Sat, 7 Mar 2015, 20:36


A student writes:

> Hi Dr. Patt,
> What exactly is a tag store size? Why is one dimension 21, when
> valid+dirty+tag=10 bits? Thank You.
>
> <>

Tag store size = the number of bits stored in the tag store.  The solution
shows the answer as 21 times 32.  We have 32 sets since there are five 
index bits.  Each set consists of 21 bits: two tag store entries (10 bits
each) + one bit for LRU.

Good luck on the exam.

Yale Patt