Histogram

Design a hardware module that computes a histogram with 16 bins for a stream of 4-bit values. Count the occurrences of each value (0-15) and output the final counts for all 16 bins.

Example: For stream [0, 1, 0, 2, 1, 0, 15], the output should be [3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1].