revolution counter for motor

[kranthi_vlsi]

Hi

I have one module like revolution counter which will count the revolution of motor.for that module 3 I/p are there clk,reset,motor angle of 15 bit when motor angle crosses 0 degrees in positive direction the count value increments one and it crosses 0 in neg direction it decrements 1....can u suggest logic or vhdl code for dis
p.s there is no direction pin

 

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Look at the 15-bit angle value and compare it to the 0 degree value keep a record of the last received value and then you can determine if you reached 0 from the positive or negative direction and then you can increment/decrement the counter accordingly.