HDL for Combinational Circuits. ENEL211 Digital Technology
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1 HDL for Combinational Circuits ENEL211 Digital Technology
2 Lecture Outline Vectors Modular design Tri-state gates Dataflow modelling Behavioural Modelling
3 Vectors Often we want multi-bit quantities in digital circuits bytes, samples, codes, etc. Instead of specifying one wire for each bit we can specify the complete quantity as a vector e.g. output [0:3]D; wire [7:0]SUM;
4 Vectors The MSB of the vector is first, LSB last. Can address individual bits of a vector e.g. D[2] Can address parts of a vector e.g. SUM[5:3];
5 2 to 4 line Decoder
6 2 to 4 line Decoder Example module decoder_gl (A,B,E,D); input A,B,E; output [0:3]D; wire Anot,Bnot; not n1 (Anot,A), n2 (Bnot,B), and n4 (D[0],Anot,Bnot,E), n5 (D[1],Anot,B,E), n6 (D[2],A,Bnot,E), n7 (D[3],A,B,E); endmodule
7 Modular Design Once a module has been designed it can be used by other modules. This way a design hierarchy can be built up. Module definitions cannot be placed inside another module, they must be defined externally and then incorporated through instantiation.
8 4 bit Adder
9 Half Adder module halfadder (S,C,x,y); input x,y; output S,C; //Instantiate primitive gates xor (S,x,y); and (C,x,y); endmodule
10 Full Adder module fulladder (S,C,x,y,z); input x,y,z; output S,C; wire S1,D1,D2; //Outputs of first XOR and two AND gates //Instantiate the halfadder halfadder HA1 (S1,D1,x,y), HA2 (S,D2,S1,z); or g1(c,d2,d1); endmodule
11 4 bit Adder module _4bit_adder (S,C4,A,B,C0); input [3:0] A,B; input C0; output [3:0] S; output C4; wire C1,C2,C3; //Intermediate carries //Instantiate the fulladder fulladder FA0 (S[0],C1,A[0],B[0],C0), FA1 (S[1],C2,A[1],B[1],C1), FA2 (S[2],C3,A[2],B[2],C2), FA3 (S[3],C4,A[3],B[3],C3); endmodule
12 Tri-state gates Binary gates have two states: 0 or 1. Sometimes it is useful to have a third state: undefined In practice undefined is a high-impedance (or open circuit) state where the output has no effect on connected circuits. This is useful for allowing multiple outputs to be connected together (e.g. to a bus)
13 Tri-state Buffers
14 Multiplexor Multiplexor is a combinational circuit where an input is chosen by a select signal. Two input mux output =A if select =1 output= B if select =0 A B x s
15 Two Input Multiplexor A two-input mux is actually a three input device. s A B x A B x s x = A.s + B.s
16 Tri-state 2-Input Mux
17 Tri-state 4-Input Mux
18 Tri-state Gates in HDL High-impedance state is z Non-inverting gate is bufif1(output, input, control) bufif1(y, A, C) if C=1, Y=A else Y=z
19 Tri-state Gates bufif1(y,a,c) notif1(y,a,c) bufif0(y,a,c) notif0(y,a,c)
20 2-Input Tri-state Mux module muxtri (A,B,select,OUT); input A,B,select; output OUT; //use tri data type for output tri OUT; bufif1 (OUT,A,select); bufif0 (OUT,B,select); endmodule
21 Dataflow modelling Another level of abstraction is to model dataflow. In dataflow models, signals are continuously assigned values using the assign keyword. assign can be used with Boolean expressions. Verilog uses & (and), (or), ^ (xor) and ~ (not) Logic expressions and binary arithmetic are also possible.
22 Dataflow description of 2 to 4 line Decoder module decoder_df (A,B,E,D); input A,B,E; output [0:3] D; assign D[0] = ~A & ~B & E, D[1] = ~A & B & E, D[2] = A & ~B & E, D[3] = A & B & E; endmodule
23 Dataflow description of 4 bit Adder module binary_adder (A,B,Cin,SUM,Cout); input [3:0] A,B; input Cin; output [3:0] SUM; output Cout; assign {Cout,SUM} = A + B + Cin; endmodule
24 Dataflow description of 2-input Mux Conditional operator?:takes three operands: condition? true_expression : false_expression module mux2x1_df (A,B,select,OUT); input A,B,select; output OUT; assign OUT = select? A : B; endmodule
25 Behavioural Modelling Represents circuits at functional and algorithmic level. Use proceedural statements similar in concept to proceedural programming languages (e.g. C, Java), Behavioural modelling is mostly used to represent sequential circuits.
26 Behavioural Modelling Behavioural models place proceedural statements in a block after the always keyword. The always keyword takes a list of variables. The block of statements is executed whenever one of the variables changes. The target variables are of type reg. This type retains its value until a new value is assigned.
27 Behavioral description of 2-input mux module mux2x1_bh(a,b,select,out); input A,B,select; output OUT; reg OUT; (select or A or B) if (select == 1) OUT = A; else OUT = B; endmodule
28 Behavioral description of 4-input mux module mux4x1_bh (i0,i1,i2,i3,select,y); input i0,i1,i2,i3; input [1:0] select; output y; reg y; (i0 or i1 or i2 or i3 or select) case (select) 2'b00: y = i0; 2'b01: y = i1; 2'b10: y = i2; 2'b11: y = i3; endcase endmodule
29 HDL Summary Hardware Description Languages allow fast design and verification of digital circuits. Accurate simulation and testing requires delays and inputs to be specified. There are three different levels of abstraction for modelling circuits. Primative (gate level) Dataflow Behavioral
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