You're familiar with flip-flops that are triggered on the positive edge of the clock, or negative edge of the clock. A dual-edge triggered flip-flop is triggered on both edges of the clock. However, FPGAs don't have dual-edge triggered flip-flops, and always @(posedge clk or negedge clk) is not accepted as a legal sensitivity list.
Build a circuit that functionally behaves like a dual-edge triggered flip-flop:
(Note: It's not necessarily perfectly equivalent: The output of flip-flops have no glitches, but a larger combinational circuit that emulates this behaviour might. But we'll ignore this detail here.)
module top_module ( input clk, input d, output q );
- You can't create a dual-edge triggered flip-flop on an FPGA. But you can create both positive-edge triggered and negative-edge triggered flip-flops.
- This problem is a moderately difficult circuit design problem, but requires only basic Verilog language features. (This is a circuit design problem, not a coding problem.) It may help to first sketch a circuit by hand before attempting to code it.
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