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MEMORY ARRAYS (Cache Memories (Manifestations (Temporal locality (Recently…
MEMORY ARRAYS
Random Access Memory
RAM
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DYNAMIC
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Read operation
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Capacitor charge > threshold, drives bit line to full voltage
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ROM
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Types
PROM
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Programmability - use fuse, blowing it
creates logic 0, keeping it creates logic 1
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EEPROM
Can be programmed, erased and reprogrammed electrically
Disadvantage: different voltages are required for erasing,
writing, and reading the stored data
FLASH
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Higher density, higher capacity with lower cost
per bit
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Operation
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Logic 0 when connected to ground, otherwise
logic 1
Memory Hierarchy
Dynamic memories
Slow, small basic cells, high
power consumption
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Static memories
Fast, large basic cells, low
power consumption
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