nitdawg

Hi, I am new at this and bought a basys 3 dev board with 5 Pmod boards. I am trying to play around with the Pmodkypd and on digilent site they have some sample code to try (VHDL). The decoder file is attached. On line 40 it states signal sclk(19:0), what is it's purpose? I wish the example code had more comments describing its function for beginners like me. Decoder.vhd