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the accumulator is an 8-bit register then is part of the arithmetic/logic unit(ALU). this register is used to store to store 8-bit data and to perform arithmetic & logical operation. the result of an operation is stored in the accumulator. the accumulator is also identified as register A.
The TMP register in the 8085 is used to hold temporary results of operations. You cannot directly manipulate it, so you should just pretend it is not there.
The ALU (arithmetic logic unit) An ALU loads data from input registres, an external Control Unit then tells the ALU what operation to perform on that data, and then the ALU stores its result into an output register. Other mechanisms move data between these registers and memory.
the structure of microprocessor consists of ALU, Register array unit and control unit.
diffent types of register, memory,ALU,timing and control unit
A register is a storage location within the CPU as part of Datapath. CPU consists of datapath and control unit. Datapath comprises of register file (which consists registers and logic ) ,ALU and memory.
No. The Arithmetic Logic Unit hades basic mathematical operations such as addition, subtraction, multiplication, division as well as logical and register operations such as and, or, and bit shifting.
combinational ALU
There is one main difference between combinational ALU and sequential ALU. Combinational ALU depends only on present circuits, and sequential ALU depends on both the present and the past.
1 Fetch Instruction from Memory 2 Decode Instruction and Fetch Operands 3 Perform ALU Operations 4 Memory Access (for load/store)5 Store ALU result to register file 6Update PC
DLX is a simple pipeline architecture for CPU. It is mostly used in universities as a model to study pipelining technique.The architecture of DLX was chosen based on observations about most frequently used primitives in programs. DLX provides a good architectural model for study, not only because of the recent popularity of this type of machine, but also because it is easy to understand.Like most recent load/store machines, DLX emphasizes A simple load/store instruction setDesign for pipelining efficiencyAn easily decoded instruction setEfficiency as a compiler targetOperations There are four classes of instructions: Load/StoreAny of the GPRs or FPRs may be loaded and stored except that loading R0 has no effect.ALU OperationsAll ALU instructions are register-register instructions.The operations are :- add- subtract- AND- OR- XOR- shiftsCompare instructions compare two registers (=,!=,,=).If the condition is true, these instructions place a 1 in the destination register, otherwise they place a 0.Branches/JumpsAll branches are conditional.The branch condition is specified by the instruction, which may test the register source for zero or nonzero.Floating-Point Operations- add- subtract- multiply- divideAn Implementation of DLXImplementing the instruction set requires the introduction of several temporary registers that are not part of the architecture.Every DLX instruction can be implemented in at most five clock cycles. The five clock cycles are Instruction fetch cycle (IF)Instruction decode/register fetch (ID)Execution/Effective address cycle (EX)Memory access/branch completion cycle (MEM)Write-back cycle (WB)Detailed description of each follows:Instruction fetch cycle (IF):IR
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