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Glossary

There are 17 entries in this glossary.
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Glossaries

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Term Definition
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
Pin
1. The metal extensions from an IC package or discrete component that connects the component to the PCB. 2. Another term for the Edge Contacts on a Memory Module
PIO
Programmed input/output is a method of transferring data between the CPU and a peripheral such as a network adapter or an ATA storage device.
Populated Board
A PCB with components
Power Down
To turn the system's power OFF.
Power up
To turn the system's power ON.
Presence Detect
Circuitry on certain memory modules that provides information to the system.