1. a. A car plant starts only if at least three out of four keys (X1,...

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1. a. A car plant starts only if at least three out of four keys (X1, X2, X3, X4) are inserted. When the plant is idle minimum of two keys are inserted. If an inserted key and the mains switch is ON produce logic 1, design a minimal circuit to achieve this using NAND-Gates only. [10 marks] [2 marks] b. Explain the difference between behavioral and structural in VHDL. c. Write a VHDL code to implement la. [8 marks] 1. a. A car plant starts only if at least three out of four keys (X1, X2, X3, X4) are inserted. When the plant is idle minimum of two keys are inserted. If an inserted key and the mains switch is ON produce logic 1, design a minimal circuit to achieve this using NAND-Gates only. [10 marks] [2 marks] b. Explain the difference between behavioral and structural in VHDL. c. Write a VHDL code to implement la. [8 marks]