Explain the function of the 74LS138 decoder chip 04 Harvard

Explain the function of the 74LS138 decoder chip. 0.4 Harvard and von Neumann CPU Architectures Identify the purpose of the following CPU resources. Registers ALU PC Instruction decoder

Solution

18.)

Registers: Register is a temporary storage component which is used to store the frequently refered data, this means that the data which is accessed more number of times is usually put into registers because response time of registers are really fast.

ALU: Arithmetic logic unit is a circuit which is digital and that carries all the arithmetic operation and logic operation on operand in the form of instructions. in some of the processors it is dividied into two units one is Arithmetic unit and the other one is Logic unit.

PC (Program Counter): It is used to hold the starting instruction and immediately point the next instruction address. This means that program counter will have a hold of current instruction but also gives you information about which instruction is going to be executed immediately after the current one finishes.

Instruction decode: Instruction decoder is a circuit that decodes an opcode.