The CAMERA simulator using fully associative cache has 256 bytes (i.e. 28 bytes) of byte-addressable main memory and a cache of 16 blocks, where each cache block contains 8 bytes.

How many blocks of main memory are there?

What is the format of a memory address as seen by the cache, that is, what are the size of the tag and word fields? An example of format of a memory address is as illustrated below in which we use direct map cache and block size is 4 bits long, word is 3 bits long and tag is 7 bits long.