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TERMINOLOGY
atomic cycle
If multiple bus transactions by a bus master occur in a sequence where the master
retains ownership of the bus during the duration of the sequence, thus preventing other
master(s) from transferring in the middle of the sequence, the sequence is considered
atomic.
autobaud
The process of determining a serial data rate by timing the width of a single bit.
big-endian
Big-endian ordering assigns the lowest address to the highest order (leftmost) eight bits
of the scalar. This called big-endian because the big end of the scalar, considered a
binary number, comes first in memory.
breakpoint
An event that forces the machine to branch into a breakpoint exception routine.
burst
A bus transfer that has more than one piece of data associated with it.
burst length
The number of data associated with a burst cycle. For example, a burst length of four
has four data pieces (four beats) associated with it.
copyback
Updates to external memory are delayed until forced by the user program or a transfer
of bus control to an external master. At the time of forced update or relinquishment of
the bus, all changes to the cache are written to external memory. Until that time, cache
and external memory are not coherent.
critical-data first
This feature allows the data transferred during the burst cycle to be organized where
the word or data needed first is the first one to transfer within the burst-data block. The
order of transferring can be sequential and usually wraps back to the word (or data)
zero. For example, 1 → 2 → 3 → 0 for a sequence of four data with data 1 as the critical
data.
critical-word first
The word that the processor wants first.
datastream
A sequence of information to be processed by the core.
MOTOROLA
MPC823e REFERENCE MANUAL
Terminology
24-3
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