需要帮助构建 T 和 JK 触发器

Question

T Flip Flop
D flip flop
D latch

I need to build a T and JK flip flop. I am able to create the d latch and d flip flop which both seem to work correctly. However, after I try to add the nor gate to create a T Flip Flop it doesn't produce any results on the vector waveform. Same thing happens when I try to make the JK FF from the D flip flop.

Answer 1

You do not specify how you try to build them so it's hard to guess the exact problem.

A T-FF implemented in VHDL with std_logic would need a reset to get out of the initial 'U' in the storage element. This 'U' is fed back through the XOR and keeps the FF in 'U' with no way to remove it.

If that is your problem, add a reset input.