Our system has the L1 cache that is physically addressed and direct mapped with a 8- byte line and 16 total entries. The current content of the cache appears below: Index 0 1 2 3 4 5 6 7 8 9 Tag 19 15 18 36 32 OD 31 16 24 2D Cache: Direct mapped, 8-byte block, 16 Blocks Valid Blk 0 Blk 1 Blk 2 Blk 3 99 23 1 0 T 0 1 1 0 1 0 - 00 43 36 E1 3A FINIONIN 11 02 6D 72 C2 00 04 8F FO DF 51 14 08 18913312 09 1D 03 Bik 4 EN131618 21 OA 67 8F 89 20 Blk 5 22 OC 78 62 91 21 Blk 6 23 10 PIMINDS 54 34 13 22 Blk 7 24 FIFFIOR 14 E3 23

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter6: System Integration And Performance
Section: Chapter Questions
Problem 6VE
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Question
Our system has the L1 cache that is physically addressed and direct mapped with a 8-
byte line and 16 total entries. The current content of the cache appears below:
Index
0
1
2 1B
3
4
5
6
8
9
A
B
C
D
E
F
Tag
19
15
PAST
36
32
OD
31
16
24
2D
2D
OB
12
16
13
14
Cache: Direct mapped, 8-byte block, 16 Blocks
Valid
Blk 0
Blk 1
Blk 2
Blk 3
99
11
23
14
1
0
T
0
1
1
0
1
1
0
1
0
0
1
1
1
00
43
36
E1
3A
93
04
83
45
02
6D
72
C2
00
15
96
77
23
04
8F
FO
DF
51
DA
34
1B
11
08
09
1D
03
89
3B
15
D3
90
Bik 4
21
UA
67
8F
89
20
EA
F4
54
91
Blk 5
NIB 2815518
22
OC
78
62
91
EB
91
31
8C
Blk 6
23
10
54
34
13
NIULISS
22
EC
03
07
5F
Blk 7
24
14
FF18
11
71
E3
23
ED
18
1E
43
Given a physical address of 0xA7B, provide the following information (make sure you give your
answers in binary for parts a-d; enter the exact bits, no leading zeros and no spaces):
a) What is the block offset (in binary)?
b) What is the set index (in binary)?
c) What is the tag (in binary)?
d) Do we have a cache hit (yes or no)?
e) If your answer in part d) is "yes", what is the value of the data (use the hex value from the
table directly; do not convert to binary)? Enter 0 if your answer in part d) is "no".
Transcribed Image Text:Our system has the L1 cache that is physically addressed and direct mapped with a 8- byte line and 16 total entries. The current content of the cache appears below: Index 0 1 2 1B 3 4 5 6 8 9 A B C D E F Tag 19 15 PAST 36 32 OD 31 16 24 2D 2D OB 12 16 13 14 Cache: Direct mapped, 8-byte block, 16 Blocks Valid Blk 0 Blk 1 Blk 2 Blk 3 99 11 23 14 1 0 T 0 1 1 0 1 1 0 1 0 0 1 1 1 00 43 36 E1 3A 93 04 83 45 02 6D 72 C2 00 15 96 77 23 04 8F FO DF 51 DA 34 1B 11 08 09 1D 03 89 3B 15 D3 90 Bik 4 21 UA 67 8F 89 20 EA F4 54 91 Blk 5 NIB 2815518 22 OC 78 62 91 EB 91 31 8C Blk 6 23 10 54 34 13 NIULISS 22 EC 03 07 5F Blk 7 24 14 FF18 11 71 E3 23 ED 18 1E 43 Given a physical address of 0xA7B, provide the following information (make sure you give your answers in binary for parts a-d; enter the exact bits, no leading zeros and no spaces): a) What is the block offset (in binary)? b) What is the set index (in binary)? c) What is the tag (in binary)? d) Do we have a cache hit (yes or no)? e) If your answer in part d) is "yes", what is the value of the data (use the hex value from the table directly; do not convert to binary)? Enter 0 if your answer in part d) is "no".
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