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Please use ide. Some net data types are wire, tri, wor, trior, wand, triand, tri0, tri1, supply0, supply1 and trireg.

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A net data type must be used when a signal is: driven by the output of some device. Registers — The register variables are used in procedural blocks which store values from one assignment to the next. An assignment statement in a procedure acts as a trigger that changes the value of the data storage element. Some register data types are: reg, integer, time and real. Notes — The reg variables are initialised to x at the start of the simulation.


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The output value DO before retain time is supposed to be a certain value, for simulating what has happened in the reality, but is now unknown. Not only do errors occur when one attempts to access the output value at the retain time, but the simulation results are also mismatched with real results.

When it comes to high-end, tight timing constraint designs, retain time models becomes more critical. There is another way, though, to solve this problem. That is to specify retain time and access time in fixed values in a Verilog HDL simulation model. Since specifying in fixed values does not consist of back-annotation syntax, retain and access times of the IP cannot be revised under different working conditions.

Designers must manually tune retain and access time. This is not only a time-consuming task, but also goes against the concept of reusing. Accordingly, a computer program product for making a machine simulating the behavior of retain and access time of an output bus is provided. After the retain time, the simulator sets off a variable off in a blocking way, so that the access time model is disabled. The simulator also assigns the related output bus as unknown in a blocking way, assigns the related output bus the value stored in the register in a non-blocking way, and sets a variable on in a non-blocking way, so that the access time model is enabled.

The invention will become more fully understood from the detailed description, given herein below, and the accompanying drawings.

Verilog HDL Basics

The drawings and description are provided for purposes of illustration only, and, thus, are not intended to be limiting of the present invention. In a specific block of a Verilog HDL as known as verilog simulation model, a variable is allocated to control whether the access time delay model is enabled or not. For example, if flag! The body of function block starts with step 32 , and finishes with step After detecting every rising edge as known as positive edge of input pin clk, in step 30 , the Verilog simulator executes the instructions in the function block. The function block shown above can be treated as two parts, separated by step 38 , and a detailed description is provided in the following.

Verilog HDL: A Brief History

Immediately after the rising edge of clk, the Verilog simulator sets the variable flag to be 0 in a non-blocking way, in step 34 , so that the condition if flag! Setting a variable in a non-blocking way is similar to assigning a value to an input of a D flip-flop. The output value is as same as assigned until the D flip-flop is triggered.

In the short term, the operation of a D flip-flop is similar to a buffer. After being triggered, the input value is passed to that output. On the contrary, setting a variable in a blocking way is similar to directly assigning a value to the output of a D flip-flop and the output changes immediately to be the same as assigned.

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We will mention blocking again later. The Verilog simulator then pauses, until the end of retain time TOH. The pause is referred to step The 2 nd part of the function block now begins. Codementor and its third-party tools use cookies to gather statistics and offer you personalized content and experience.

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Verilog HDL Basics

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