PXA270 datasheet(119/126 Pages) INTEL

119 / 126 page

Electrical, Mechanical, and Thermal Specification

Glossary-9

Intel® PXA270 Processor

Glossary

OFDM: See Orthogonal Frequency Division Multiplexing.

Orthogonal Frequency Division Multiplexing: A special form of multi-carrier modulation. In a multi-path

channel, most conventional modulation techniques are sensitive to inter-symbol interference unless the channel

symbol rate is small compared to the delay spread of the channel. OFDM is significantly less sensitive to

inter-symbol interference, because a special set of signals is used to build the composite transmitted signal. The

basic idea is that each bit occupies a frequency-time window that ensures little or no distortion of the waveform. In

practice, it means that bits are transmitted in parallel over a number of frequency-nonselective channels.

Packet: A bundle of data organized in a group for transmission. Packets typically contain three elements: control

information (for example, source, destination, and length), the data to be transferred, and error detection and

correction bits. Packet data is the basis for packet-switched networks, which eliminate the need to dial-in to send or

receive information, because they are “always on.”

Packet Buffer: The logical buffer used by a USB device for sending or receiving a single packet. This determines

the maximum packet size the device can send or receive.

Packet ID (PID): A field in a USB packet that indicates the type of packet, and by inference, the format of the

packet and the type of error detection applied to the packet.

Packet Switched Network: Networks that transfer packets of data.

PCMCIA: Personal Computer Memory Card Interface Association (PC Card)

PCS: Personal Communications services. An alternative to cellular, PCD works like cellular technology because it

sends calls from transmitter to transmitter as a caller moves. But PCS uses its own network, not a cellular network,

and offers fewer “blind spots” than cellular, where calls are not available. PCS transmitters are generally closer

together than their cellular counterparts.

PDA: Personal Digital Assistant. A mobile handheld device that gives users access to text-based information. Users

can synchronize their PDAs with a PC or network; some models support wireless communication to retrieve and

send e-mail and get information from the Internet.

Phase: A token, data, or handshake packet. A transaction has three phases.

Phase Locked Loop (PLL): A circuit that acts as a phase detector to keep an oscillator in phase with an incoming

frequency.

Physical Device: A device that has a physical implementation; for example, speakers, microphones, and CD

players.

PID: See Packet ID or Process ID.

PIO: Programmed input/output

Pipe: A logical abstraction representing the association between an endpoint on a device and software on the host.

A pipe has several attributes; for example, a pipe may transfer data as streams (stream pipe) or messages (message

pipe). See also stream pipe and message pipe.

PLL: See Phase Locked Loop.

PM: Phase Modulation.

Polling: Asking multiple devices, one at a time, if they have any data to transmit.

POR: See Power On Reset.

PXA270 Datasheet(PDF) 119 Page - Intel Corporation

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