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The four seven segment (+ decimal point) at the BASYS kit must be used in a multiplexed manner where only one display ligth up during the cycle. (Read more in the BASYS documentation)

The first step in order to create a multiplexed display driver will be the Bcd to 7-segment driver (actually a Hex to 7-segment driver)

1a)  Fill out the Truth table below
1b)
Choose a strategy for the solution like:
>> Implement the min. term. equations for each segment
>> Reduce the Boolean with Carnaugh charts
>> Consider using a 1 out 16 Decoder + some logic
>> VHDL could be a solution ... but maybe its a bit early for this
1c)  Implement the solution and test it on the board.

The solution can be downloaded and tested with this file if you like: Test_bcd27segm_ver1.bit

 Segments Bcd(3:0) a b c d e f g 0000 0 0 0 0 0 0 1 0001 1 0 0 1 1 1 1 0010 0 0 1 0 0 1 0 0011 0 0 0 0 1 1 0 0100 1 0 0 1 1 0 0 0101 0 1 0 0 1 0 0 0110 0 1 0 0 0 0 0 0111 0 0 0 1 1 1 1 1000 0 0 0 0 0 0 0 1001 0 0 0 0 1 0 0 1010 0 0 0 1 0 0 0 1011 1 1 0 0 0 0 0 1100 0 1 1 0 0 0 1 1101 1 0 0 0 0 1 0 1110 0 1 1 0 0 0 0 1111 0 1 1 1 0 0 0

Truth table for the bcd27segm version 1