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Thursday, July 19, 2018
Memory Glossary, Memory Terms
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Term Definition
Parity A quality control method that checks the integrity of data stored in a computer's memory. Parity works by adding an extra bit of data to each byte to make the total number of 1's either odd or even An error is detected if the parity circuit determines that this number has changed, indicating that some of the data may have been lost or otherwise corrupted. Two different parity protocols exist, even parity and odd parity. Parity protocols are capable of detecting single bit errors only. To enable multiple-bit error detection, manufacturers must use a more advanced form of error checking called Error Correcting Code (ECC). See also Fake Parity
PC133 PC100 PC66 Around middle of 1998, Intel introduced the BX chip set to their motherboard designs. One element in this new architecture will include an increase in the PC main memory bus speed (Host bus) from 66 to 100 to 133 MHz, called PC 133. To match the 133MHz bus speed, 133MHz SDRAM modules is the required memory technology for this new chip set.
PCB (Printed Circuit Board) A component made up of layers of copper and fiberglass; the surface of a PCB features a pattern of copper lines, or "traces," that provide electrical connections for chips and other components that mount on the surface of the PCB. Examples: motherboard, SIMM, credit card memory, and so on.
PCMCIA (Personal Computer Memory Card International Association) A standard that allows interchangeability of various computing components on the same connector. The PCMCIA standard is designed to support input/ output devices, including memory, fax/modem, SCSI, and networking products.
Pipeline Burst Cache A type of synchronous cache that uses two techniques to minimise processor wait states - a burst mode that pre-fetches memory contents before they are requested, and pipelining so that one memory value can be accessed in the cache at the same time that another memory value is accessed in DRAM.
Primary Cache Cache that is closest to the processor: typically located inside the CPU chip. Can be implemented either as a unified cache or as separate sections for instructions and data. Also referred to as Level 1 cache or internal cache.
Proprietary Memory Memory that is custom-designed for a specific computer
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