Block Diagram Of 4 Bit Alu

1 2 major parts of alu arithmetic block. Input b stored in shift register during first clock cycle 8 bits of input a i e. Block diagram of the alu top module consist of 3 bit adder subractor multiplier and comparator as a port mapped components and 2 bit mux to select the output result.

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For behavioural implementation of alu refer the vhdl code for 4 bit alu.

Block diagram of 4 bit alu. This block will select one of the 6 main units based on the operation code. Alu is a combinational circuit that performs logic and arithmetic micro operations on a pair of n bit operands ex. Don t make your own. The alu will generate an 8 bit result result a one bit carry c and a one bit zero bit z.

As the block diagram shows the alu has two internal 4 bit buses connected to the 8 bit register bus. 4 selection lines are to perform the operations on two 4 bit inputs in both the units. Generates first partial product. The 5th select line is used to select either one of the units.

The low bus provides access to bits 0 1 2 and 3 of registers while the high bus provides access to bits 4 5 6 and 7. A7 a6 a5 a4 a3 a2 a1 a0 anded with bit b0. The 4 outputs of each unit are connected to 4 inputs of the 4 and gates. Vhdl code for top module alu.

Please make sure you use the same variable name as the ones used in this lab. Below is the block diagram detailing the process by which the multiply operation is performed. There are six 4x2 bit and blocks one for each main function. Design a 4 bit alu that implements the following set of operations with only the following components assume 2 s complement number representation no need to implement overflow circuit 1 bit full adders fa 2 input and or xor gates.

The system block diagram of a 4 bit alu is shown in the figure 1 6. The alu uses latches to store the operands until it can use them. 12 2 2011 4 01 18 pm. It has 5 bit input consisting of four 2 bit and gates inside.

This block is used to perform arithmetic operations such as addition subtraction and comparison. 4x2 bit and aka 5 bit and in our project files. Alu block diagram the alu that you will build see figure 1 will perform 10 functions on 8 bit inputs see table 1. Input a latched into a register.