A microoperation is an elementary operation performed on the information stored in one or The symbolic notation used is called a register transfer language. Register Transfer and Microoperations: Register Transfer Language – Register . Complements are used to simplify the subtraction operation and for logical. Lec3 - Register/Data Transfer micro-operation | Computer Architecture and Organisation. Palak Jain.


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Shift Microoperations Shift microoperation can be used for serial transfer of data. They are used generally with the arithmetic, logic, and other data-processing operations. The contents of a register can be shifted to the left or the right. During a shift-right operation the serial input transfers a bit into the leftmost position.

The serial input transfers a bit register transfer micro operation the rightmost position during a shift-left operation.

There are three types of register transfer micro operation, logical, circular and arithmetic.

Register Transfer language and Micro operation,Types of Micro operations | ColorMag

Logical shift A logical shift operation transfers 0 through the serial input. We use the symbols shl and shr for logical shift left and shift right microoperations, e.

Circular shift The circular shift is also known as rotate operation. It circulates the bits of the register around the two ends and there is no loss register transfer micro operation information.

This is accomplished by connecting the serial output of the shift register to its serial input.

RTL - Register Transfer Level. Micro operations -arithmetic, logical and shift

We register transfer micro operation the symbols cil and cir for the circular shift left and circular shift right. Arithmetic Shift An arithmetic shift micro operation shifts a signed binary number to the left or right.

The effect of an arithmetic shift left operation is to multiply the binary number by 2.


Similarly an rithmetic shift right divides the number by 2. Because the sign of the number must remain the same arithmetic shift-right must leave the sign bit unchanged, when it is multiplied or divided by 2.

The left most bit in a register holds the sign bit, and the remaining bits hold the number. The sign bit is 0 register transfer micro operation positive and 1 for negative. Following figure shows a typical register of n bits.

Rn-2 is the most significant bit of the number and R0 is the least significant bit.

Chapter 4. Register Transfer and Microoperations

Register transfer micro operation arithmetic shift-right leaves the sign bit unchanged and shifts the number including the sign bits to the right.

Thus Rn-1 remains the same, Rn-2 receives the bit from Rn-1, and so on for other bits in the register. Hardware Implementation A combinational circuit shifter can be constructed with multiplexers as shown in below Fig. The 4-bit shifter has four data inputs, A0 through A3 and four data register transfer micro operation, H0 through H3.

There are two serial inputs, one for shift left I L and the other for shift right IR. The function table in Fig.

A shifter with n data inputs and outputs requires n multiplexers. The two serial inputs can be controlled by another multiplexer to provide the three possible types of shifts. Arithmetic Logic Shift Unit Computer systems employ register transfer micro operation number of storage registers connected to a common operational unit called an arithmetic logic unit, abbreviated ALU.

Different types of micro-operations - Computer architecture and design

To perform a micro operation, the contents of specified registers are placed in the inputs of the register transfer micro operation AW.

The AW performs an operation and the result of the operation is then transferred to a destination register. The AW is a combinational circuit so that the entire register transfer operation from the source registers through the ALU and into the destination register can be performed during one clock pulse period.