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VHDL Tutorial - Introduction to VHDL for beginners

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Compact VHDL for Synthesis

Order our complete trainingcatalog. Home Training Details. Dates Michael Schwarz. Downloads Download as Flyer. Plc2 Design. Company Name. Checkbox Rechnungsadresse The billing address is different from the listed address above.

Post Code. Checkbox In-House-Schulung Please submit an offer for an in-house training. Figuring out how the code works if you didn't write it is a painful process. The basic idea is that each module has only 2 process blocks. One for combinatorial code, and other for synchronous the registers. It is great for producing readable and maintainable code.

Special attention should be given to the booting process - once your chip is functional, you have made a huge way. Simple code is preferred, sometimes there are other ways to speed-up your code, after it is already running, for example using an higher speed chip, etc'. A working code in HDL is more precious than on other software, as hardware is so hard to debug, so reuse, and also consider using "libraries" of modules which some are free and others sold.

If a design includes several building blocks, one would probably want to create lines from the interfaces between those blocks to testing points outside the chip. You will want to save enough lines in your design to divert interesting data to be inspected with external devices. If your chip is reconfigurable this will become even more handy, as you can tailor specific tests, and reprogram the outputs for each test as you go this looks very well with leds :.

By smart protocols, I've meant that should two of your physical units connect, they should communicate with the simplest communication protocol available. So if you are sure that data comes as you want it, and goes out as your program sends it, you've reached Hardware utopia - being able to work at software level : with the simulator.

But if your data doesn't get to you, the way you want it to, and you have to figure out why Finding a bug on the lines, is hard as you have to connect to the lines with special equipment, that record the states of the lines, on different times, and you'll have to make sure your lines act according to the protocol. If you need to connect two of your physical units make the "protocol" as simple as it can , up to the point it won't be called a protocol : For example if the units share a clock, add x data lines between them, and make one unit write those and the other unit read, thus passing one "word" which has x bits between them on each clock fall, for example.

If you have FPGA's, should the original clock rate be too fast for parallel data - you can control the speed of this, according to your experiments, for example making the data stay on lines of at least 't' clock cycles etc'. I assume parallel data transfer is simpler, as you can work with at lower clock rates and get the same performances, without the need to split your words on one unit, and reassemble on the other.

Even this is probably too complex :. Regarding SPI, I2C etc' I haven't implemented any of them, I can say that I've connected legs of two FPGA's running from the same clock, don't remember the exact formation of resistors in the middle , at much higher rates, so I really can't think of a good reason to use those, as the main way to pass data between your own FPGA's, unless the FPGA's are located very far one from another, which is one reason to use a serial rather than a parallel bus.

If you do have to implement any known protocol, consider using a pre-made HDL code for this - which can be found or purchased. Almost all would apply to other FPGA vendors, or would have equivalent rules. A great deal is applicable to ASIC designs. Podcast We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now. Learn more. Asked 10 years, 11 months ago. Active 1 year, 1 month ago.

Viewed 17k times. What best practices should be observed when implementing HDL code? Burkhard JeffV JeffV 42k 31 31 gold badges 91 91 silver badges bronze badges. And in particular some issues that don't have an exact match in software: No latches Be careful with resets Check your internal and external timing Use only synthesizable code Register your outputs of all modules Be careful with blocking vs.

Brian Carlton Brian Carlton 6, 5 5 gold badges 33 33 silver badges 46 46 bronze badges. They are in no particular order My umbrella statement is to Design for validation execution. You now need to validate these combinations at any given time n : no cache read, no memory read no cache read, memory read cache read, no memory read cache read, memory read Understand and communicate assumptions.

Mealy FSMs are more likely to produce timing issues over Moore.. As for comparing against more traditional software design: discrete event driven programming is a completely different paradigm. There are 3 main approaches; Formal propagative verification FPV : You prove through logic that it will always work Directed random testing.

Randomly set delays, input values, and feature enabling as defined by a seed. This approach uses coverage points to indicate health Focus testing. This is similar to traditional software testing I was in "The Zone" :. DaveD DaveD 5 5 silver badges 3 3 bronze badges. Interestingly a lot of this advice boils down to taking account adequately of the verification effort involved in hardware design.

I don't disagree with any of your points but can't help wondering how much the industry would benefit from improving verification practices sufficiently to "un-block" the RTL design process. Imagine what would be possible if verification effort wasn't the limiting factor!

I have always found Mealy style FSMs to be easier to design and has the option to save a clock cycle. If they become part of the critical path it is always possible to register their outputs to mimic More timing. This definitely is the way to do it. These guidelines used exclusively may interfere with synthesis tools which are designed to recognize certain coding styles.

It's better to let the design spec dictate the coding arrangement.

A Design Entry Language

If the synthesis tool is "designed to recognize certain coding styles" and not "designed to recognize the language", then I'd say the tool is defective, not the coding. I think I've run in to some of the problems that Adam12 refers to though. Once a design is completed it is usually simulated for testing in a software testbench, and then synthesized , which means that it is translated into a physical design which can be implemented on an actual chip or circuit board. Both languages are used for hardware design, so there are a number of books that focus on underlying design and engineering concepts and use both VHDL and Verilog.

VHDL is one of two major hardware description languages. The other is Verilog. If you're in the market for a new web hosting provider, be sure to check out our Black Friday Deals on Web Hosting, Domains, WordPress themes and more!