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MEMORY
VIDEO SUMMARY 5
11/6/2013
Michael EbongProfessor Marshall Stevens |

Memory
ROM stands for read only memory, while RAM stands for random access memory.
SRAM vs DRAM.
SRAM also known as Static Ram is faster, more expensive and does not need to be refreshed. SRAM is used by the CPU to store its Cache memory. When Ram is upgraded, what we getting is DRAM. They come in three types; SIMM, DIMM and RIMM.
SIMM is kind of outdated and they did used a 32bit data path and a 30pin and 72 pin versions.
DIMM has a 64bit data path, they were synchronized to system clock. They are referred to as SDRAM-Synchronized Dynamic Ram. Modern innovations of SDRAM include DDR and DDR2. Regular SDRAM had 168 pins and two notches for alignment when installing. DDR SDRAM has 184 pins and one notch for alignment. They are two times faster than SDRAM and has 240 pins, and one notch for alignment and four times faster than SDRAM.
Dual Cleaning Channeling;
DDR, DDR2 and SDRAM uses a technology called dual channeling. Two slots processing information together.
RIMM, RAMBUS/RDRAM
They look similar to DIMM, with two notches in the center of the module and are a lot faster and more expensive. They were thought to have replaced SDRAM, but because of marketing agreement, they never caught on. Then DDR was developed and it end up dominating the market.
Memory Error;
Parity checking is a way of looking for memory errors. Parity bit checks the integrity of each byte, determine if the byte is good or bad. The only problem was it turns out that it could not check which bit was bad and couldn’t correct the problem.
ECC-modem memory uses ECC which can check bits for errors and can repair the bits.