The design of a programmable interval timer, 8253 to complete the function, realize the following requirements: 1, contains three independent 16-bit counter, capable of three independent 16-bit count. 2, each with six counter mode. 3, can be binary/decimal subtraction count. 4, can be used for the timer or counter.

code
....\buffer.v
....\C8253.v
....\control.v
....\counter.v
....\logic.v
....\tb_8253.v

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