163 4-bit up/down binary counter

direction | pin name     | function  
----------+--------------+-------------------
in        | clk          | clk
in        | rst_n        | rst_n
in        | ui_in[0]     | test      (test mode)
in        | ui_in[1]     | ud        (up/down)
in        | ui_in[2]     | en        (enable)
out       | ui_out[3:0]  | cnt[3:0]  (count)

Connect input pin EN to VDD
Connect input pin TEST to GND
Connect input pin UD to VDD or GND through a switch
Connect input pin RST_N to an R-C startup circuit
Connect input pin CLK to a 50 MHz square waveform
Connect the output pins CNT[3:0] to 4 LEDs