Serdes design vhdl tutorial pdf

Figure 22 shows a vhdl description of the interface to this entity. These blocks convert data between serial data and parallel interfaces in each direction. Serializerdeserializer component design and test mcgill. Design guidelines for implementing lvds interfaces. Ashenden vhdl examples 1 vhdl examples for synthesis by dr. Depending on the design, a variety of bist patterns can be generated to not only facilitate the debugging and testing of the serdes design but also to enhance the overall systemlevel diagnostic capability. For this tutorial it is assumed that you already have basic knowledge of the vhdl language and know how to use simulation tools we will use the xilinxs vivado built in simulator, but you can easily adapt the tutorial to other tools you may be familiar with.

Quickly implement jesd204b on a xilinx fpga analog devices. Learning digital systems design in vhdl by example in a. Entity the basic design element in vhdl is called an entity. Hdls in the design process, vhdl entities, architectures, and processes, vhdl names, signals, and attributes, vhdl operators, vhdl constructs, vhdl hierarchical modeling, vhdl modeling guidelines, parameterized ram modeling, test benches, vhdl fsm modeling, vhdl sequential logic modeling and verilog. Department of electrical and computer engineering university. Once the parallel data is latched in, the 10to1 multiplexer in the serializer converts the 10bit parallel data into a serial data stream. Language structure vhdl is a hardware description language hdl that contains the features of conventional programming languages such as pascal or c. Chapter 1, using foundation express with vhdl, discusses general concepts about vhdl and the foundation express design process and methodology. A serializerdeserializer serdes pronounced sirdeez or sirdez is a pair of functional blocks commonly used in high speed communications to compensate for limited inputoutput. Lvds serdes intel fpga ip user guide intel arria 10 and intel cyclone 10 gx devices updated for intel quartus prime design suite. This note introduces the student to the design of digital logic circuits, both combinational and sequential, and the design of digital systems in a hierarchical, topdown manner. Xilinx 7 series fpgas contain iserdes and oserdes primitives that make the design of serializer and deserializer circuits very straightforward and allows higher operation at speeds from 415 mbs to 1,200 mbs per line, when usin g perbit deskew, depending on the family and speed grade used.

Examine and characterize cdr circuits outline introduction and basics of clock and data recovery circuits clock recovery architectures and issues. Jul 02, 2014 sign in to like videos, comment, and subscribe. It describes just the outside view of a hardware module. For a stepbystep guide on creating a quartus ii project, refer to the tutorial in the. Learn more at microsemi proprietary and confidential ug0567 user guide revision 6. Highspeed serial io can be used to solve system interconnect design challenges. Learn how a design is implemented in the configurable logic blocks of an fpga. Lecture 200 clock and data recovery circuits references 6 objective the objective of this presentation is. Vhdl lecture 2 understanding entity, bit, std logic and data modes. This can be a tricky task if your fpga design is using alot of les. Read all of this document before you come to the first session of the lab. Jesd204 is a highspeed serial interface for connecting data converters adcs and dacs to logic devices. You may have to massage the design after the fitter is done. The ds92lv16 is designed mainly for pointtopoint applications, but you may.

The logicore ip selectio interface wizard simplifies the integration of selectio technology into system designs for supported devices. Learning digital systems design in vhdl by example in a junior course darrin m. Examples of designs using serdes ratios of 10, 12, 14, and. Vhdl tutorial pdf 84p currently this section contains no detailed description for the page, will update this page soon. They are expressed using the sy ntax of vhdl 93 and subsequent versions. Lvds serdes transmitter receiver ip cores user guide updated for intel quartus prime design suite. This site showns examples in verilog, but vhdl could have been used, as they are equivalent for most purposes. The course starts at a very basic level for absolute beginners in vhdl, but does assume some knowledge of digital electronics such as gates, truth tables, registers, etc.

Such ios, when integrated into a highly programmable digital environment such as an fpga, allow you to create highperformance designs that were never possible before. The lvds serdes ip core configures the serializerdeserializer serdes and dynamic. The most commonly used hdl languages are verilog and vhdl. The jitter performance metrics such as jitter generation, jitter transfer, and jitter tolerance are related to digital cdr parameters and design guidelines will be provided. Using vhdl terminology, we call the module reg4 a design entity, and the inputs and outputs are ports. The ip core also supports lvds channel placements, legality checks, and lvds channelrelated rule checks. Ug0567 user guide rtg4 fpga highspeed serial interfaces. This tutorial elucidates the design challenges and tradeoffs involved in the design of cdrs. Analog design in contrast is often a very manual process almost all tasks during. Design flow for implementing lvds interfaces in cyclone series devices. Lvds serdes transmitter receiver ip cores user guide. They are expressed using the sy ntax of vhdl93 and subsequent versions. The lvds serdes ip core configures the serializerdeserializer serdes and dynamic phase alignment dpa blocks. A good general guideline is to assume that if the designer cannot readily determine what logic circuit is described by the vhdl code, then the cad tools are not.

Xilinx vhdl pdf 84p currently this section contains no detailed description for the page, will update this page soon. Before we do this, rightclick on the generate programming file. Hdl migration and fpga debug the main difficulty in fpga prototyping is the short development cycle for complete soc testing. It is a primer for you to be able to excel at vhdl. Base specification and design guide for serdes highspeed. The pipe pcs is written in verilog hdl, in order to be used in an fpga or. The custom rules section contains additional rules. There are some aspects of syntax that are incompatible with the original vhdl 87 version. Design of pllbased clock and data recovery circuits for highspeed serdes links by ishita bisht thesis submitted in partial ful llment of the requirements for the degree of bachelor of science in electrical and computer engineering in the college of engineering of the university of illinois at urbanachampaign, 2014 urbana, illinois adviser. Download the reference design files for this application note from the xilinx website. Chang from korea 2 vhdl examples and microprocessor models from uk 3 lots of examples pdf doc both on vhdl and verilog from. Thus, using two iserdes effectively reduces design cost. There are some aspects of syntax that are incompatible with the original vhdl87 version. February 27, 2010 215 e main suite d pullman, wa 99163 509 334 6306 voice and fax doc.

The developed design flow was used for the implementation of the serdes ar. For cost reasons, im using an fpga without serial io, so im looking at using one of the following ti parts. Cyclone doesnt have any fast serdes silicon so i was forced to do this with regular fpga resources. This language was first introduced in 1981 for the department of defense dod under the vhsic program.

This tutorial illustrates completing the exercise using explicit screen shots for each step, easy for anyone to follow to learn how to use the tools for design entry. An introduction to vhdl overview dinesh sharma microelectronics group, ee department iit bombay, mumbai august 2008 dinesh sharma vhdl. However, when using a singleended signaling standard, some care needs to be taken when the design requires either a serdes ratio of five or more or the phase detector mode. Standard rules custom rules standard 1 custom rules section rule set custom the standard rules section contains common rules that apply to all partners. Vhdl stands for very highspeed integrated circuit hardware description language. Serdes implementation in spartan fpgas community forums. Free vhdl books download ebooks online textbooks tutorials. Clock and data recovery cdr is a key function in all serial link applications. For detailed information about the design files, see reference design. Since fpga are becoming more accessible to the hobbyist, learning how to use them can be really useful for certain applications, like dsp and video generation. Implement the rest of your design using the design entry method of your choice. While there are a number of tools available, we have chosen xilinx for this tutorial.

Clock and data recovery circuits and their building blocks for a 1. As an example, we look at ways of describing a fourbit register, shown in figure 21. An entity represents a template for a hardware block. This will provide a feel for vhdl and a basis from which to work in later chapters. Design units in vhdl object and data types entity architecture component con. Practical introduction to pci express with fpgas michal husejko, john evans michal. If the implement design process does not return any errors, you can run the generate. Vhdl reference guide vi xilinx development system manual contents this manual covers the following topics. Hence the vhsic hardware description language vhdl was developed, and subsequently adopted as a standard by the institute of electrical and electronic engineers ieee in the us. Vhdl using foundation express with vhdl reference guide.

Each spartan6 fpga inputoutput block iob contains a 4bit input serdes and. Make sure that you havent missed to visit part 2 and part 3 of the tutorial. To begin the tutorial, you need a tool so that you can compile your program and execute the simulation. Create a custom variation of the 8b10b encoderdecoder megacore function. Build parameterizable vhdl models using the generic and generate constructs. Specifically, two data lines cannot enter the device in adjacent master and slave iobs when using cascaded serdes. Design of a high speed lvds bus interface using fpga anu s ram dept. This tutorial describes language features that are common to all versions of the language. For almost 15 years the electronic design automation industry has expanded the use of vhdl from initial concept of design documentation, to design implementation and functional verification.

Ds92lv16 16bit serdes design guide texas instruments. Hello, i like to be able to instantiate fpga primitives directly in my vhdl in ord er to get fine control of a design and to get full access to the hardware f eatures of the chip. It is a programming language used to model a digital system by dataflow, behavioral and structural style of modeling. Design of a high speed lvds bus interface using fpga. Arrange the design boundary so that the outputs in. The basic vhdl tutorial series covers the most important features of the vhdl language. Xilinx vhdl vhdl has been at the heart of electronic design productivity since initial ratification by the ieee in 1987. Bladeserver base specification serdes design 12 may 2010 ibmintel confidential 4 version 2. Firstly, it allows description of the structure of a design, that is how it is.

Pdf as synthesis becomes popular for generating fpga designs, the design style has to be adapted to fpgas for achieving optimal synthesis results. Vhdl is designed to fill a number of needs in the design process. A vhdl ebooks created from contributions of stack overflow users. The ds92lv16 is similar to the original 10bit bus lvds serdes. Jan 10, 2014 hello, i like to be able to instantiate fpga primitives directly in my vhdl in ord er to get fine control of a design and to get full access to the hardware f eatures of the chip. Apr 16, 2017 make sure that you havent missed to visit part 2 and part 3 of the tutorial. Learn vhdl using a xilinx cpld starting electronics blog. If the implement design process does not return any errors, you can run the generate programming file process. You must identify which fpga to use after you have determined the interface.

Here is a sample of the industry standards that use multigigabit serdes. Design units in vhdl object and data types part i vhdl design units 1 design units in vhdl entity architecture component con. After following this tutorial, you should be able to write vhdl codes for simple as well as moderate complexity circuits. The selectio wizard creates an vhdl verilog hdl wrapper file that instantiates and configures io logic such as input serdes, output serdes and delay blocks to customer requirements. Review the lecture notes, the supplementary lab 1 tutorial files, and the vhdl. Understand the applications of plls in clockdata recovery 2. Chapter 2, design descriptions, describes the use and impor. Tlk2501 tlk2521 tlk2701 i am having trouble choosing between them. The term serdes generically refers to interfaces used in various. The world is to a good approximation analogue the result of some measurement can theoretically take continuous values, but we store it as a discrete value, multiple of some unit.

Obtain and install the 8b10b encoderdecoder megacore function. Haskell school of engineering and computer science oakland university. When using the pll for data reception, pll deskew is required. This introductory vhdl course uses a xilinx cpld board to teach the basics of logic design using vhdl. Illustration of relationship between eye diagram, jitter pdf, and bath. This vhdl course for beginners will help you understand the fundamental principles of the language. I found some information about serdes cores but i saw that this cores are only available for virtex fpgas. The term serdes generically refers to interfaces used in various technologies and applications. Vhdl online a collection of vhdl related internet resources. This cycle includes rtl migration to fpga for complete design on board level and its debugging strategies. Two output text files are generated during the course of the simulation. Here, we focus on hdl migration and fpga debugging methodologies to. The lvds serdes ip core is available for intel arria.