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1.1 Sys Architecture
- Registers
- MAR
- Holds memory address about to be used by the CPU
- Holds memory address about to be used by the CPU
- MDR
- Holds data or instructions that have been fetched from memory
- Holds data or instructions that have been fetched from memory
- Program Counter
- Holds the memory address of the instruction for each cycle
- Holds the memory address of the instruction for each cycle
- Accumulator
- Stores the results of the calculations done by the ALU
- Stores the results of the calculations done by the ALU
- MAR
- FDE cycle
- Fetch
- Decode
- Execute.
- Fetch
- Characteristics
- Clock speed
- Number of instructions
that can be carried out in
a second (Hz) - These days
in Ghz (Billion)
- Number of instructions
that can be carried out in
a second (Hz) - These days
in Ghz (Billion)
- Cache size
- Refers to how many
frequently used
instructions can be
stored in the cache on
the CPU.
- Refers to how many
frequently used
instructions can be
stored in the cache on
the CPU.
- Number of cores
- How many individual
processors (cores) are on a
chip. The more cores, the
more instructions can be
done simultaneously.
- How many individual
processors (cores) are on a
chip. The more cores, the
more instructions can be
done simultaneously.
- Clock speed
- Embedded systems
- A computer system built into
another device (usually
designed for a specific purpose)
- A computer system built into
another device (usually
designed for a specific purpose)
- Components
- ALU
- Performs logical operations
(AND, OR, NOT), Shift
operations and Arithmetic
operations (+,-, *, / )
- Performs logical operations
(AND, OR, NOT), Shift
operations and Arithmetic
operations (+,-, *, / )
- Control Unit (CU)
- Controls activities in the CPU (Such as
flow of data between CPU and other
parts) and makes FDE cycle happen in
correct order
- Controls activities in the CPU (Such as
flow of data between CPU and other
parts) and makes FDE cycle happen in
correct order
- Cache
- Sits between the CPU and RAM.
Very fast. Holds frequently used
data so that the processor doesn't
have to keep going back and forth
to the RAM.
- Sits between the CPU and RAM.
Very fast. Holds frequently used
data so that the processor doesn't
have to keep going back and forth
to the RAM.
- ALU
- Purpose of the CPU
- Central processing Unit -
This processes all of the
data and instructions that
make a computer system
work
- Central processing Unit -
This processes all of the
data and instructions that
make a computer system
work
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