Intel PXA27 Series Design Manual page 283

Glossary
GSM. Global System for Mobile Communications. A standard for how data is coded and transferred through the
wireless spectrum. The European wireless standard, also used in parts of Asia, GSM is an alternative to CDMA.
GSM digitizes and compresses data and sends it across a channel with two other streams of user data. GSM is based
on TDMA technology.
Hamming Distance. The distance (number of bits) between encoded values that can change without causing a
decode into the wrong value.
Handshake Packet. A packet that acknowledges or rejects a specific condition. For examples, see ACK and NAK.
HDML. Handheld Device Markup Language. HDML uses hypertext transfer protocol (HTTP) to display text
versions of web pages on wireless devices. Unlike WML, HDML is not based on XML. HDML does not allow
scripts, while WML uses a variant of JavaScript. Web site developers using HDML must re-code their web pages in
HDML to be viewed on the smaller screen sizes of handheld devices.
HARP. Windows CE standard development platform spec (Hardware Adaptation Reference Platform)
HD-CSP. High Density Chip Scale Package. Method for escape routing for copper-defined land pads that involves
routing signals on the two inner rows of balls in the chip scale package from the top layer to the inner PCB layers
for routing way from the package.
High Density Interconnect (HDI). PCB fabrication technology required for designing of escape routing, which is
the layout of package signals from underneath the chip scale package to other components on the PCB. The design
involves routing signals from the inner rows of balls on the ball pitch packages away from the packages.
High-bandwidth Endpoint. A high-speed device endpoint that transfers more than 1024 bytes and less than 3073
bytes per microframe.
High-speed. USB operation at 480 Mbps. See also Low-speed and Full-speed.
Host. The host computer system where the USB Host controller is installed. This includes the host hardware
platform (CPU, bus, and so forth) and the operating system in use.
Host Controller. The host's USB interface. See UHC.
Host Controller Driver (HCD). The USB software layer that abstracts the Host controller hardware. The Host
controller driver provides an SPI for interaction with a Host controller. The Host controller driver hides the
specifics of the Host controller hardware implementation.
Host Resources. Resources provided by the host, such as buffer space and interrupts. See also Device Resources
and Universal Serial Bus Resources.
HSTL. High-Speed Transceiver Logic
Hub. A USB device that provides additional connections to the USB.
Hub Tier. One plus the number of USB links in a communication path between the host and a function.
IMMU. Instruction Memory Management Unit, part of the Intel® XScale™ core.
I-Mode. A Japanese wireless service for transferring packet-based data to handheld devices created by NTT
DoCoMo. I-Mode is based on a compact version of HTML and does not currently use WAP.
I-cache. Instruction cache
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Intel PXA27x Processor Family Design Guide Glossary-7