Coding style

In designing a complex parallel program, it is useful to think of any parallel computer in terms of a NUMA model in which all memory, anywhere in the system, can be accessed by any processor as needed. One can then focus independently on the questions of memory access methods (which determine coding style for an application) and memory access costs (which ultimately determine program efficiency). 

In this section, we discuss some basic issues related to HDL coding for synthesis such as VHDL types, unwanted latches, variables and signals, and priority encoding. For a certain desired functionality, it is often possible to code HDL in a number of different ways. However, there are several guidelines that one can follow to develop a consistent coding style for synthesis. 

Example 2.1 VHDL Coding Style to Avoid Buffer Data Types... 

Example 2.8 Recommended Coding Style for State Machines... 

Example 2.10 shows the same state machine described in Example 2.7 using both the state vector attribute and the enum encodlng attribute. enum encoding has been used such that the first flip-flop, when on, implies the state SO, the second flip-flop implies state SI, and so on. Note that the coding style uses the state vector attribute as in Example 2.8 and does not require the declaration of state vectors. In general, the one-hot encoding style involves e use of one flip-flop for each state, the current state being determined by the flip-flop which is on. 

HDL Coding Styles Sequential Devices Application Note... 

Max Area cost has the least priority in cost calculation. By default, the tool does not optimize for area once the timing constraints are met. In other words, if explicit area constraints are specified, DC performs area optimization. Since synthesis results are dependent to a large extent on a number of factors such as constraints, libraries and coding styles, optimization of a design is an iterative process. 

Experiments with VSS show that human-quality designs can be achieved with the first three models, while design quality obtained from temporal models is very dependent on VHDL coding style. 

Listing 10.19 Code example for MATLAB numerical solution of DE for y cos(t). A comparison with present coding style is also shown. 

Wood Shingles and Shakes. Early roofs in the United States were primarily hand-spHt hickory or cypress shakes. The natural beauty and style of these materials make them popular. Fire-retardant treatment and underlays may be needed to meet local fire codes. Wood shingles are sawn cedar having a uniform thickness. Wood shakes are usually hand-spHt and resawn. 

A one-necked Ace Glass 6935 flask with style-C side well (ordering code 6935-72) was used by the... 

Fig. 1 Comparison of the experimentally determined geometries of the hydrogen-bonded complex H3N-- -HC1 and its halogen-bonded analogue H3N- C1F (both drawn to scale) with a non-bonding electron-pair (n-pair) model of NH3. Here, and in other figures, the n-pair electron distribution is drawn in the exaggerated style favoured by chemists. The key to the colour coding of atoms used in this and similar figures is also displayed...

It is important that you make your programs readable. It is guaranteed that someone other than you will have to read your program at some point, and you want to make that task easy. A well-written SAS program has an ample supply of comments, employs white space to make the code pleasing to the eye, and uses a consistent case and indention style. Lor more information about basic SAS programming style, you may want to refer to The Little SAS Book A Primer, by Lora Delwiche and Susan Slaughter. 

Note that adding these two shaded lines of code to your SAS procedure gives you an attractive RTF file. If you do not like the default ODS style template that SAS uses for your output, you can use a different style template supplied by SAS by specifying the STYLE= option in the ODS RTF statement. If you still do not like the way your RTF file looks, you can define your own ODS style template with PROC TEMPLATE. Finally, PROC REPORT allows you to define formatting elements within the SAS procedure itself, where you can customize the appearance of almost any element on the page. For more information about ODS, you can refer to the SAS Press books Output Delivery System The Basics, by Lauren Haworth, and Quick Results with the Output Delivery System, by Sunil Gupta. If you just want more style templates to choose from, you can investigate the templates created by Bernadette Johnson in Instant ODS Style Templates for the SAS Output Delivery System. 

Solid board materials may be converted into collapsible or rigid cartons or rigid fiberboard (outers). International codes exist for solid and corrugated fi-berboards in terms of design (style). These cases are specified by style, internal dimensions, board grade, and quality. 

Example V-4 is also from "The Elements of Programming Style". It is a piece of PL/I code which runs through a list of numbers determining whether or not they are prime it tacitly assumes that the input is integer (which might have been checked elsewhere). 

Types that define the behavior expected at the interfaces to classes. Classes implement types. In some design styles, all parameters and variables are declared with types classes are referred to in the code only to instantiate new objects, and even that is encapsulated within factory objects. 

In a joint action, some of the parameters may be distinguished as participants and drawn linked to the use case pictorially, whereas other parameters are written in text style. For example, in Figure 4.5, buyer and vendor are participants, whereas item is a parameter. In business analysis, the difference is a matter of convenience and is analogous to the equivalence of the associations and attributes of object types. In a software design, the participants can be used to represent objects that we know will definitely exist in the final code and that will, between them, take responsibility for executing the action. The list of parameters, on the other hand, represents information transferred between them whose implementation is yet to be determined. 

In other words, I have been provided with a function that retrieves or abstracts from the implementation s terms to the spec s. (And, of course, it is read-only It would be confusing if it changed anything.) Now I can see that the put code indeed increases the length, as I required. If working that out by only inspecting the code is not my style, I can ask that the designer include my pre- and postconditions as assertions in the code so that we can test it properly. 

When you write a requirements specification (in any style and language you like), you want it to be a true statement about the product that ends up being delivered. If QA shows that the product falls short of the spec, you fix the code or if it turns out to be impractical to deliver what was first specified, you can change the specification. But one way or another, you can t (or shouldn t ) call the job complete until the delivered design matches the specified requirements. 

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