Intel PXA270 Optimization Manual page 136

SSE2 Streaming SIMD Extensions 2: for Intel Architecture machines, 144 new instructions, a 128-bit SIMD
integer arithmetic and 128-bit SIMD double precision floating point instructions, enabling enhanced multimedia
experiences.
SSP Synchronous Serial Port
SSTL Stub series terminated logic
Stage One part of the sequence composing a control transfer; stages include the Setup stage, the Data stage, and the
Status stage.
Start-of-Frame (SOF) The first transaction in each (micro)frame. An SOF allows endpoints to identify the start of
the (micro)frame and synchronize internal endpoint clocks to the host.
Stream Pipe A pipe that transfers data as a stream of samples with no defined USB structure
SWI Software interrupt.
Synchronization Type A classification that characterizes an isochronous endpoint's capability to connect to other
isochronous endpoints.
Synchronous RA The incoming data rate, Fsi, and the outgoing data rate, Fso, of the RA process are derived from
the same master clock. There is a fixed relation between Fsi and Fso.
Synchronous SRC The incoming sample rate, Fsi, and outgoing sample rate, Fso, of the SRC process are derived
from the same master clock. There is a fixed relation between Fsi and Fso.
System Programming Interface (SPI) A defined interface to services provided by system software.
TC Temperature Cycling
TDD Time Division Duplexing The Mobile Station and the Base Station transmit on same frequency at different
times.
TDM See Time Division Multiplexing.
TDMA Time Division Multiple Access. TDMA protocol allows multiple users to access a single radio frequency
by allocating time slots for use to multiple voice or data calls. TDMA breaks down data transmissions, such as a
phone conversation, into fragments and transmits each fragment in a short burst, assigning each fragment a time
slot. With a cell phone, the caller would not detect this fragmentation. TDMA works with GSM and digital cellular
services.
TDR See Time Domain Reflectometer.
Termination Passive components attached at the end of cables to prevent signals from being reflected or echoed.
TFT Thin Film Twist, a type of active LCD panel.
Three-state a high-impedance state in which the output is floating and is electrically isolated from the buffer's
circuitry.
Time Division Multiplexing (TDM) A method of transmitting multiple signals (data, voice, and/or video)
simultaneously over one communications medium by interleaving a piece of each signal one after another.
Time Domain Reflectometer (TDR) An instrument capable of measuring impedance characteristics of the USB
signal lines.
Glossary-12
Intel® PXA27x Processor Family Optimization Guide