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lecture17 - Lecture 17 Memories(SRAM EECS 312 Reading...

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EECS 312 1 Lecture 17: Memories (SRAM) EECS 312 Reading: 12.1.2 (exclude pgs 632- 633), 12.2.3
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Last Time EECS 312 2 • Read-only memories (ROMs) – Permanent -- take away power and stored state remains – Structural changes reflect stored data (transistor connected or not) • Non-volatile read-write memories – Rely on specialized device architectures to allow for re-writing – Typically slow re-write mechanism
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Lecture Overview EECS 312 3 • Read-write memories (volatile) – Random access memory (RAM) – Static (think static logic)
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Generic Memory Structure EECS 312 4
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Memory Architecture: Decoders EECS 312 5 Word 0 Word 1 Word 2 Word N-1 Word N-2 Input-Output S 0 S 1 S 2 S N-2 S N_1 (M bits) Storage Cell M bits N W or ds Word 0 Word 1 Word 2 Word N-1 Word N-2 Input-Output (M bits) Storage Cell M bits De co de r A 0 A 1 A K-1 S 0 N words => N select signals Too many select signals Decoder reduces # of select signals K = log 2 N
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Array-Structured Memory Architecture EECS 312 6 Problem: ASPECT RATIO or HEIGHT >> WIDTH
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lecture17 - Lecture 17 Memories(SRAM EECS 312 Reading...

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