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What is backward reference in assembler?
In assembly language, a backward reference is when a program refers to a label or memory location that appears earlier in the code. This is commonly used for implementing loops or conditional jumps where the target instruction is located before the jump instruction in memory. Backward references are resolved during the assembly process to calculate relative offsets.
List and briefly define the possible states that define an instruction execution?
The possible states that define an instruction execution are as follows: Instruction address calculation - Determine the address of the next instruction to be executed. Instruction fetch - Read instruction from its memory location into the processor. Instruction operation decoding - Analyze instruction to determine type of operation to be performed and operand to be used. Operand address calculation - If the operation involves reference to an operand in memory or available via I/O, then determine the address of the operand. Operand fetch - Fetch the operand from memory or read it in from I/O. Data operation - Perform the operation indicated in the instruction. Operand store - Write the result into memory or out to I/O.
What is the difference between load and store instruction?
Load instruction means to load the instruction from the memory to the processor (accumulator).. But store instruction is opposite of it,it stores information from accumulator to the memory.
How many times does the CPU need to refer to memory when it fetches and excutes an indirect addressing mode instruction if the instruction is a branch?
In indirect addressing mode for a branch instruction, the CPU typically needs to refer to memory twice. First, it fetches the address of the target instruction from the memory location specified by the operand. Then, it uses that fetched address to access the actual target instruction in memory. Thus, the total is two memory accesses for executing an indirect branch instruction.
How program instructions transfer in and out of memory?
The instructions have to remain in memory at all times while the program is running. They get there by loading the entire program into memory. The CPU's instruction registers keep track of the current instruction and the next instruction.
What is the difference between a direct and indirect address instruction how many references to memory are needed for each type of instruction to bring an operand into a processor register?
Direct address instructions specify the memory location of the operand directly within the instruction itself, requiring only one memory reference to fetch the operand. In contrast, indirect address instructions specify a memory location that contains the address of the operand, necessitating two memory references: one to retrieve the address and another to fetch the operand itself. Therefore, direct addressing is more efficient in terms of memory access.
When an instruction is read from the memory it is called?
When an instruction is read from memory, it is called "fetching." This process is part of the instruction cycle, where the Central Processing Unit (CPU) retrieves an instruction from memory to execute. Fetching is the initial step, followed by decoding and executing the instruction. This sequence is essential for the proper functioning of a computer's processing capabilities.
The first instruction in the ROM BIOS startup program is always assigned to?
Memory address FFFF0h is the memory address always assigned to the first instruction in the ROM BIOS
Is instruction opcode a type of memory?
The instruction opcode is a type of data contained in memory, pointed to by the PC (Program Counter) register.
How many references are needed for each type of instruction to bring an operand into a processor?
Indirect addressing needs 2 reference to memory
What is the name of the cycle in which an instruction is taken from memory and loaded into the instruction register?
Fetch
What is defference between direct and indirect address?
The I bit is 0 so the instruction is recognice as a direct address instruction The indirect address instruction needs 2 referance to memory to fetch & opened The I bit is 1 so the instruction is recognice as a indirect address instructionhe
