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So, what is memory you ask? Internal storage areas in the computer. The term memory identifies data storage that comes in the form of chips, and the word storage is used for memory that exists on tapes or disks. Moreover, the term memory is usually used as a shorthand for physical memory, which refers to the actual chips capable of holding data. Some computers also use virtual memory, which expands physical memory onto a hard disk.
Every computer comes with a certain amount of physical memory, usually referred to as main memory or RAM. You can think of main memory as an array of boxes, each of which can hold a single byte of information. A computer that has 1 megabyte of memory, therefore, can hold about 1 million bytes (or characters) of information. Listed here are some of the terminology used in conjunction to memory, and it's properties. Click on a letter below to view the list.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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| | | | Page
The number of bits that can be accessed from one row address This is also sometimes referred to as a row
Page Mode
Mode in which if RAS is kept low and the DRAM is given a column address without being given a new row-address, the chip will remember which row it was on the last time and automatically stay on that row It is like saying that all the bits along one row are all on the same page, and the part will assume the same page is intended until a different page is specified
Parity
A bit added to a group of bits to detect the presence of an error The parity bit looks at the other 8 bits and determines if they are even or odd and correspondingly is a 0 or 1 The system compares the 8 bits with the parity bit If they both are even or odd, the data is assumed to be correct If one is even and one is odd, there is an error, and typically the system will fail
Passive Device
A device incapable of current gain or switching, such as a resistor or capacitor
PC100
The PC100 specification defines the requirements for SDRAM modules used on 100MHz FSB motherboards
PC133
The PC133 specification details the requirements for SDRAM modules used on 133MHz FSB motherboards PC133 SDRAM can be used on 100MHz FSB motherboards but will not yield a performance advantage over PC100 memory at 100MHz
PCB
Printed circuit board Board that contains layers of circuitry that is used to connect components to a system
PCMCIA
Personal Computer Memory Card International Association An industry organization that helps to set standards for flash cards
PD
See Presence Detect
Pin(1)
The metal extensions from an IC package or discrete component that connects the component to the PCB
Pin(2)
Another term for the Edge Contacts on a Memory Module
Populated Board
A PCB with components
Power Down
To turn the systems power OFF
Power up
To turn the systems power ON
Presence Detect
Circuitry on certain memory modules that provides information to the system
Processor
The primary chip of the system that oversees all the other components of the system
Pull-up
A device or method used to keep the output voltage of a device at a high level, often a resistor network connected to a positive supply voltage
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