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Quiz #2: KT14203-Computer Architecture and Organization

This document contains a quiz question about cache memory organization. 1) The cache has 512 lines of 16 bytes each, with a total size of 8 KB. The main memory is 64 MB. This requires a 26-bit address with a 14-bit tag, 8-bit set, and 4-bit word field. 2) For the memory address 2FE8907 in hexadecimal, the tag is 2FE8, set is 90, and word is 7 in binary formats.

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120 views1 page

Quiz #2: KT14203-Computer Architecture and Organization

This document contains a quiz question about cache memory organization. 1) The cache has 512 lines of 16 bytes each, with a total size of 8 KB. The main memory is 64 MB. This requires a 26-bit address with a 14-bit tag, 8-bit set, and 4-bit word field. 2) For the memory address 2FE8907 in hexadecimal, the tag is 2FE8, set is 90, and word is 7 in binary formats.

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b2uty77_593619754
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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KT14203- Computer Architecture and Organization

Sekolah Kejuruteraan dan Teknologi Maklumat

Keakitekturan Komputer
Semester 2 2013/2014

Quiz #2

Marked question (11 marks)

1. A two-way set-associative cache has a number of lines of 16 bytes each


and a total size of 8 Kbytes. The 64-Mbyte main memory is byte
addressable.
a. Show the format of main memory addresses.

Answer:

There are a total of 8 kbytes/16 bytes = 512 lines [1] in the cache.
Thus the cache consists of 256 sets [1] of 2 lines each.
Therefore 8 bits [1] are needed to identify the set number.
For the 64-Mbyte main memory, a 26-bit address is needed. Main memory
consists of 64-Mbyte/16 bytes = 222 blocks [1].
Therefore, the set plus tag lengths must be 22 bits, so the tag length is 14
bits [1] and the word field length is 4 bits (16 bytes = 24) [2].

TAG SET WORD


Main memory address = 14 8 4

b. For a hexadecimal memory address of 2FE8907, show the Tag, Set


and Word values using the address format identified in (a).
Answer:

Binary of 2FE8907 = 10 1111 1110 1000 1001 0000 0111 [1]


Tag = 10111111101000 = 2FE8 [1]
Set = 10010000 = 90 [1]
Word = 0111 = 7 [1]

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