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Consider a 2 - by - 2 switch. It has two input data ports, x ( 0 ) and x ( l ) , and
Consider a by switch. It has two input data ports, x and xl and a bit
control signal, ctrl The input data are routed to output ports y and y I according
to the ctrl signal. The function table is specified below.
CONCURRENT SIGNAL ASSIGNMENT STATEMENTS OF VHDL
Input Output Function
ctrl yl y
xi x pass
x xi cross
x x broadcast x
xi xi broadcast xi
a Use concurrent signal assignment statements to derive the circuit.
b Draw the conceptual diagram.
c Expand it into gatelevel circuit and derive the simplified logic expression in
sumofproducts format.
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