Computer science Test 1
what are the registers in a CPU
PC MDR MAR ACC
what does a PC stand for
program counter
what does a MAR stand for
memory address register
what does a MDR stand for
memory data register
what is a ACC
an accumulator
what does a PC do
keeps track of the memory address of the next instruction
what does a MAR do
holds the address for the current instruction
what does the MDR do
stores the data being transfered
what does a accumulator do
stores the results of arithmetic and logical operations
what does CU stand for
control unit
what does a control unit do
controls and manages the execution of instructions
Name 3 input devises
keyboard mouse button
three factors that effect the speed of the CPU
clock speed num of cores cache size
what is the first step of process
the PC shows which instruction to fetch next
what is the second step of process
the memory address in the PC is copied into MAR
what is the third step of process
the processor uses this address in the MAR to find the instruction or data in memory and put it in MDR
what is the fourth step of process
the CU decodes this instruction
what is the fifth step of process
the CU does the instruction the ACC is needed for maths and to hold the results before used
what is the sixth step of process
the PC is updated to hold the address of the next instruction
an example of the fifth
2+2 the result is stored in the accumulator (4) so it can be used in further calculations or sent to memory
what does the cache do
stores data so that future requests for that data can be served faster
what does the register do
store and decode data during the execution of instructions
what does the ALU do
the ALU in the computer performs arithmetic and logical operations
what is hardware and name one
the physical device like the monitor
what is software and name one
the non physical component of a computer like apps
what happens in the FDE cycle fetch
the operation is fetched
what happens in the FDE cycle decode
the operation is decoded by the CPU
what happens in the FDE cycle execute
performing the operation
who made the idea of the CPU
Von Neumann
what is a embedded system and name one
a system that performs only one kind of action like a coffee machine
what is the clock speed
the rate at which a computer's central processing unit CPU executes instructions
What does ",Panda Monkeys Make Many Cool Pictures," mean? (Fetch)
P - PC
M - MAR
M - MDR
M - CIR
C - CU
P - PC++
What does ",Curious Owls Understand Difficult Commands." mean? (Decode)
C - Control Unit takes the instruction from the MDR
O - Opcode and operand are identified
U - The CU understands what the instruction is asking
D - CU prepares the necessary Data paths or components (ALU, memory, etc.)
C - The instruction is now ready to be carried out
What does ",Elephants Always Love Running Everywhere," man? (Execute)
E - Execute the decoded instruction
A - Use the ALU if it’s a calculation
L - Load or store data if needed
R - Registers are updated with results
E - Results are sent Everywhere needed (memory, output, next operation, etc.)