EE 459/500 HDL Based Digital Design with Programmable Logic. Lecture 14 Electronic Dice Game: From ASM Chart to - PDF

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EE 459/500 HDL Based Digital Design with Programmable Logic Lecture 14 Electronic Dice Game: From ASM Chart to Microprogrammed Control References: Chapter s 5 from textbook Overview Dice Game Description
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EE 459/500 HDL Based Digital Design with Programmable Logic Lecture 14 Electronic Dice Game: From ASM Chart to Microprogrammed Control References: Chapter s 5 from textbook Overview Dice Game Description ASM chart Controller Implementation 1: Behavioral Controller Implementation 2: Equations Microprogrammed Control Two address microcode 2 1 Electronic Dice Game: there are two dice to roll Rules of the game: After the first roll of the dice, the player (P) wins if the sum is 7 or 11. P loses if the sum is 2, 3, or 12. Otherwise, the sum P obtained on the first roll is referred to as a point, and P must roll again. On the second or subsequent roll of the dice, P wins if the sum equals the point, and loses if the sum is 7. Otherwise, P must roll again until finally wins or loses. 3 Electronic Dice Game: Flow Chart Reset: to initiate a new game Rb (Roll button): If Rb is pushed, dice counters count at a high speed When released, the values in the two counters are displayed, and the game proceeds Store sum 2 ASM Chart Inputs to Control Unit: Reset Rb D7 ( 1 if sum of dice is 7) D711 ( 1 if sum is 7 or 11) D2312 Eq (sum = Point) Outputs of Control Unit: Roll Sp (Sum to be stored) Win Lose Overview Dice Game Description ASM chart Controller Implementation 1: Behavioral Controller Implementation 2: Equations Microprogrammed Control Two address microcode 3 State Graph of Control Unit (Mealy or Moore?) Control Unit: Behavioral VHDL Code (1/2) library BITLIB; use BITLIB.bit_pack.all; entity DiceGame is port ( Rb, Reset, CLK: in bit; Sum: in integer range 2 to 12; Roll, Win, Lose: out bit); end DiceGame; architecture DiceBehave of DiceGame is signal State, Nextstate: integer range 0 to 5; signal Point: integer range 2 to 12; signal Sp: bit; begin process(rb, Reset, Sum, State) begin Sp = '0'; Roll = '0'; Win = '0'; Lose = '0'; case State is when 0 = if Rb = '1' then Nextstate = 1; end if; when 1 = if Rb = '1' then Roll = '1'; elsif Sum = 7 or Sum = 11 then Nextstate = 2; elsif Sum = 2 or Sum = 3 or Sum =12 then Nextstate = 3; else Sp = '1'; Nextstate = 4; end if; 4 Control Unit: Behavioral VHDL Code (2/2) when 2 = Win = '1'; if Reset = '1' then Nextstate = 0; end if; when 3 = Lose = '1'; if Reset = '1' then Nextstate = 0; end if; when 4 = if Rb = '1' then Nextstate = 5; end if; when 5 = if Rb = '1' then Roll = '1'; elsif Sum = Point then Nextstate = 2; elsif Sum = 7 then Nextstate = 3; else Nextstate = 4; end if; end case; end process; process(clk) begin if rising_edge(clk) then State = Nextstate; if Sp = '1' then Point = Sum; end if; end if; end process; end DiceBehave; Overview Dice Game Description ASM chart Controller Implementation 1: Behavioral Controller Implementation 2: Equations Microprogrammed Control Two address microcode 5 Control Unit: Just a Sequential Circuit Typical block diagram of sequential circuit Need three Flip- Flops for State register Construct State Transition Table and then use K-maps to derive equations for: A+, B+, C+, Win, Lose, Roll, Sp State Transition Table Derived from the ASM chart A row for each link path in the ASM chart 6 Control Unit: VHDL Code Overview Dice Game Description ASM chart Controller Implementation 1: Behavioral Controller Implementation 2: Equations Complete game Microprogrammed Control Two address microcode 7 Counters + Adder of Datapath: VHDL Code Complete Dice Game: VHDL Code 8 Overview Dice Game Description ASM chart Controller Implementation 1: Behavioral Controller Implementation 2: Equations Complete game Microprogrammed Control Two address microcode Hardware arrangement for microprogramming CAR SEL DATAPATH 9 ASM chart with Moore outputs and one qualifier per state ASM chart modifications: All output converted to Moore outputs Only one input variable must be tested in each state Two-address microprogram for Dice Game 10 Final hardware arrangement DATAPATH? CAR ROM 11 x 15 DATAPATH SEL NSF NST SEL 3 Summary Electronic Dice Game Multiple ways to design the control unit Microprogrammed control is a more structured approach for complex systems 22 11
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