Memory

Memory - Memory Password_None © Copyright 2009 Daniel Tylavsky ✔ We have already talked about memory devices flip-flops(1 bit and

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Unformatted text preview: Memory Password_____None ________ © Copyright 2009 Daniel Tylavsky ✔ We have already talked about memory devices: flip-flops (1 bit) and registers (multi-bit storage.) ✔ There are many types of memory, let’s look at how they’re classified. Memory – Volatile Memory: When power is lost, data is destroyed. – Non-Volatile Memory: Data is preserved when power is lost. – Random Access: The access time for every bit of memory is the same. Classifiers * Access time is the minimum time a user must wait after applying an address to memory before output data is guaranteed to be valid. – Sequential Access: Must scroll past the first N bits of data to get to the N+1 bit. Memory ✔ Let’s classify some memory: – Floppy Disk / Hard Disk: • Non-Volatile • Most similar to random access. – Magnetic & Cassette Tape: • Non-Volatile • Sequential Access Memory – RAM (Random Access Memory) • Volatile • Random Access – ROM (Read Only Memory) • Non-Volatile • Random Access – Compact Disk ROM (CD ROM): • Non-Volatile • Closest to Random Access Memory St at ic Ra m (S RA M) Dy na mi c RA M (D RA M) Ra nd om Ac ce ss Me mo ry Memory DRAM (Dynamic RAM a.k.a. S ynchronous DRAM): (S)DRAM memory cells store a data bit in a small capacitor rather than in a latch. • Disadvantages: Memory must be refreshed by re- writing the data periodically. ( Refresh time is on the order of 10 milliseconds.) • Advantages: Requires current only on refresh cycle (low power) & High Density. (CMOS)....
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This note was uploaded on 10/21/2010 for the course CSE 120 taught by Professor Matar during the Spring '08 term at ASU.

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Memory - Memory Password_None © Copyright 2009 Daniel Tylavsky ✔ We have already talked about memory devices flip-flops(1 bit and

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