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Tuesday, April 15, 2014
Memory Glossary, Memory Terms
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Term Definition
Fake Parity Unlike odd and even parity, fake parity is not capable of detecting an invalid data bit. It was designed to artificially 'satisfy' a parity-enabled computer without actually checking the data for errors. Fake parity attaches a bit to each byte of data just like odd and even parity protocols. The difference is that fake parity simply adds the correct parity bit as the data is sent to the CPU instead of attaching it before the data is stored to memory, and recalculating it before the byte passes to the CPU.
Flash Memory Flash memory is a non-volatile memory device that retains its data when the power is removed. The device is similar to EPROM with the exception that it can be electrically erased, whereas an EPROM must be exposed to ultra-violet light to erase.Flash memory does not need a constant power supply to retain its data and it offers extremely fast access times, low power consumption, and relative immunity to severe shock or vibration. These qualities combined with its compact size, make it perfect for portable devices like scanners digital cameras, cell phones, pagers, handhelds and printers. Flash chips have a lifespan limited to 100,000 write cycles, which means flash will never replace main memory in
computers.
FPM (Fast-Page Mode) A common DRAM data-access scheme. Accessing DRAM is similar to finding information in a book. First, you turn to a particular page, then you select information from the page. Fast-page mode enables the CPU to access new data in half the normal access time, as long as it is on the same page as the previous request.
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