Terminology
MOTOROLA
MPC823e REFERENCE MANUAL
24-5
TERMINOLOGY
24
no operation (NOP)
An instruction whose sole function is to increment the program counter, but which
affects no changes to any registers or memory.
scoreboard
A register tracking system that ensures that values are not pulled from a register before
they are updated by a previous instruction.
sequential instruction
Any instruction that is not a flow control instruction and not ISYNC.
slave
A device that responds to the master’s address. A slave receives data on a write cycle
and gives data to the master on a read cycle.
snoop
The act of monitoring external bus activity by alternate bus masters. By snooping these
external accesses, a core can identify accesses to memory locations that contain dirty
data and possibly halt activity to supply correct data.
swap
Four byte lanes, reversing (lane 0 to lane 3, lane 1 to lane 2, lane 2 to lane 1 and lane
3 to lane 0).
tablewalk
An index value is used to identify an entry point in a tree structure that is traversed until
a pointer is found. The system walks through a table of pointers to its end.
transaction
A bus transaction consists of an address transfer (address phase) and data transfers
(data phase).
time-division multiplex (TDM)
Any serial channel that is divided into channels separated by time.
watchpoint
An event that is reported, but does not change the timing of the machine.
word
A word consists of 4 bytes or 32 bits.
writethrough
Continuous updates, as they occur, of external memory so that cache and memory
maintain coherency at all times.
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