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Chapter 5

Using the Client Side Data Path

This chapter provides general guidelines for creating designs using the GEMAC core, including a detailed description of each client-side data flow interface of the core.

Definitions of the abbreviations used throughout the remainder of this chapter are defined in Table 5-1.

Table 5-1:Abbreviations Used in Timing Diagrams

Abbreviation

Definition

 

 

DA

Destination address; 6 bytes

 

 

SA

Source address; 6 bytes

 

 

L/T

Length/type field; 2 bytes

 

 

FCS

Frame check sequence; 4 bytes

 

 

Receiving Inbound Frames

Received Ethernet frames are presented to the client logic on the Receiver subset of the Client-Side Interface. For port definition, see “Receiver Interface,” on page 27.

Normal Frame Reception

Figure 5-1illustrates the timing of a normal inbound frame transfer. The client must be prepared to accept data at any time; there is no buffering within the MAC to allow for latency in the receive client. Once frame reception begins, data is transferred on consecutive clock cycles to the receive client until the frame is complete. The MAC asserts the rx_good_frame signal to indicate that the frame was successfully received and that the frame should be analyzed by the client.

1-Gigabit Ethernet MAC v8.5 User Guide

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UG144 April 24, 2009

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Xilinx UG144 manual Using the Client Side Data Path, Receiving Inbound Frames, Normal Frame Reception

UG144 specifications

The Xilinx UG144, a comprehensive user guide for the versatile Zynq-7000 SoC (System on Chip) architecture, serves as an essential resource for developers and engineers designing embedded systems. Emphasizing the blend of programmable logic and processing power, this guide highlights the array of features and technologies that make the Zynq-7000 series particularly attractive for a wide range of applications.

One of the standout characteristics of the Zynq-7000 is its dual-core ARM Cortex-A9 processor, which delivers substantial performance for complex processing tasks. This soft processor enables high-speed computation, making it ideal for applications in fields such as automotive, industrial automation, and telecommunications. The guide emphasizes the ability to run multiple operating systems, including Linux and real-time operating systems, providing developers with versatile options for application design.

Additionally, the Xilinx UG144 outlines the extensive programmable logic resources integrated within the Zynq-7000 device. This FPGA fabric allows for customization and parallel processing capabilities, allowing designers to create powerful hardware accelerators tailored to specific application needs. The guide details how these programmable logic resources can easily interface with the ARM processors through a high-bandwidth AXI interface, promoting efficient data flow between the hardware and software components.

Key features highlighted in the UG144 include advanced connectivity options, including PCIe, USB, and Serial interfaces, which facilitate communication with other devices and systems. Furthermore, the guide provides insights into the supported design tools, such as the Xilinx Vivado Design Suite, which aids in both hardware and software co-design. This integrated environment significantly reduces development time while providing an efficient workflow for prototyping and testing.

In terms of performance optimizations, the guide discusses support for digital signal processing (DSP) capabilities, making the Zynq-7000 suitable for high-performance applications such as video processing and data analytics. The built-in DSP slices allow for efficient execution of complex mathematical functions, which is crucial for real-time data processing tasks.

Overall, the Xilinx UG144 guide encapsulates the versatility, performance, and flexibility of the Zynq-7000 SoC architecture. With its combination of ARM processing and programmable logic, along with robust connectivity options and development tools, it empowers engineers to create innovative solutions across a spectrum of industries, solidifying Xilinx's position as a leader in the field of embedded system design.