Asked by: Limei Berton
asked in category: General Last Updated: 21st June, 2020

What is tag directory in cache?

Tag directory is used to search data in distributed last level caches. If the requested data is not found in any caches, a memory address is sent from the tag directory to the memory controller.

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Consequently, what is a cache tag?

tag - A unique identifier for a group of data. Because different regions of memory may be mapped into a block, the tag is used to differentiate between them. valid bit - A bit of information that indicates whether the data in a block is valid (1) or not (0). 2 Locating data in the cache.

Also, how does a cache work? Cache memory is used to reduce the average time to access data from the Main memory. The cache is a smaller and faster memory which stores copies of the data from frequently used main memory locations. There are various different independent caches in a CPU, which store instructions and data.

Also question is, what is TAG field in cache memory?

A tag is said to be a matching tag if, after decoding a CPU address from a pending read or write, the tag field of the CPU address matches the tag associated with a cache block at the cache address given by (index, offset).

How many bits is a word?

16 bits

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