Có 15+ tài liệu thuộc chủ đề "Sequential Verulog Topics"
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12.3 Sequential UDPs. Sequential UDPs differ from combinational UDPs in their definition and behavior.. Sequential UDPs have the following differences:. The output of a sequential UDP is always declared as a reg.. An initial statement can be used to initialize output of sequential UDPs.. If a sequential UDP is sensitive to input levels, it is called a level-sensitive. sequential UDP....
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12.4 UDP Table Shorthand Symbols. Shorthand symbols for levels and edge transitions are provided so UDP tables can be written in a concise manner. UDP Table Shorthand Symbols Shorthand. Can be specified only in output field of a sequential UDP. When designing a functional block, it is important to decide whether to model it as a module or as a...
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13.3 Internal Data Representation. PLI library routines are discussed later in the chapter.. The Verilog description of the circuit is shown in Example 13-1.. 13.4 PLI Library Routines. PLI library routines provide a standard interface to the internal data representation of the design. The user-defined C routines for user-defined system tasks are written by using PLI library routines. In the...
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PLI Interface provides a set of C interface routines to read, write, and extract information about the internal data structures of the design. Access routines can read and write information about a particular object from/to the design. VPI routines provide a superset of the functionality of acc_ and tf_ routines. Hierarchical module instance name is the input to the task...
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14.3 Verilog HDL Synthesis. Logic synthesis tools take the register transfer-level HDL description and convert it to an optimized gate-level netlist. In this chapter, we discuss RTL-based logic synthesis with Verilog HDL. Behavioral synthesis tools that convert a. 14.3.1 Verilog Constructs. Not all constructs can be used when writing a description for a logic synthesis tool.. In general, any construct...
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10.1 Types of Delay Models. There are three types of delay models used in Verilog: distributed, lumped, and pin-to-pin (path) delays.. 10.1.1 Distributed Delay. Distributed delays are specified on a per element basis. Delay values are assigned to individual elements in the circuit. An example of distributed delays in module M is shown in Figure 10-1.. Figure 10-1. When inputs...
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10.3 Timing Checks. In the earlier sections of this chapter, we discussed how to specify path delays. The purpose of specifying path delays is to simulate the timing of the actual digital circuit with greater accuracy than gate delays. System tasks are provided to do timing checks in Verilog. All timing checks must be inside the specify blocks only. 10.3.1...
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11.1 Switch-Modeling Elements. [1] Array of instances can be defined for switches. 11.1.1 MOS Switches. Two types of MOS switches can be defined with the keywords nmos and pmos.. The symbols for nmos and pmos switches are shown in Figure 11-1.. Figure 11-1. NMOS and PMOS Switches. In Verilog, nmos and pmos switches are instantiated as shown in Example 11-1.....
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11.2 Examples. 11.2.1 CMOS Nor Gate. Though Verilog has a nor gate primitive, let us design our own nor gate,using CMOS switches. The gate and the switch-level circuit diagram for the nor gate are shown in Figure 11-4.. Figure 11-4. Gate and Switch Diagram for Nor Gate. Using the switch primitives discussed in Section 11.1, Switch-Modeling Elements, the Verilog description...
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5: Instantiate switches with the following delay specifications. 12.1 UDP basics. In this section, we describe parts of a UDP definition and rules for UDPs.. 12.1.1 Parts of UDP Definition. Figure 12-1 shows the distinct parts of a basic UDP definition in pseudo syntax form. Figure 12-1 Parts of UDP Definition //UDP name and terminal list. <output_terminal_name>(only one allowed). output...
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14.5 Verification of Gate-Level Netlist. The optimized gate-level netlist produced by the logic synthesis tool must be verified for functionality. Also, the synthesis tool may not always be able to meet both timing and area requirements if they are too stringent. Thus, a separate timing verification can be done on the gate-level netlist.. 14.5.1 Functional Verification. Identical stimulus is run...
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14.7 Example of Sequential Circuit Synthesis. In Section 14.4.2, An Example of RTL-to-Gates, we synthesized a combinational circuit. Specifically, we will design finite state machines.. 14.7.1 Design Specification. A simple digital circuit is to be designed for the coin acceptor of an electronic newspaper vending machine.. This digital circuit can be designed by using the finite state machine approach.. 14.7.2...
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Apply identical stimulus to the RTL and the gate-level netlist and compare the output.. A 3-bit input a[2:0] is provided to the decoder. The output of the decoder is out[7:0].. Apply identical stimulus to the RTL and the gate-level netlist and compare the outputs.. 15.1 Traditional Verification Flow. illustrated in Figure 15-1. This flow addresses only the verification perspective. Figure...
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15.2 Assertion Checking. The traditional verification flow discussed in the previous section is a black box approach, i.e., verification relies only on the knowledge of the input and output behavior of the system.. Many other verification methodologies have evolved over the past few years to complement the traditional verification flow discussed in the previous section. In this section and the...
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Having understood how basic Verilog constructs are interpreted by the logic synthesis tool, let us now discuss the synthesis design flow from an RTL description to an optimized gate-level description.. 14.4.1 RTL to Gates. To fully utilize the benefits of logic synthesis, the designer must first understand the flow from the high-level RTL description to a gate-level netlist. Logic Synthesis...