.
Any matching entries are identified and returned instantly.
🔹 Why is it useful?
Enables extremely fast searching (parallel comparison across memory)
Commonly used in cache systems, database indexing, and network routing tables
Eliminates the need for slow sequential searching
🔹 Key idea
The Argument Register does not perform computation itself. It simply provides the input value for comparison, while the memory hardware performs the actual matching process.