Register Transfer Level in Verilog: Part I
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1 Source: M. Morris Mano and Michael D. Ciletti, Digital Design, 4rd Edition, 2007, Prentice Hall. Register Transfer Level in Verilog: Part I Lan-Da Van ( 范倫達 ), Ph. D. Department of Computer Science National Chiao Tung University Taiwan, R.O.C. Fall, 2014 ldvan@cs.nctu.edu.tw
2 Introduction A digital system is a sequential logic system constructed with flip-flops and gates. To specify a large digital system with a state table is very difficult. Modular subsystems Registers, decoders, multiplexers, arithmetic elements and control logic. They are interconnected with datapaths and control signals. A digital system is represented at the register transfer level (RTL) when it is specified by the following three components: The set of registers in the system. The operations that are performed on the data stored in the registers. The control that supervises the sequence of operations in the system. 2
3 Statement R2 R1 denotes a transfer of the contents of register R1 into register R2. A conditional statement governing a register transfer operation is symbolized with an if-then statement such as If (T1 =1) then (R2 R1) where T1 is a control signal generated in the control section. R1 R1 + R2 Add contents of R2 to R1 R3 R3 + 1 Increment R3 by 1 R4 shr R4 Shift right R4 R5 0 Clear R5 to 0 3
4 Type of Operations Most Often Encountered in Digital System Digital Circuit Lab Transfer operations, which transfer data from one register to anther. Arithmetic operations, which perform arithmetic on data in registers. Logic operations, which perform bit manipulation of nonnumeric data in registers. Shift operations, which shift data between registers. 4
5 Register Transfer Level in HDL In Verilog, descriptions of RTL operations use a combination of behavioral and dataflow constructs and are employed to specify register operations procedural assignment statements within an edge-sensitive cycle behavior combinational logic functions continuous assignment statement or by procedural assignment statements within a level-sensitive cycle behavior 5
6 Register Transfer Level in HDL The following examples show the various ways to specify a register transfer operation in Verilog: (a) assign S = A + B; //continuous assignment for addition operation (b) (A, B) //level-sensitive cyclic behavior S = A + B; //combinational logic for addition operation (c) (negedge clock) //edge-sensitive cyclic behavior begin RA < = RA + RB; //nonblocking procedural assignment for addition RD < = RA; //register transfer operation end The target operand in a continuous assignment statement (assign S = A + B) cannot be a register data type, but must be a type of net, for example, wire. There are two kinds of procedural assignments: blocking and nonbolcking. 6
7 HDL Operators 7
8 HDL Operators
9 HDL Operators The exponentiation operator (**) was added to the language in 2001 and forms a doubleprecision floating-point value from a base and exponent having a real, integer, or signed value. Two types of logic operators for binary words: bitwise a bit-by-bit operation on two vector operands to from a vector result. reduction acting on a single operand and producing a scalar (one-bit) result. the reduction NOR (~ ) results in 0 with operand and and in 1 with operand Negation: bitwise only. 9
10 HDL Operators The logical and relational operators are used to form Boolean expressions and can take variables or expressions as operands. An operand that is variable evaluates to 0 if the value of the variable is equal to zero and to 1 if the value is not equal to zero. 10
11 HDL Operators For example, if A =1010, B =0000, then A has the Boolean value 1, B has Boolean value 0. Results of other operation with these value: A && B = 0 A B = 1 // logical AND // logical OR!A = 0 // logical complement!b = 1 // logical complement (A > B) = 1 // is greater than (A == B) = 0 // identity (equality) 11
12 HDL Operators 12
13 repeat loop Loop Statements forever loop initial initial begin begin clock =1'b0; clock =1'b0; repeat (16) forever #5 clock =~clock; #10 clock =~clock; end end while loop for loop integer count; for (j =0; j < 8; j = j + 1) initial begin begin //procedural statement go here count =0; end while (count < 64) #5 count = count + 1; end 13
14 Loop Statements Although it is possible to use a reg variable to index a loop, sometimes it is more convenient to declare an integer variable, rather than a reg, for counting purposes. Variables declared as data type reg are stored as unsigned numbers. Those declared as data type integer are stored as signed numbers in 2 scomplement format. The default width of an integer is a minimum of 32 bits. 14
15 Loop Statements HDL Example 8.1 // Description of 2 4 decoder using a for loop statement module decoder (IN, Y); input [1: 0] IN; // Two binary inputs output [3: 0] Y; // Four binary outputs reg [3: 0] Y; integer k; // Control (index) variable for loop (IN) for (k = 0; k <= 3; k = k + 1) if (IN == k) Y[k] = 1; else Y[k] = 0; endmodule if (IN == 00) Y[0] = 1; else Y[k] = 0; if (IN == 01) Y[1] = 1; else Y[k] = 0; if (IN == 10) Y[2] = 1; else Y[k] = 0; if (IN == 11) Y[3] = 1; else Y[k] = 0; 15
16 Logic Synthesis Logic synthesis is the automatic process by which a computer-based program (i.e., a synthesis tool) transforms an HDL model of a logic circuit into an optimized netlist of gates... The types of ICs that implement the design may be: an application-specific integrated circuit (ASIC), a programmable logic device (PLD), a field-programmable gate array (FPGA). Logic synthesis is widely used in industry to design and implement large circuits efficiently, correctly, and rapidly. 16
17 Logic Synthesis The continuous assignment (assign) statement is used to describe combinational circuits. (+) a binary adder with full-adder circuits. ( ) a gate-level subtractor consisting of full adders and exclusive-or gates (Fig. 4.13). A statement with a conditional operator such as assign Y = S? In_1 : In_0; translates into a two-to-one-line multiplexer with control input S and data input In_1 and In_0. 17
18 Logic Synthesis A cyclic behavior (always...) may imply a combinational or sequential circuit, depending on whether the event control expression is level sensitive or edge sensitive. For example, (In_1 or In_0 or S) if (S) Y = In _ 1; else Y = In _ 0; translates into a two-to-one-line multiplexer. An edge-sensitive cyclic behavior (e.g., (posedge clock)) specifies a synchronous (clocked) sequential circuit. Examples of such circuits are registers and counters. 18
19 Logic Synthesis A sequential circuit description with a case statement translates into a control circuit with D flip-flops and gates that form the inputs to the flip-flops. each statement a gate/flip-flop circuit For synthesizable sequential circuits, the event control expression must be sensitive to the positive or negative edge of the clock (synchronizing signal), but not to both. 19
20 Fig. 8.1 A simplified flowchart for HDLbased modeling, verification, and synthesis 20
21 Algorithmic State Machines (ASMs) Digital Circuit Lab The logic design of digital system can be divided into two distinct parts. One is concerned with the design of the digital circuits that perform the data-processing operations. The other is concerned with the design of the control circuits that determine the sequence in which the various actions are performed. 21
22 Algorithmic State Machines (ASMs) The control logic that generates the signals for sequencing the operations in the data path unit is a finite state machine (FSM). A flowchart that has been developed specifically to define digital hardware algorithm is called an algorithmic state machine (ASM) chart. The ASM chart is composed of three basic elements: State box Decision box Conditional box They connected by directed edges indicating the sequential precedence and evolution of the states as the machine operates. 22
23 ASM Chart State Box FIGURE 8.3 ASM chart state box FIGURE 8.4 ASM chart decision box 23
24 ASM Chart Conditional Box Digital Circuit Lab 24
25 ASM block FIGURE 8.6 ASM block 25
26 Simplifications FIGURE 8.7 State diagram equivalent to the ASM chart of Fig
27 Timing Considerations The timing for all register and flip-flop in digital system is controlled by a master-clock generator. FIGURE 8.8 Transition between states 27
28 ASMD Chart Contrasted between Algorithmic State Machine and Datapath (ASMD) charts & ASM charts. An ASMD chart does not list register operations within a state box. The edges of an ASMD charts are annotated with register operations that are concurrent with the state transition indicated by the edge. An ASMD chart includes conditional boxes identifying the signals which control the register operations that annotate the edges of the chart. An ASMD chart associates register operations with state transitions rather than with state. 28
29 Three-step To Design an ASMD Chart Step 1: Form an ASM chart displaying only how the inputs to the controller determine its state transitions. Step 2: Convert the ASM chart to an ASMD chart by annotating the edges of ASM chart to indicate to the concurrent register operations of the datapath unit. Step 3: Modify the ASMD chart to identify the control signals that are generated by the controller and use the indicated register operations in the datapath unit. 29
30 Design Example Block diagram: A: a 4-bit binary counter E and F: JK flip-flops Sequence of operations: If A 2 = 0, E is cleared to 0 and the count continues. If A 2 = 1, E is set to 1; then if A 3 = 0, then the count continues, but if A 3 = 1, F is set to 1 on the next clock pulse and the system stops counting. Then, if Start = 0, the system remains in the initial state, but if Start = 1, the operation cycle repeats. 30
31 Design Example 31
32 Design Example 32
33 Design Example Datapath and controller 33
34 Design Example (state diagram) (ASMD chart) 34
35 Design Example encoding 35
36 Design Example By inspection: Sequence register & decoder (p. 390) DG0 = Start S_idle + S_1 DG1 = S_1 A2 A3 = 36
37 Design Example By inspection: (State 10 is not used) set_e = S_1 A2 clr_e = S_1 A2' set_f = S_2 = G 1 _ clr_a_f = Start S_idle = Start G 0 incr_a = S_1 37
38 logic diagram of control unit Design Example set_e = S_1 A2 clr_e = S_1 A2' set_f = S_2 = G 1 clr_a_f = Start S_idle = Start G 0 incr_a = S_1 _? S_idle S_1 S_2 38
39 HDL Description of Design Example Structural sufficient experience The lowest and most detailed level Specified in terms of physical components and their interconnection RTL Imply a certain hardware configuration Specified in terms of the registers, operations performed, and control that sequences the operations. Algorithmic-based behavioral The most abstract Most appropriate for simulating complex systems to verify design ideas and explore tradeoffs Digital Circuit Lab 39
40 RTL Description The manual method of design developed A block diagram (Fig. 8.9(a)) showing the interface between the datapath and the controller. An ASMD chart for the system. (Fig. 8.9(d)) The logic equations for the inputs to the flip-flops of the controller. A circuit that implements the controller (Fig. 8.12). In contrast, an RTL model describes (1) state transitions of the controller and (2) operations of the datapath as a step towards automatically synthesizing the circuit that implements them. 40
41 RTL Description 41
42 RTL Description (forget to make an assignment is OK) (2 bx) (one of the above three not detected) 42
43 RTL Description 43
44 RTL Description 44
45 Testing the Design Description 45
46 Testing the Design Description 46
47 Testing the Design Description (in groups) (recommended) (Table 8.3) 47
48 Structural Description HDL Example 8.4 presents the structural description of the design example. It consists of a nested hierarchy of modules and gates describing: The top-level module, Design_example_STR The modules describing the controller and the datapath The modules describing the flip-flops and counters Gates implementing the logic of controller 48
49 Structural Description The top-level module (see Fig. 8.10) encapsulates the entire design by: Instantiating the controller and the datapath modules Declaring the primary (external) input signals Declaring the output signals Declaring the control signals generated by the controller and connected to the datapath unit Declaring the status signals generated by the datapath unit and connected to the controller 49
50 HDL Example
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53 53
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