Intel PXA27 Series Design Manual page 282

Glossary
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.
FIFO. First In/First Out is a buffering scheme in which the first byte of data that enters the buffer is also the first
byte of data retrieved by the serial port (controlled by UART chip)
FIQ. Fast Interrupt Request. See Interrupt Request.
FIR. Fast Infrared
FICP. Fast Infrared Communications Port is a low-voltage controller that can be connected directly to the device's
.
transmit, receive, and shutdown logic signals of the transceiver The controller operates at half-duplex and is based
on 4-Mbps and four-position pulse modulation, providing a very fast data rate.
Flash Memory. Flash is a type of erasable, rewritable memory that holds its content when power is off. The low-
cost, low-power and high-density memory chip, with high-speed architecture, is highly reliable.
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.
FS-CSP. Folded Stacked-Chip Scale Package. Method for escape routing for copper-defined land pads that
involves routing signals on the four inner rows of balls in the chip scale package from the top layer to the inner PCB
layers for routing way from the package.
FSR. Fault Status Register. Part of the ARM* architecture.
Full-duplex. Computer data transmission occurring in both directions simultaneously.
Full-speed. USB operation at 12 Mbps. See also Low-speed and High-speed.
Function. A USB device that provides a capability to the host, such as an ISDN connection, a digital microphone,
or speakers.
GMSK. Gaussian Minimum Shift Keying. A modulation scheme used in GSM.
GPRS. General Packet Radio Service. A technology that sends packets of data across a wireless network at speeds
up to 114 Kbps. Unlike circuit-switched networks, wireless users do not have to dial in to networks to download
information; GPRS wireless devices are "always on" in that they can send and receive data without dial-ins. GPRS
works with GSM.
GPS. Global Positioning System allows location of an object anywhere on earth using a constellation of satellites
orbiting the earth.
GPIO. General Purpose Inputs/Outputs
®
Glossary-6 Intel PXA27x Processor Family Design Guide