Unit 4- Processor Fundamentals
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What does an AND logic gate mean?
1 and 1=1, 0+0=0 and 1+0=0
What does an address bus carry?
Carries the memory location address, one way, to the I/O controllers and memory
What does a XOR logic gate mean?
0 XOR 1=1,0 XOR 0= 0 and 1 XOR 1= 0
What does the NAND logic gate mean?
It combines AND, OR and NOT gates together ‘Universal’ gate
What is a word?
Equal memory units
What’s a bus?
Wire in the CPU that connects all the parts together
What does an OR logic gate mean?
It’s like choosing between nothing/a gift, two gifts or nothing at all
Define device driver
Software that convert between OS and peripheral signals
What does does the control bus carry?
The coordinating signal from the CU to other CPU parts
What does a NOT logic gate mean?
If it’s not 1, it’s 0 and vice versa
What does a data bus carry?
Transporta data bidirectionally
What is immediate addressing?
Operand=number instruction’s using
What’s direct addressing?
Operand=address of number
What’s indirect addressing?
Operand=address of the address instruction needs to use
What’s indexed addressing?
Operand=Index Register+value’s address
What’s relative addressing?
Operand=the number that shows the difference between the current address and the address to be used For example if the location is 6 and the operand=3 then the location needed is 9