3055q5 - Score Section Name ECE 3055 Quiz 5 A direct...

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Unformatted text preview: Score: Section: Name: ECE 3055 Quiz 5 - June 26, 2002 A direct mapping cache with WTWA (i.e. Write Through Write Allocate) is used to reduce the average memory access time on a computer. This cache holds 4096 entries, 16 bit data, and ties into a twenty-bit address bus with no byte or word select bits. Determine the contents of the cache and memory below after the memory requests shown are sent to the cache. Keep track of hits and misses so you can compute the cache miss rate when you are done. All values are in hex. Cache before Cache after Block Tag Data Block Tag Data 1 “’30 FOF’iTCIE‘E 1 40' 0A <5 6 2 50 CABE 2 i 0466‘ 3 Sea/gyms °°°° We) ‘50 OOQO 4 :0 70% 4 20 545,4 5 0001 5 _ ___/ Memory before Memory after Address Data Address Data 20004 BABA 20004 6 /-’ 6/1 50003 M e 0 0 0 50003 0000 40001 1/232: om: 40001 0A r c’ 40004 CABE . 40004 (/1? I“ 6 Memory requests A dress 8 Data Hit{y/n) 2 004 Raid \2 4 01 Write OACE 5 03 Write 0000 5 003 Read Y 4 004 Read N 4 001 Read 2 2 004 Read N Cache miss rate (include reads only) = Lid 0 % ...
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