Question: One option for implementing a superscalar system is to use a separate reservation station for each functional execution unit. Each reservation station contains only instructions

One option for implementing a superscalar system is to use a separate reservation station for each functional execution unit. Each reservation station contains only instructions that are executed by its associated functional unit.

An alternative is to use a single large reservation station for all types of instructions. The single composite reservation station can hold as many instructions as all of the separate reservation stations combined. This single composite reservation station is repeatedly scanned to detect instructions that are ready to execute and to dispatch them to the appropriate available execution unit. What is the main disadvantage of using this single composite reservation station? Explain your answer

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