Question
Assuming the cache is filled with the following data: cache way 1 cache way 2 Line Number Valid Bit Tag Data Valid Bit Tag Data
Assuming the cache is filled with the following data:
cache way 1 | cache way 2 | |||||
Line Number | Valid Bit | Tag | Data | Valid Bit | Tag | Data |
... | ||||||
00...00011 | 1 | 00...01 | ... | 1 | 10...00 | ... |
... | ||||||
00...01000 | 1 | 10...01 | ... | 0 | 00...10 | ... |
00...01001 | 0 | 10...00 | ... | 1 | 00...00 | ... |
... |
In this table, ... represents a sequence of zero(s)
Given the following memory references, identify each of them as a cache hit (write H in the blank) or a cache miss (write M in the blank). Also explain.
Hints: The valid bit indicates a cache entry that is not actually valid anymore for some reason (maybe cache invalidated because of write in other core/cache for example). So if a reference resolves to a line that is not valid, it is still a miss. Make sure you correctly identify the line and tag when determining a hit or miss here.
Tag | Line | Word Offset |
00...00 | 00...01001 | 1100100 |
|
Tag | Line | Word Offset |
10...00 | 00...01001 | 0110110 |
|
Tag | Line | Word Offset |
10...01 | 00...00011 | 1110011 |
|
Tag | Line | Word Offset |
10...00 | 00...00011 | 0110110 |
|
Tag | Line | Word Offset |
10...01 | 00...01000 | 0100010 |
|
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