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ECE 564 (001) Fall 2025 ASIC and FPGA Design with Verilog
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Consider the following code implemented exactly as described.
reg A, B, C, D;
always@(posedge clock)
begin
A <= (A & B) | (C & D);
B <= B ^ C;
C <= A ^ D;
D <= A ^ C;
end
Each logic gate has a delay of (1:2:3) (min:typ:max).
If the clock period is 20 ns, and clock uncertainty is 1 ns, then what is the hold margin in this design. If hold is met, then the answer is positive (or 0). If hold violations do occur, then the answer is negative.
What is wrong with the following code fragment. More than one thing might be wrong. You lose answers for an incorrect choice. Note, this is the entire module - there is no additional code
Module fubar (input clock; input [1:0] A; input S; output reg B, C, D);
always@(clock)
if (S) C<=D;
always@(*)
begin
if (S) D <= ^A;
C <= |D;
end
endmodule
You have a critical path that includes a multiplier C=A*B, where A and B can be any number. It’s the critical path, the longest path in the design by at least a factor of 2 (measured post-compile). Which is the best strategy to deal with it?