User manual

Glossary

Domain A collection of sections, large pages and small pages of memory, which can have their

access permissions switched rapidly by writing to the Domain Access Control Register

(CP15 register c3).

Do Not Modify (DNM)

In Do Not Modify fields, the value must not be altered by software. DNM fields read as

Unpredictable values, and must only be written with the same value read from the same

field on the same processor.

Throughout this manual, DNM fields are sometimes followed by RAZ or RAO in

parentheses to show which way the bits should read for future compatibility, but

programmers must not rely on this behavior.

Doubleword A 64-bit data item. The contents are taken as being an unsigned integer unless otherwise

stated.

Doubleword-aligned

A data item having a memory address that is divisible by 8.

EmbeddedICE logic An on-chip logic block that provides TAP-based debug support for ARM processor

cores. It is accessed through the TAP controller on the ARM core using the JTAG

interface.

EmbeddedICE-RT The JTAG-based hardware provided by debuggable ARM processors to aid debugging

in real-time.

Embedded Trace Buffer

The ETB provides on-chip storage of trace data using a configurable sized RAM.

Embedded Trace Macrocell (ETM)

A hardware macrocell which, when connected to a processor core, outputs instruction

and data trace information on a trace port. The ETM provides processor driven trace

through a trace port compliant to the ATB protocol.

Endianness Byte ordering. The scheme that determines the order in which successive bytes of a data

word are stored in memory. An aspect of the system’s memory mapping.