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test and branch instruction
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The part of a computer system that receives input from a keyboard or mouse is the?
CPU - trust me I already took the test! :)
What is address sequencing in computer organization?
Microinstructions are stored in control memory in groups, with each group specifying routine. Each computer instruction has its own microprogram routine in control memory to generate the microoperations that execute the instruction. The hardware that controls the address sequencing of the control memory must be capable of sequencing the microinstructions within a routine and be able to branch from one routine to another. To appreciate the address sequencing in a microprogram control unit, let us enumerate the steps that the control must undergo during the execution of a single computer instruction. An initial address is loaded into the control address register when power is turned on in the computer. This address is usually the address of the first microinstruction that activates the instruction fetch routine. The fetch routine may be sequenced by incrementing the control address register through the rest of its microinstructions. At the end of the fetch routine, the instruction is in the instruction register of the computer. The control memory next must go through the routine that determines the effective address of the operand. A machine instruction may have bits that specify various addressing modes, such as indirect address and index registers. The effective address computation routine in control memory can be reached through a branch microinstruction, which is conditioned on the status of the mode bits of the instruction. When the effective address computation routine is completed, the address of the operand is available in the memory address register. The next step is to generate the microoperations that execute the instruction fetched from memory. The microoperation steps to be generated in processor register depend on the operation code part of the instruction. Each instruction has its own microprogram routine stored in a given location of control memory. The transformation from the instruction code bits to an address in control memory where the routine is located is referred to as a mapping process. A mapping procedure is a rule that transforms the instruction code into a control memory address. Once the required routine is reached, the microinstructions that execute the instruction may be sequenced by incrementing the control address register, but sometimes the sequence of microoperations will depend on values of certain status bits in processor registers. Micro programs that employ subroutines will require an external register for storing the return address. Return addresses cannot be stored in ROM because the unit has no writing capability. When the execution of the instruction is completed, control must return to the fetch routine. This is accomplished by executing an unconditional branch microinstruction to the first address of the fetch routine. In summary, the address sequencing capabilities required in control memory are: 1. Incrementing of the control address register. 2. Unconditional branch or conditional branch, depending on statues bit conditions. 3. A mapping process from the bits of the instruction to an address for control memory. 4. A facility for subroutine call and return.
What are the four distinct actions that a machine instruction can specify?
• The processor fetches the instruction from memory • Program counter (PC) holds address of the instruction to be fetched next • PC is incremented after each fetch • Fetched instruction loaded into instruction register
Which instruction set is used by the itaniums processors?
EPIC, which stands for Explicitly Parallel Instruction Computing.
What are the five stages in DLX pipeline in computer architecturect?
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
Which group of instruction do not affected the flag in microprocessor?
branch instruction
What is a conditional BRANCH statement?
Not "conditional BRANCH statement" but "conditional branch statement". In computer code it means some branch (jump) instruction who's destination location depends on the result of some test before jumping. conditional jump: IF a=something THEN GO TO (jump, branch) some location unconditional jump: GO TO location (just do the jump)
What happens when branch instruction comes in 8086?
When a branch (or "jump") instruction is executed, the condition codes bits (in the flag register) determine whether or not the Program Counter (PC register) is changed to the Effective Address specified by the instruction; if not, then the PC is unchanged.
What is inter segment branch instruction?
The intersegment branch (or far branch) in the 8086/8088 is a branch where both the Instruction Pointer (IP) and the Code Segment(CS) registers are loaded at the same time. You can branch anywhere in memory with an intersegment branch. Contrast this with an intrasegment branch (or near branch) where only the IP register is loaded. Since the CS register is not loaded, the domain of the branch is only the 64kb segment currently selected by CS.
Is the purpose of the executive branch is because to make laws?
The executive branch is meant to carry out the powers of federal government...this branch is headed by the President...The legislative branch is the one meant to make the laws...:)
A PC relative mode branch instruction is stored in memory at address 620 The branch is made to location 530 the address field in the instruction is 10 bits long what is the binary value of the inst?
Copied from discussion, as no response has been received from the discussion... There is no branch or jump instruction in the 8085 or 8086/8088 that has a 10 bit address field. Please specify what microprocessor to which you are referring.
List the unconditional branch instruction in 8086 with examples?
JUMP RET CALL RETI RETN RETF These are unconditional branch instructions By, Satish G.Patil
What is copnditional branch?
In programming, an instruction that directs the computer to another part of the program based on the results of a compare.
What is the instruction to the bank on a crossed bank?
IF you meant 'on a crossed cheque' - it's an instruction to the bank, to credit the value of the cheque to the payee's account - rather than handing over the cash.
How do doctors test your bones?
It is hard to know what is meant by "test" in this setting. A common "test" for bones is an xray.
What will happen if a test tube was heated without a water bath?
When the test tube containing chemical instructed to heat by water bath, it might meant to control a steady heating rate or the reaction required a certain range of temperature. It couldn't be told if direct heating would bring any harm, but the instruction in the science lab should meant something. It is best to ask with your science teacher on the specific experiment that was instructed to use water bath as heat medium. P.S. Don't attempt anything outside the instruction in the lab unless you know exactly what is the nature of reaction and its' hazard.
Can road test be given in one state with instruction permit of another state?
Yes It can!
