10-04-2013, 03:29 PM
UNIVERSAL SHIFT REGISTER (IC 74194)
ABSTRACT:
To study and simulate IC 74194using VHDL.
THEORY:
The IC 74194 is an MSI 4-bit bi-directional parallel-in and parallel-out shift-register. The `194 is called bi-directional shift-register because they shift in either of two directions, depending on the control input. The directions are called left and right. In the’194the left means “in the direction from QA to QD, Right means “in the direction from QD to QA.
PROCEDURE:
The IC 74194 Design is entered through VHDL.
Simulate the design by applying test vectors- i, clk and observing output d.
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.