A-1
Appendix A
Glossary
A
address:
The location of a word in memory.
addressing mode:
The method by which an instruction calculates the location
of an object in memory.
ALU:
arithmetic logic unit. The part of the CPU that performs arithmetic and
logic operations.
annul:
To cause an instruction to not complete its execution.
B
bootloader:
A built-in segment of code that transfers code from an external
source to program memory at power-up.
C
clock cycles:
Cycles based on the input from the external clock.
code:
A set of instructions written to perform a task; a computer program or
part of a program.
CPU cycle:
The period during which a particular execute packet is in a par-
ticular pipeline stage. CPU cycle boundaries always occur on clock cycle
boundaries; however, memory stalls can cause CPU cycles to extend
over multiple clock cycles.
D
data memory:
A memory region used for storing and manipulating data.
delay slot:
A CPU cycle that occurs after the first execution phase (E1) of
an instruction in which results from the instruction are not available.
Appendix A
