Different results on hardware compared to simulator

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The most important issue is that a signal is viewed as clock if it is used to edge trigger any register since it will be connected to clk port of flips.

The safest thing for a beginner is one clock for all registers.

As to tristating inside fpga: you don't need that as it is going to be implemented as muxes and will complicate coding on you.

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Basically I have used the main clock to clock all the registers. But then the data in registers is decoded and enables lower level logic.

So, how can I implement a bi-directional bus?