Verilog Programming part 18 ppsx

... 7.3 Timing Controls Various behavioral timing control constructs are available in Verilog. In Verilog, if there are no timing control statements, the simulation time does not advance. ... of a signal value or the triggering of an event. The symbol @ provided edge-sensitive control. Verilog also allows level-sensitive timing control, that is, the ability to wait for a certain ... eval...

Ngày tải lên: 01/07/2014, 21:20

... now important to discuss operator precedence. If no parentheses are used to separate parts of expressions, Verilog enforces the following precedence. Operators listed in Table 6-4 are in order ... expression takes a value x. These operators function exactly as the corresponding operators in the C programming language. // A = 4, B = 3 // X = 4'b1010, Y = 4'b1101, Z = 4&apo...

Ngày tải lên: 01/07/2014, 21:20

... the partial derivatives, consider the derivative of (9.5.15) with respect to C.Since P(x)is a fixed polynomial, it is independent of C, hence 0=(x 2 +Bx + C) ∂Q ∂C + Q(x)+ ∂R ∂C x + ∂S ∂C (9.5 .18) which ... coeffi- cients.laguer(a,m,&roots[j],&its); for (j=2;j<=m;j++) { Sort roots by their real parts by straight in- sertion.x=roots[j]; for (i=j-1;i>=1;i ) { if (roots[i].r <= x...

Ngày tải lên: 01/07/2014, 10:20

... discussed in the further chapters. • Verilog is similar in syntax to the C programming language . Hardware designers with previous C programming experience will find Verilog easy to learn. • Lexical ... internals of the module in greater detail. A module in Verilog consists of distinct parts, as shown in Figure 4-1 . Figure 4-1. Components of a Verilog Module A module de...

Ngày tải lên: 01/07/2014, 21:20

... connections. However, a warning is typically issued that the widths do not match. Unconnected ports Verilog allows ports to remain unconnected. For example, certain output ports might be simply for ... There are rules governing port connections when modules are instantiated within other modules. The Verilog simulator complains if any port connection rules are violated. These rules ar...

Ngày tải lên: 01/07/2014, 21:20

... primitives are provided in Verilog. buf not The symbols for these logic gates are shown in Figure 5-2 . Figure 5-2. Buf and Not Gates These gates are instantiated in Verilog as shown Example ... Adder This logic diagram for the 1-bit full adder is converted to a Verilog description, shown in Example 5-7 . Example 5-7 Verilog Description for 1-bit Full Adder // Define a 1-bi...

Ngày tải lên: 01/07/2014, 21:20

... such instances, Verilog HDL allows an array of primitive instances to be defined. [1] Example 5-4 shows an example of an array of instances. [1] Refer to the IEEE Standard Verilog Hardware ... Diagram for Multiplexer The logic diagram has a one-to-one correspondence with the Verilog description. The Verilog description for the multiplexer is shown in Example 5-5 . Two interm...

Ngày tải lên: 01/07/2014, 21:20

... Team LiB ] 1.5 Popularity of Verilog HDL Verilog HDL has evolved as a standard hardware description language. Verilog HDL offers many useful features • Verilog HDL is a general-purpose ... easy to use. It is similar in syntax to the C programming language. Designers with C programming experience will find it easy to learn Verilog HDL. • Verilog HDL allows different lev...

Ngày tải lên: 01/07/2014, 21:20

... now relate these hierarchical modeling concepts to Verilog. Verilog provides the concept of a module. A module is the basic building block in Verilog. A module can be an element or a collection ... checking, and coverage. However, these languages do not replace Verilog HDL. They simply boost the productivity of the verification p rocess. Verilog HDL is still needed to describe the...

Ngày tải lên: 01/07/2014, 21:20

... reset); // Instantiate D_FF. Call it dff0. not n1(d, q); // not gate is a Verilog primitive. Explained later. endmodule In Verilog, it is illegal to nest modules. One module definition cannot ... module provides a template from which you can create actual objects. When a module is invoked, Verilog creates a unique object from the template. Each object has its own name, variables,...

Ngày tải lên: 01/07/2014, 21:20