ECE243 Practice Question Website

Given the following cache and cache configuration:

TAG	SET	OFFSET
6	2	2

2-way set associative
4 byte cache line
32 byte cache
10 bit address
Assume a write-back cache
Assume that the cache will replace data in block 0 before lines in block 1 when replacement is required for this question.

	Block#	Tag (binary)	Data (3..0)	Valid	Dirty
Set Index = 0	0	010110	A5 06 72 B4	0	0
	1	010010	A5 06 72 B4	0	0
Set Index = 1	0	010110	3A 59 BC 94	0	1
	1	010111	3A 59 BC 94	1	1
Set Index = 2	0	111111	FF FF FF FF	1	0
	1	110011	19 FD E4 FF	1	0
Set Index = 3	0	100100	A4 4A 56 65	1	1
	1	000011	A4 4A 56 65	0	1

For each of the following memory operations fill in the blocks given with the result of the operation on the cache. Use MM to indicate unknown data fetched from memory.
The entry below is completed for you as an example of what to do.

Operation: CPU reads from $360
Hit(H) or Miss(M):  M	Fetch from memory?    No X Yes, from $360 to $363

--Result--	Block#	Tag (binary)	Data (3..0)	Valid	Dirty
Set Index = 0	0	110110	MM MM MM MM	1	0

Operation: CPU writes $FF to $24E
Hit(H) or Miss(M):	Fetch from memory?    No    Yes, from      to

--Result--	Block#	Tag (binary)	Data (3..0)	Valid	Dirty
Set Index =