Description: 7topic http://www.edacn.net/cgi-bin/forums.cgi forum = = 9127, under R3 R0 to the output signal will be one to one, but we are unable to confirm which a key is pressed, we must proceed from R3 to R0 the output signal C0 to C3 with the scanning signal jointly decided that button is pressed. the idea of the preparation of VHDL : external interfaces include : a. INPUT feet : CLK, R3 ~ R0. b. feet OUTPUT : C0 to C3, DATA3 ~ DATA0 (identify the key values ).
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