Sink Clocking Options

R

defined in Table 2-9, page 30. For all architectures other than Virtex-4 or Virtex-5 devices, user clocking can only be implemented using global clocking resources.

RDClk_P

RDClk_N

User

Clocking

Example

Module

SPI-4.2 Lite Sink Core

(Configured with User Clocking)

RDClk0_user

RDClk0_USER

RDClk180_user

RDClk180_USER

Figure 6-2:Example: Sink User Clocking Inputs

When targeting the Virtex-4 and Virtex-5 device architectures, the user clocking module can be configured to use global or regional clocking distribution. Table 6-2provides the clocking resource count for the user clocking configurations.

Table 6-2:Sink Core User Clocking Resources

Clocking Option

BUFR

BUFG

DCM

 

 

 

 

Global clocking

0

1

1

 

 

 

 

Regional clocking

1

1a

0

a.The Sink core requires the SnkIdelayRefClk clock (200 MHZ reference clock to be driven by a global clock buffer. This reference clock provides a time reference to IDELAYCTRL modules to calibrate all the individual delay elements (IDELAY) in the region. Multiple cores need only one global clock buffer to distribute the SnkIdelayRefClk clock.

Global Clocking

This implementation uses the DCM and global clock routing to generate a full-rate clock (RClk0_USER) and inverted full-rate clock (RDClk180_USER). This configuration is illustrated in Figure 6-3. Note that the inverter used to generate the RDClk180_USER clock will be absorbed into the DDR flops.

SPI-4.2 Lite v4.3 User Guide

www.xilinx.com

113

UG181 June 27, 2008

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Xilinx UG181 manual Global Clocking, Sink Clocking Options, 2Sink Core User Clocking Resources Clocking Option
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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.
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