![](http://datasheet.mmic.net.cn/290000/XPC801ZP25_datasheet_16187868/XPC801ZP25_530.png)
MOTOROLA
MPC801 USER’S MANUAL
23-1
23
SECTION 23
TERMINOLOGY
This section provides the definitions to some of the key terms, concepts, and acronyms used
in this document.
A
address demunging
effect of restoring the original address.
—Reversal of a munge operation on an address. This has the
address munging
address are exclusive-OR’ed with a three-bit value that depends on the length of the
operand (refer to the
PowerPC
Microprocessor Family: The Programming
Environments (MPGFPE/AD)
.
—Address modification in a way that the low-order three bits of the
ASID
—Address space ID
atomic cycle
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.
—If multiple bus transactions by a bus master occur in a sequence where
B
big-endian
at the highest address and vice versa. For example, a 32-bit wide data bus with
big-endian, the least-significant byte is located on data bus bits 24-31 and the
most-significant byte is on bits 0-7.
—An ordering of the bytes within a word where the least-significant byte is
blockage
unit is available for a subsequent instruction (AND has 1 clock latency and 1 clock
blockage).
—The interval from the time an instruction begins execution until its execution
breakpoint
routine.
—An event that forces the machine to branch into a breakpoint exception
bubble
diagrams.
—A number inside a circle that is used to identify specific terms in AC timing
burst
—A bus transfer that has more than one piece of data associated with it.