# What is largest positive value we can represent using LC-3 add instruction with immediate addressing?

## What is largest positive value we can represent using LC-3 add instruction with immediate addressing?

What is the largest positive number we can represent literally (i.e., as an immediate value) within an LC-3 ADD instruction? The imm5 field is in 2’s complement representation and has 5 bits, so the largest number we can represent is 2^(n-1) – 1 = 2^4 – 1 = 15.

## How many times does the LC-3 make a read or write request to memory during the processing of the LD instruction?

During the processing of LD instruction: LC3 while processing the LD instruction two times read or write request to memory is done.

4 bits

7 bits

32 bits

## How many opcodes are there?

Usually an opcode will fit into a single memory access, and then the answer is 2^12. But a processor could implement a multi-cycle opcode decoding process to extend the number of possible opcodes beyond 2^12. The maximum number of instructions (containing opcodes) that the processor can directly address.

## What is the size of an instruction?

Instruction length Processors used in personal computers, mainframes, and supercomputers have instruction sizes between 8 and 64 bits. The longest possible instruction on x86 is 15 bytes (120 bits). Within an instruction set, different instructions may have different lengths.

## Is 3 byte A instruction?

Three-byte instructions – Three-byte instruction is the type of instruction in which the first 8 bits indicates the opcode and the next two bytes specify the 16-bit address. The low-order address is represented in second byte and the high-order address is represented in the third byte.

## How many types of instruction formats are there?

An instruction is of various length depending upon the number of addresses it contain. Generally CPU organization are of three types on the basis of number of address fields: Single Accumulator organization. General register organization.

## When an instruction is read from the memory it is called?

When an instruction is read from the memory, it is called Share. Memory Read cycle. Fetch cycle. Instruction cycle. Memory write cycle.

## What is the main purpose of having memory hierarchy?

In computer architecture, the memory hierarchy separates computer storage into a hierarchy based on response time. Since response time, complexity, and capacity are related, the levels may also be distinguished by their performance and controlling technologies.

## Is used to store data in registers?

Computer Science Engineering (CSE) Question A D- flip flop has a latch which is used to store 1 bit data. Hence D-flip flop is used for data storage. This discussion on _______ is used to store data in registers.

## Which register is initialized first when the program is being executed?

4. During the execution of a program which gets initialized first? Explanation: For the execution of a process first the instruction is placed in the PC. 5.

## Which format is usually used to store data?

Discussion Forum

Que. The ______ format is usually used to store data .
b. Decimal
d. Octal

## Which register can interact with memory?

In a computer, the memory address register (MAR) is the CPU register that either stores the memory address from which data will be fetched to the CPU, or the address to which data will be sent and stored.

## Which register is connected to the MUX?

Which register is connected to the MUX? Explanation: The MUX can either read the operand from the Y register or increment the PC. Explanation: This is basically used in systems without edge-triggered flip flops.

## What does the run signal do?

What does the RUN signal do? Explanation: The RUN signal increments the step counter by one for each clock cycle. 7. The name hardwired came because the sequence of operations carried out is determined by the wiring.

## Which register is directly connected to data bus?

The outputs of all the registers except the OUTR (output register) are connected to the common bus. The output selected depends upon the binary value of variables S2, S1 and S0….Various Registers:

Abbreviation Register name
IR Instruction register
INPR Input register
AC Accumulator
DR Data register

## What are the 3 types of buses?

Three types of bus are used.

• Address bus – carries memory addresses from the processor to other components such as primary storage and input/output devices.
• Data bus – carries the data between the processor and other components.
• Control bus – carries control signals from the processor to other components.

## Which micro operations carry information from one register to another?

Types of Micro-Operations Register transfer micro-operations transfer binary information from one register to another. Arithmetic micro-operations perform arithmetic operations on numeric data stored in registers. Logic micro-operations perform bit manipulation operation on non-numeric data stored in registers.

## What is meant by register transfer language?

A register transfer language is a system for expressing in symbolic form the microoperation sequences among the registers of a digital module. It is a convenient tool for describing the internal organization of digital computers in concise and precise manner.

## What does RTL stand for?

RTL

Acronym Definition
RTL Radio Timor Leste (East Timor)
RTL Real Time Logic
RTL Register Transfer Logic (semiconductors)

## What are registers and its types?

A register is a temporary storage area built into a CPU. Most modern CPU architectures include both types of registers. Internal registers include the instruction register (IR), memory buffer register (MBR), memory data register (MDR), and memory address register (MAR).

## How DMA improves system performance?

Direct memory access (DMA) improves system performance by allowing external devices to transfer information directly to or from the PC’s memory without using the CPU. The DMA request signal (DRQ) triggers a DMA operation, and the DMA acknowledge signal (DACK) authorizes the 8237 to start the data transfer.

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