10-04-2013, 03:22 PM
16 TO 1 MULTIPLEXER USING IC 74151 - (IC 74150)
ABSTRACT:
To study and simulate design of IC 74150 using VHDL.
THEORY:
Multiplexer IC 74151 is 8 to 1 multiplexer. It has 8 inputs and only one output based on the select inputs A, B, C it steers one of the input to the output Y. In 16 to 1 multiplexer design we use two 74151 IC’s. The design uses four select i/p’s S1(0), S1(1), S1(2), S1(3).The three select i/p’s S1(0), S1(1), S1(2) are connected to each individual IC74151. The fourth select i/p & its complement are given to the top mux is selected & otherwise the bottom mux is selected.
PROCEDURE:
The IC 74150 Design is entered through VHDL.
Simulate the design by applying test vectors-s1, i1 and observing output z1,
It is required to lock the pins and give timing constraints.
Implement the design by passing the design by various stages by mapping, time analysis and bit stream. For locking the pins write UCF file before implementation and guide the same through option set control files. Output of the implementation is .JED file, which can be directly programmed into target device FPGA.
The last step is programming in which the programme can physically download the architecture from computer to target device FPGA