How many bits of SRAM are needed to build this cache?

How many bits of SRAM will be needed for this cache? Each block has 64 bytes = 512 bits of SRAM, plus one valid bit, plus 18 bits for the tag = 531 bits. There are 256 sets of 4 blocks each, giving 543744 total bits, or about 66.4KB. So about 4\% of the bits in the cache are for overhead.

How many cache blocks does the 2 way set associative cache have?

Example 3.8 Direct-Mapped Versus Set-Associative Caches We compare a direct-mapped cache with four blocks and a two-way set-associative cache with four sets, and we use LRU replacement to make it easy to compare the two caches.

How many SET index bits do fully associative caches need?

Note that in a fully-associative cache, there is only 1 set so the set index will not exist. The remaining bits are used for the tag.

How many bits to implement cache?

Because the main memory is 16kB, we need a minimum of 14 bits to uniquely represent a memory address. Since each cache block is of size 4 bytes, the total number of sets in the cache is 256/4, which equals 64 sets. The incoming address to the cache is divided into bits for Offset, Index and Tag.

How many bits does 8kb represent in computer?

KB to Bits Conversion Table

Kilobytes (KB)	Bits (b)
1 KB	8000 bits
2 KB	16000 bits
3 KB	24000 bits
4 KB	32000 bits

What is cache size?

The “size” of the cache is the amount of main memory data it can hold. This size can be calculated as the number of bytes stored in each data block times the number of blocks stored in the cache.

How many blocks are in a cache?

Each set contains 2 cache blocks (2-way associative) so a set contains 32 bytes….

18	10	4
TAG	SET	OFFSET

How many set index bits does cache memory have if it has total 256 sets?

cache. Thus the cache consists of 256 sets of 2 lines each. Therefore 8 bits are needed to identify the set number.

How many cache line a fully associative cache has?

A memory address can map to a block in any of these ways. A fully associative cache is another name for a B-way set associative cache with one set. Figure 8.11 shows the SRAM array of a fully associative cache with eight blocks.

How many SRAM cells are in a cache?

Caches are made from matrices of SRAM cells. Let’s consider, for simplicity, a direct mapped tagless cache of 16 kilobits It is arranged as a 128 x 128 matrix of SRAM cells. An index into the cache is 14 bits wide. This index is divided into 7 row address lines and 7 column address lines.

How many bits are in a 4 MB megabyte file?

MB to Bits Conversion Table

Megabytes (MB)	Bits (b)
3.8 MB	30400000 bits
3.9 MB	31200000 bits
4 MB	32000000 bits
4.1 MB	32800000 bits