Glossary
Glossary-2 Copyright © 2009 ARM Limited. All rights reserved. ARM DDI 0432C
Non-Confidential ID112415
AHB Access Port (AHB-AP)
An optional component of the DAP that provides an AHB interface to a SoC.
AHB-AP See AHB Access Port.
AHB-Lite A subset of the full AMBA AHB protocol specification. It provides all of the basic
functions required by the majority of AMBA AHB slave and master designs,
particularly when used with a multi-layer AMBA interconnect. In most cases, the extra
facilities provided by a full AMBA AHB interface are implemented more efficiently by
using an AMBA AXI protocol interface.
Aligned A data item stored at an address that is divisible by the number of bytes that defines the
data size is said to be aligned. Aligned words and halfwords have addresses that are
divisible by four and two respectively. The terms word-aligned and halfword-aligned
therefore stipulate addresses that are divisible by four and two respectively.
AMBA See Advanced Microcontroller Bus Architecture.
Architecture The organization of hardware and/or software that characterizes a processor and its
attached components, and enables devices with similar characteristics to be grouped
together when describing their behavior, for example, Harvard architecture, instruction
set architecture, ARMv6-M architecture.
Big-endian Byte ordering scheme in which bytes of decreasing significance in a data word are
stored at increasing addresses in memory.
See also Little-endian and Endianness.
Big-endian memory Memory in which:
• a byte or halfword at a word-aligned address is the most significant byte or
halfword within the word at that address
• a byte at a halfword-aligned address is the most significant byte within the
halfword at that address.
See also Little-endian memory.
Breakpoint A breakpoint is a mechanism provided by debuggers to identify an instruction at which
program execution is to be halted. Breakpoints are inserted by the programmer to enable
inspection of register contents, memory locations, variable values at fixed points in the
program execution to test that the program is operating correctly. Breakpoints can be
removed after the program is successfully tested.
See also Watchpoint.
Byte An 8-bit data item.
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