Code Converters Section 3-4 Mano & Kime
Code Converters BCD-to Excess-3 Code Converter Hex-to-Seven-Segment Decoder Lab 3 – ALU2 Arithmetic and Logic Instructions 7-Segment Decoder
BCD-to Excess-3 Code Converter
Maps for BCD-to-Excess-3 Code Converter
Logic Diagram of BCD-to-Excess-3 Code Converter
Excess3 inp(3:0) outp(3:0)
Note: inp(3:0) = [A, B, C, D] outp(3:0) = [W, X, Y, Z]
Code Converters BCD-to Excess-3 Code Converter Hex-to-Seven-Segment Decoder Lab 3 – ALU2 Arithmetic and Logic Instructions 7-Segment Decoder
Hex-to-Seven-Segment Decoder
Turning on an LED
7-Segment Display
7-Segment Display a b c d e f g 0 1 1 1 1 1 1 0 1 0 1 1 0 0 0 0 0 1 1 1 1 1 1 0 1 0 1 1 0 0 0 0 2 1 1 0 1 1 0 1 3 1 1 1 1 0 0 1 4 0 1 1 0 0 1 1 5 1 0 1 1 0 1 1 6 1 0 1 1 1 1 1 7 1 1 1 0 0 0 0
7-Segment Display a b c d e f g 8 1 1 1 1 1 1 1 9 1 1 1 1 0 1 1 8 1 1 1 1 1 1 1 9 1 1 1 1 0 1 1 A 1 1 1 0 1 1 1 b 0 0 1 1 1 1 1 C 1 0 0 1 1 1 0 d 0 1 1 1 1 0 1 E 1 0 0 1 1 1 1 F 1 0 0 0 1 1 1
Hex-to-Seven-Segment Decoder
a b c d e f g Note: a – g LOW to turn ON
Code Converters BCD-to Excess-3 Code Converter Hex-to-Seven-Segment Decoder Lab 3 – ALU2 Arithmetic and Logic Instructions 7-Segment Decoder
ALU2 – Arithmetic and Logic Instructions sel y Instruction name “000” a + b + “001” b - a - “010” a and b AND “011” a or b OR “100” a xor b XOR “101” true if a = 0 false otherwise 0= “110” true if a < 0 0< “111” true if b > a (unsigned) U> true = all 1’s false = all 0’s
Digilab2 – DIO1 Boards Four 7-segment displays dig1 dig2 dig3 dig4
Digilab2 Board – Common Anodes Pins A1 A2 A3 A4 Pins AtoG(6 downto 0)
Digilab XLA LEDs 7-segment displays pushbuttons switches
Digilab Board dig4 dig3 dig2 dig1
Digilab XLA Board – Common Anodes Pins A4 A3 A2 A1 Pins CA CB CC CD CE CF CG
Top-level Design – Lab 3 Display y on dig4 ldg Lab3 a(3:0) ALU2 sel(2:0) y SW(5:8) A(1:4) BTN(1:3) ldg ‘1’ SW(1:4) b(3:0) AtoG(6:0) seg7dec q AtoG “0001” LD(1:8) y1 Display y on dig4