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DRAM Presentation

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DRAM Presentation

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    1. DRAM Presentation By Gregory Wilson

    2. Getting Started History of DRAM What is DRAM Different types of DRAM Conclusion Sources

    3. History of DRAM Invented in 1966 by Robert Dennard at IBM. Was the first form of volatile memory for computers. Helped to set the pace for all present-day computers using volatile memory.

    4. What is DRAM A form of volatile, temporary, memory, like RAM. DRAM uses one transistor, while RAM uses six. Because of capacitor data leakage, DRAM needs to periodically refresh the data it stores.

    5. Different Types of DRAM There are several different types of DRAM: Asynchronous DRAM Synchronous DRAM Video DRAM Burst EDO DRAM

    6. Asynchronous DRAM Most basic form of DRAM. Has power connections, a few address inputs, and bidirectional data lines. Commands from 4 active low control signals.

    7. Asynchronous DRAM: Control Signals /RAS (Row Address Strobe): address inputs captured at the falling edge of this strobe. /CAS (Column Address Strobe): address inputs captured at the falling edge of this strobe and selects a row from an open row to read/write. /WE (Write Enable): determines if a falling edge of /CAS is a read (high) or a write (low). /OE (Output Enable): controls output to data I/O pins.

    8. Video DRAM (VDRAM) Dual-port version of DRAM First port accessed as regular DRAM. Second sends streams of data to be displayed on monitor. Almost made obsolete with the intro of SDRAM (Synchronous Dynamic Random Access Memory).

    9. Synchronous DRAM (SDRAM) Uses a clock signal before responding to control input. It is able to synchronize with computer’s processor. Clock used to drive internal finite state machine for instructions. Its chip design has more complex patterns that DRAM’s

    10. Synchronous Graphics Random Access Memory (SGRAM) Popular in the 1990’s and 2000’s. Specialized form of SDRAM for graphic adaptors. Uses a single port. Can use bit masking and block writing functions. Opens 2 memory pages @ one time.

    11. Work Cited “Dynamic Random Access Memory”. Wikipedia, The Free Encyclopedia. 26 April 2007. <http://en.wikipedia.org/wiki/Dynamic_random_access_memory> Lemelson-MIT Program. “Random Access Memory”. Inventor of the Week: Archive. March 2000. 26 April 2007. http://web.mit.edu/invent/iow/Dennard.html “SDRAM”. Wikipedia, The Free Encyclopedia. 27 April 2007. < http://en.wikipedia.org/wiki/SDR_SDRAM>

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