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Chapter 6: Special Design Considerations

cores. An example of using the Slave core to either share clock resources between Source cores or to implement a custom clocking solution is shown in Figure 6-5.

Source Core:

Master Clocking

Clocking

Module

Source Core:

Slave Clocking

Source clocks shared between multiple cores

Source Core:

Slave Clocking

Custom

Clocking

Module

Figure 6-5:Source Clocking: Master and Slave Implementation

Master and slave clocking configurations are described in the following sections.

Master Clocking

The master clocking configuration contains the clocking logic internal to the core. For all architectures other than Virtex-4 and Virtex-5 FPGAs, user clocking can only be implemented using global clocking resources. When targeting the Virtex-4 or Virtex-5 device architectures, embedded clocking can be configured in one of two ways:

Global Clocking

This implementation uses the DCM and global clock routing to generate a full-rate clock (SysClk0_GP), an inverted full-rate clock (SysClk180_GP), and the quarter-rate clock (TSClk_GP). The global clocking implementation for SysClk is illustrated in Figure 6-6and the global clocking implementation for TSClk is illustrated Figure 6-7. Note that the inverter used to generate the SysClk180 clock will be absorbed into the DDR flops.

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UG181 June 27, 2008

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Xilinx UG181 manual Master Clocking, 5Source Clocking Master and Slave Implementation

UG181 specifications

Xilinx UG181 refers to the User Guide for the Xilinx 7 Series FPGAs, which offers a comprehensive overview of the architecture, capabilities, and features of these powerful field-programmable gate arrays (FPGAs). Designed to cater to a wide range of applications, Xilinx 7 Series FPGAs are widely adopted in industries such as telecommunications, automotive, aerospace, and consumer electronics.

One of the main features of the Xilinx 7 Series FPGAs is their use of advanced 28nm technology, which enables them to achieve high performance while maintaining low power consumption. This fine process technology not only ensures better power efficiency but also allows for increased logic density. The 7 Series includes several families, such as Artix-7, Kintex-7, and Virtex-7, each tailored for specific application demands ranging from cost-sensitive solutions to high-performance data processing.

Xilinx 7 Series FPGAs also incorporate a rich set of programmable logic resources. This includes Look-Up Tables (LUTs), Flip-Flops, and Digital Signal Processing (DSP) slices that have been optimized for various arithmetic functions. With several thousands of logic cells available, designers can implement complex algorithms and systems directly in hardware for improved performance over traditional software solutions.

In addition to their logic capabilities, Xilinx 7 Series FPGAs feature an array of high-speed serial communication interfaces. These include support for technologies like PCI Express, Gigabit Ethernet, and Serial RapidIO, which facilitate efficient data transfer and integration into enterprise-level systems. The presence of high-speed transceivers also makes them ideal for applications that require fast data handling like video processing or high-frequency trading.

Furthermore, these FPGAs offer extensive memory options, including support for a wide range of external memory interfaces. This versatility allows for the integration of high-bandwidth memory solutions, which is essential for performance-intensive applications. With the introduction of the Memory Controller IP, users can easily connect various memory types, ensuring flexibility in system design.

Finally, Xilinx has made significant strides in development tools for 7 Series FPGAs, providing a robust ecosystem for design engineers. With design suites such as Vivado and SDK, users benefit from a comprehensive platform for deciding, simulating, and implementing designs efficiently. The combination of advanced hardware capabilities and powerful software tools solidifies the position of Xilinx 7 Series FPGAs as a preferred choice for custom digital hardware design across various industries.