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Associative Memory
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K.R.Raguram
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C A &
P P
ASSOCIATIVE MEMORY
1
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C A
ASSOCIATIVE MEMORY
&
P P
A memory unit accessed accessed by content content is called called an associative associative
memory or Content Addressable Addressable Memory(CAM)
It is also called as parallel search memory or multi-access memory
Search procedure and algorithm
Stored data can be identified for access by content of data
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CONT…
Memory is accessed simultaneously and in parallel on basis of data rather than address or location.
More expensive than RAM – RAM – Each cell must have storage capability & logic circuits for matching content with external argument
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C A &
P P
BLOCK DIAGRAM OF ASSOCIATIVE MEMORY
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C A
H ARDW ARDWARE ARE ORGANISATION
&
P P
Memory array – array – m words with n bits per word
Each word in memory is compared in parallel with content of argument register.
Key register – – Provides mask for choosing a particular field or key in argument word.
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C A &
ASSOCIATIVE MEMORY
P P LHS
RHS
A Register 101 111100 K Register 111 000000
Argument Key (Mask)
Memory Word 1 Word 2
100 111100 111100 M = 0 101 000011 M = 1
M = 1, Match
Match Logic
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C A &
P P
m word x n cells per word
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C A &
P P
ONE CELL OF ASSOCIATIVE MEMORY
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C A &
P P
CONT…
Internal organisation organisation of cell Cij.
The input bit is transferred into storage cell during a
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C A
Match Logic
&
P P
Match logic for each word is derived from comparison algorithm for two binary numbers.
First neglect key bits
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C A
OPERATION OF ASSOCIATIVE MEMORY
&
P P
Key bit K j : x j + K j’
K j = 0 : A j and Fij need no comparison ( K j : x j + 1 = 1 )
K j = 1 : A j and Fij need comparison ( K j : x j + 0 = x j )
Match Logic for word I :
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C A
M A ATCH TCH LOGIC FOR ONE WORD
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C A
READ OPERATION
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C A
CONT
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C A
WRITE OPERATION
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C A
CONT
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