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Glossary
Half Word
In the 32-bit LH79524/LH79525, a 16-bit data element structured as an ordered pair
of bytes. Half words in this User's Guide are shown with the most significant byte on
the left (or top) and the least significant byte on the right (or bottom). Also see Byte,
Nibble, and Word.
HCCA
Host Controller Communication Area (USB)
2
I
C
Bidirectional, two wire serial bus providing a communication link between integrated circuits.
IEEE 802.3
The IEEE specification defining Ethernet. The full specification is available at:
http://standards.ieee.org/getieee802/
Interrupt Controller
A block that provides a uniform way of enabling, disabling, and examining the status of
interrupt sources. The LH79524/LH79525 uses a Vectored Interrupt Controller (VIC).
IRQ
Interrupt Request. The hardware responds to an IRQ by saving some registers and moving
execution to the address provided by the VIC for interrupt handling software. IRQ interrupts
are lower priority than FIQ. See FIQ.
Isochronous Data
A continuous stream of data delivered at a steady rate.
IrDA
A serial, half-duplex optical communications protocol sponsored by the InfraRed
Data Association.
Jabber
An Ethernet node continuously sending data. A jabbering station is one whose circuitry or
logic has failed, and which has locked up a network channel with incessant transmission.
Little-endian
The least significant part of the data is stored at the lowest storage address or transmitted
or received first. The LH79520 uses little-endian byte ordering for storage. See Endianness.
LSB; LSb
Least significant byte (LSB) or least significant bit (LSb) of an ordered sequence.
LSW
Least significant word of an ordered sequence.
20-4
Version 1.0
LH79524/LH79525 User's Guide
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