PXA270 datasheet(115/126 Pages) INTEL

115 / 126 page

Electrical, Mechanical, and Thermal Specification

Glossary-5

Intel® PXA270 Processor

Glossary

End User: The user of a host.

Endpoint: See device endpoint.

Endpoint Address: The combination of an endpoint number and an endpoint direction on a USB device. Each

endpoint address supports data transfer in one direction.

Endpoint Direction: The direction of data transfer on the USB. The direction can be either IN or OUT. IN refers to

transfers to the host; OUT refers to transfers from the host.

Endpoint Number: A four-bit value between 0H and FH, inclusive, associated with an endpoint on a USB device.

Envelope detector: An electronic circuit inside a USB device that monitors the USB data lines and detects certain

voltage related signal characteristics.

EOF: End-of-(micro)Frame.

EOP: End-of-Packet.

EOTD: Enhanced Observed Time Difference

ETM: Embedded Trace Macrocell, the ARM* real-time trace capability

External Port: See port.

Eye pattern: A representation of USB signaling that provides minimum and maximum voltage levels as well as

signal jitter.

FAR: Fault Address Register, part of the ARM* architecture.

False EOP: A spurious, usually noise-induced event that is interpreted by a packet receiver as an EOP.

FDD: The Mobile Station transmits on one frequency; the Base Station transmits on another frequency

FDM: Frequency Division Multiplexing. Each Mobile station transmits on a different frequency (within a cell).

FDMA: Frequency Division Multiple Access. An analog standard that lets multiple users access a group of radio

frequency bands and eliminates interference of message traffic.

FHSS: See Frequency Hopping Spread Spectrum.

FIQ: Fast Interrupt Request. See Interrupt Request.

Frame: A 1 millisecond time base established on full-/low-speed buses.

Frame Pattern: A sequence of frames that exhibit a repeating pattern in the number of samples transmitted per

frame. For a 44.1 kHz audio transfer, the frame pattern could be nine frames containing 44 samples followed by one

frame containing 45 samples.

Frequency Hopping Spread Spectrum: A method by which a carrier spreads out packets of information (voice or

data) over different frequencies. For example, a phone call is carried on several different frequencies so that when

one frequency is lost another picks up the call without breaking the connection.

Fs: See sample rate.

FSR: Fault Status Register, part of the ARM* architecture.

PXA270 Datasheet(PDF) 115 Page - Intel Corporation