Xilinx UG154 manual Loopback Module, Basic Loopback Operation, Example Design Configuration

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Example Design Configuration

R

connects to a SPI-4.2 PHY layer device or network processor. Figure 4-1shows the example design modules architecture and interfaces to the SPI-4.2 core.

LoopBack Module

 

SPI-4.2 Core

 

Read Module

 

 

 

 

SnkFFRdEn_n

 

RReq

Read

SnkFFAlmostEmpty_n

 

State

 

 

 

 

 

Machine

SnkFFEmpty_n

 

 

 

SnkFFValid

 

 

 

SnkFFData

Sink

 

 

Interface

 

 

 

 

 

SnkFFAddr

 

 

 

SnkFFMod

 

 

 

SnkFFSOP

 

 

 

SnkFFEOP

 

 

 

SnkFFErr

 

 

Write Module

 

 

RAck

Write

SrcFFWrEn_n

 

 

 

 

 

State

SrcFFAlmostFull_n

 

 

Machine

 

 

 

 

 

 

SrcFFData

 

 

 

SrcFFAddr

PL4

 

 

Source

 

 

SrcFFMod

 

 

Interface

 

 

 

 

Register

SrcFFSOP

 

 

Bank

 

 

SrcFFEOP

 

 

 

 

 

 

SrcFFErr

 

 

Figure 4-1:Example Design Configuration

Loopback Module

The Loopback Module connects to the user interface of the SPI-4.2 Sink and Source cores. There is a Read Module that accesses packet data from the Sink FIFO and a Write Module that transfers data into the Source FIFO. The Read Module polls the status signals SnkFFEmpty_n and SnkFFAlmostEmpty_n to determine whether it can perform a read from the Sink FIFO. The Write Module polls SrcFFAlmostFull_n to determine whether it can transfer data into the Source FIFO.

Basic Loopback Operation

When the Almost Full flag (SrcFFAlmostFull_n) is deasserted, the Write Module asserts a read request (RReq) that is sent to the Read Module. When a read request is received, the Read Module verifies that the FIFO is not empty and initiates a read from the Sink FIFO. On the next cycle, the data appears on SnkFFData, and SnkFFValid is asserted. SnkFFValid drives the SrcFFWrEn_n signal directly, which enables the writing of data into the Source FIFO. The transfer of data continues until the Source FIFO becomes almost full or the Sink FIFO becomes empty. If the Source FIFO becomes almost full, all outstanding data is written into the Source FIFO and the transfer of data between the FIFOs is halted.

SPI-4.2 v8.5 Getting Started Guide

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UG154 March 24, 2008

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Contents UG154 March 24 LogiCORE IP SPI-4.2 CoreSPI-4.2 v8.5 Getting Started Guide Date Version Revision Revision HistorySPI-4.2 v8.5 Getting Started Guide Table of Contents Appendix a Vhdl Details 1Core Customization GUI Main Window Schedule of FiguresSPI-4.2 v8.5 Getting Started Guide Table B-5sopspacing Bytes1, Err1, Addr1, EOP2, Err2, Addr2 Schedule of TablesSPI-4.2 v8.5 Getting Started Guide Contents About This GuideConventions Online Document TypographicalPreface About This Guide Convention Meaning or Use ExampleSystem Requirements IntroductionAbout the Core Recommended Design ExperienceTechnical Support Additional Core ResourcesFeedback CoreBefore you Begin Licensing the CoreLicense Options Simulation-Only EvaluationObtaining Your License FullLicensing the Core Installing Your License File Installing Your License FileLicensing the Core Quick Start Example Design OverviewGenerating the Core 1Core Customization GUI Main Window Quick Start Example DesignImplementing the Example Design Setting up for SimulationRunning the Simulation Functional SimulationTiming Simulation Running the Simulation Quick Start Example Design Project directory Detailed Example DesignDirectory and File Contents Directory and File Contents 3Doc Directory Component name/example design4Example Design Directory Name Description 5Implement Directory Name Description Component name/implementImplement/results Directory and File ContentsComponent name/simulation 6Results Directory Name Description8Functional Directory Name Description Simulation/functionalSimulation/timing Implementation and Simulation ScriptsImplementation and Simulation Scripts 9Timing Directory Name DescriptionSimulation Script Details Example Design ConfigurationExample Design Configuration Loopback ModuleBasic Loopback Operation Demonstration Test Bench Connections Demonstration Test BenchDemonstration Test Bench Clock GeneratorStartup Module 4Startup State DiagramCalendar Loader Stimulus ModuleProcedures Module Data MonitorStatus Monitor Customizing the Demonstration Test Bench Constant Default Value DescriptionTest Case Package 10Testcase Package User-Defined ConstantsTestdatafile Testcase Module Constant Default Value Description Type Range12Testcase Module Request Signals Name Function 11Useful Testcase Signals Name DescriptionCalendar Sequence Files Sink and Source Detailed Example Design Vhdl Details Procedures ModuleTable A-3sendidles PBr, cycles Inputs Name Range Description ADDR2 Appendix a Vhdl Details Verilog Details Table B-3sendidles cycles Inputs Name Range Description Appendix B Verilog DetailsTable B-7getstatus channel Inputs Range Description Random Testcase Sample CodeAppendix B Verilog Details Random Testcase Sample Code Appendix B Verilog Details Data and Status Monitor Warnings Appendix C Data and Status Monitor Warnings SETUP, HOLD, Recovery violation on /XFF Timing Simulation Warning and Error MessagesAppendix D Timing Simulation Warning and Error Messages

UG154 specifications

Xilinx UG154 is a comprehensive user guide that provides in-depth information about the architecture, features, and technologies of Xilinx's FPGA (Field Programmable Gate Array) devices. This guide is particularly vital for developers, engineers, and designers who work with Xilinx products, as it serves as a key resource throughout the development lifecycle.

One of the main features of Xilinx UG154 is its coverage of the device architecture, which details the programmable logic cells, configurable interconnects, and I/O capabilities. Xilinx FPGAs are known for their flexibility and scalability, allowing designers to implement complex digital circuits and systems that can be modified post-manufacturing, enabling rapid prototyping and iterative design processes.

Another key aspect highlighted in UG154 is the technological advancements in the latest Xilinx architectures, such as UltraScale and UltraScale+. These architectures incorporate advanced process technologies, providing improved performance and power efficiency. High-speed serial transceivers, embedded processing capabilities, and extensive memory options are also discussed, showcasing how these features enhance system integration and reduce design time.

The guide also delves into Xilinx's software ecosystem, featuring the Vivado Design Suite, which streamlines the design process through integrated design tools and a unified development environment. The Vivado suite supports various high-level synthesis, simulation, and analysis tools, facilitating a smoother transition from concept to implementation.

In addition to hardware and software integration, UG154 covers the importance of IP cores, which are pre-designed functional blocks that can be easily integrated into FPGA designs. Xilinx provides a vast library of IP cores, ranging from basic logic functions to sophisticated signal processing algorithms, enabling engineers to accelerate development without sacrificing performance.

Another focus of UG154 is the emphasis on design best practices and optimization techniques that can be employed to maximize the capabilities of Xilinx devices. Topics such as timing closure, resource optimization, and power management are among the critical areas addressed, which help designers achieve the desired performance within the constraints of their applications.

Overall, Xilinx UG154 serves as a vital resource that equips engineers with the knowledge and tools necessary to leverage the full potential of Xilinx FPGAs. By understanding the features, technologies, and architectural characteristics detailed within this guide, designers can create innovative solutions across a range of applications, including telecommunications, automotive, aerospace, and industrial automation.
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