How are cache entries located from memory addresses? Question 2 options: use the tag bits to...
How are cache entries located from memory addresses?
Question 2 options:
|
use the tag bits to find the set, then use the block bits to find a match |
|
|
use the set bits to determine the set index, then use the tag bits to find a match |
|
|
compute an LRU value from the address sought, then search the entries for a match |
|
|
use the set bits to form a tag, then search the entries for a match |
Homework Answers
Option 2 is correct.
use the set bits to determine the set index, then use the tag bits to find a match.
===============================================================
Add Answer to:
How are cache entries located from memory addresses?
Question 2 options:
use the tag bits to...
A primary memory system consists of 128 address bits. Each block within the cache is 256...
A primary memory system consists of 128 address bits. Each block within the cache is 256 bytes. The total cache size is 131,072 bytes. What are the sizes of the tag and index in the cache? First, find the number of blocks. 128,000 bytes # Blocks = 256 bytes per block bort = 512 blocks Where does the 128,000 come from?? Now find the number of bits required to distinguish all the blocks. This is the index aka set size....
2. A computer uses a memory with addresses of 8 bits. (What's the size of the...
2. A computer uses a memory with addresses of 8 bits. (What's the size of the MM?) This computer has a 16-byte cache with 4 bytes per block. (How many blocks in the cache?) The computer accesses a number of memory locations throughout the course of running a program. Suppose this computer uses direct-mapped cache. a. What's the format of a memory address as seen by the cache ? Tag ? bits Block ? bits Offset ? bits b. The...
Question 6 For the following figure shows a hypothetical memory hierarchy going from a virtual address to L2 cache acce...
Question 6 For the following figure shows a hypothetical memory hierarchy going from a virtual address to L2 cache access. The page size is 8KB, the TLB is direct mapped with 128 entries. The L1 cache is a direct mapped 8 KB, and the L2 cache is 2MB and direct mapped. Both use 64 byte blocks. The virtual address is 64 bits and the physical address is 41 bits. For each block in the figure below, fill in the number...
question 2 and 3 2. Determine how many sets of cache blocks will be there for...
question 2 and 3
2. Determine how many sets of cache blocks will be there for the following Cache memory size (in bytes) Direct Mapped Blocks Size (in bits) 32 64 218 2-way Set Associative Block Size (in bits) 32 64 A 2A6 [0.5 * 16 = 8] 4-way Set Associative Block Size (in bits) 32 64 SK 64K 256K 3. The physical memory address generated by a CPU is converted into cache memory addressing scheme using the following mapping...
Question 3: Consider a 32-bit physical address memory system with block size 16 bytes and a...
Question 3: Consider a 32-bit physical address memory system with block size 16 bytes and a 32 blocks direct mapped cache. The cache is initially empty. The following decimal memory addresses are referenced 1020, 1006, 1022, 5106, 994, and 2019 Map the addresses to cache blocks and indicate whether hit or miss. Note: You must use the hexadecimal approach in solving this question. You must also show the computations of dividing the memory address into tag bits, cache index bits,...
Question 17 A direct-mapped cache holds 128KB of useful data (not including tag or control bits)....
Question 17 A direct-mapped cache holds 128KB of useful data (not including tag or control bits). Assuming that the block size is 32-byte and the address is 32-bit, find the number of bits needed for tag, index, and byte select fields of the address. Number of bits for offset bits Number of bits for index bits Number of bits for tag .. bits
) Consider an 8-way associative 64 Kilo Byte cache with 32 byte cache lines. Assume memory...
) Consider an 8-way associative 64 Kilo Byte cache with 32 byte cache lines. Assume memory addresses are 32 bits long. a). Show how a 32-bit address is used to access the cache (show how many bits for Tag, Index and Byte offset). b). Calculate the total number of bits needed for this cache including tag bits, valid bits and data c). Translate the following addresses (in hex) to cache set number, byte number and tag (i) B2FE3053hex (ii) FFFFA04Ehex...
a) Suppose we have a 64 KB, direct-mapped cache with 8-word blocks. Determine how many bits...
a) Suppose we have a 64 KB, direct-mapped cache with 8-word blocks. Determine how many bits are required for the tag, index, and offset fields for a 32-bit memory address. b) If instead, we use a 64 KB, 4-way set-associative cache with 8-word blocks, how many bits will be required for the tag, index, and offset fields for a 32-bit address? c) What type of cache is shown in problem 2? How many bits are required for this cache’s tag,...
In the following table, the left column contains the block addresses of a list of memory...
In the following table, the left column contains the block addresses of a list of memory access request. Use LRU policy when you need to replace blocks in the cache. Fill this table. block address Cache index HtMiss Cache content after access Set 0 Set 1
Question 33 10 pts For a direct mapped cache of 4 blocks with a cache block...
Question 33 10 pts For a direct mapped cache of 4 blocks with a cache block size of 1 byte, in which cache block will each memory location map to? The order of accesses if given by the operation number. Indicate if each access is a hit or a miss, and what the tag value is for each entry. Assume that the cache is initially empty, and the accesses are in order of appearance. REDRAW AND COMPLETE THE CACHE TABLE...
A primary memory system consists of 128 address bits. Each block within the cache is 256 bytes. The total cache size is 131,072 bytes. What are the sizes of the tag and index in the cache? First, find the number of blocks. 128,000 bytes # Blocks = 256 bytes per block bort = 512 blocks Where does the 128,000 come from?? Now find the number of bits required to distinguish all the blocks. This is the index aka set size....
2. A computer uses a memory with addresses of 8 bits. (What's the size of the MM?) This computer has a 16-byte cache with 4 bytes per block. (How many blocks in the cache?) The computer accesses a number of memory locations throughout the course of running a program. Suppose this computer uses direct-mapped cache. a. What's the format of a memory address as seen by the cache ? Tag ? bits Block ? bits Offset ? bits b. The...
Question 6 For the following figure shows a hypothetical memory hierarchy going from a virtual address to L2 cache access. The page size is 8KB, the TLB is direct mapped with 128 entries. The L1 cache is a direct mapped 8 KB, and the L2 cache is 2MB and direct mapped. Both use 64 byte blocks. The virtual address is 64 bits and the physical address is 41 bits. For each block in the figure below, fill in the number...
question 2 and 3
2. Determine how many sets of cache blocks will be there for the following Cache memory size (in bytes) Direct Mapped Blocks Size (in bits) 32 64 218 2-way Set Associative Block Size (in bits) 32 64 A 2A6 [0.5 * 16 = 8] 4-way Set Associative Block Size (in bits) 32 64 SK 64K 256K 3. The physical memory address generated by a CPU is converted into cache memory addressing scheme using the following mapping...
Question 3: Consider a 32-bit physical address memory system with block size 16 bytes and a 32 blocks direct mapped cache. The cache is initially empty. The following decimal memory addresses are referenced 1020, 1006, 1022, 5106, 994, and 2019 Map the addresses to cache blocks and indicate whether hit or miss. Note: You must use the hexadecimal approach in solving this question. You must also show the computations of dividing the memory address into tag bits, cache index bits,...
Question 17 A direct-mapped cache holds 128KB of useful data (not including tag or control bits). Assuming that the block size is 32-byte and the address is 32-bit, find the number of bits needed for tag, index, and byte select fields of the address. Number of bits for offset bits Number of bits for index bits Number of bits for tag .. bits
In the following table, the left column contains the block addresses of a list of memory access request. Use LRU policy when you need to replace blocks in the cache. Fill this table. block address Cache index HtMiss Cache content after access Set 0 Set 1
Question 33 10 pts For a direct mapped cache of 4 blocks with a cache block size of 1 byte, in which cache block will each memory location map to? The order of accesses if given by the operation number. Indicate if each access is a hit or a miss, and what the tag value is for each entry. Assume that the cache is initially empty, and the accesses are in order of appearance. REDRAW AND COMPLETE THE CACHE TABLE...
Most questions answered within 3 hours.
-
A crate slides up a frictionless slope. At the end of 3 seconds
its velocity is...
asked 8 minutes ago -
Use the following information to answer the next seven
questions.
Suppose there are three potential states...
asked 4 minutes ago -
If we only have interstitial and substitutional diffusion, then
what do we consider the process of...
asked 20 minutes ago -
You look at yourself in a shiny 9.6-cm-diameter Christmas tree
ball.
If your face is 21.0...
asked 22 minutes ago -
If we were to measure the relaxation time of a muscle after
undergoing tetanus compared to...
asked 22 minutes ago -
4CO(g) + 8H2(g) -----> 3CH4(g) +
CO2(g) + 2H2O(l)
Use the following data as needed to...
asked 25 minutes ago -
without using map
1. Write a C++ program to find out the top 10 words in...
asked 38 minutes ago -
1)Calculate the percent ionization of a
0.330 M solution of hypochlorous
acid.
% Ionization = %...
asked 41 minutes ago -
1a) How many grams of K2SO4 are in 250mL
of 0.11 M K2SO4 solution?
_____ g...
asked 32 minutes ago -
The vapor pressure of a solution containing 38.7 g glycerin
(C3H8O3) in 146.2 g ethanol (C2H5OH)...
asked 37 minutes ago -
A physics major is cooking breakfast when he notices that the
frictional force between the steel...
asked 42 minutes ago -
A cyclohexane (c-hex) solution is prepared by fully dissolving
9.11g of a newly synthesized organic compound...
asked 48 minutes ago