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Xilinx 8.2i Boundary Scan Behavior in Xilinx Devices, Modifications to the Designwarning Section

Models: 8.2i

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Chapter 15: BSDLAnno

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Modifications to the DESIGN_WARNING Section

BSDLAnno adds the following DESIGN_WARNING to the BSDL file:

"This BSDL file has been modified to reflect post-configuration"& behavior by BSDLAnno. BSDLAnno does not modify the USER1,"& USER2, or USERCODE registers. For details on the features and" & limitations of BSDLAnno, please consult the Xilinx Development" & System Reference Guide.";

Header Comments

BSDLAnno adds the following comments to the BSDL file header:

♦BSDLAnno Post-Configuration File for design [entity name]

♦BSDLAnno [BSDLAnno version number]

Boundary Scan Behavior in Xilinx Devices

BSDL files provided by Xilinx reflect the boundary scan behavior of an unconfigured device. After configuration, the boundary scan behavior of a device may change. I/O pins that were bidirectional before configuration may now be input-only. Boundary Scan test vectors are typically derived from BSDL files; therefore, if boundary scan tests are going to be performed on a configured Xilinx device, the BSDL file should be modified to reflect the configured boundary scan behavior of the device.

Whenever possible, boundary scan tests should be performed on an unconfigured Xilinx device. Unconfigured devices allow for better test coverage, because all I/Os are available for bidirectional scan vectors.

In most cases, boundary scan tests with Xilinx devices must be performed after FPGA configuration only under the following circumstances:

•When configuration cannot be prevented

•When differential signaling standards are used, unless the differential signals are located between Xilinx devices, in which case both devices can be tested before configuration. Each side of the differential pair will behave as a single-ended signal.

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Xilinx 8.2i manual Boundary Scan Behavior in Xilinx Devices, Modifications to the Designwarning Section, Header Comments
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8.2i specifications

Xilinx 8.2i is a significant version of the Xilinx ISE (Integrated Software Environment) that emerged in the early 2000s, marking an important milestone in the world of FPGA (Field-Programmable Gate Array) development. This version introduced a slew of advanced features, technologies, and characteristics that made it an indispensable tool for engineers and developers in designing, simulating, and implementing digital circuits.

One of the standout features of Xilinx 8.2i is its enhanced design entry capabilities. This version supports multiple design entry methods, including schematic entry, VHDL, and Verilog HDL, giving engineers the flexibility to choose their preferred approach. The integrated environment provides user-friendly graphical interfaces, making it accessible for both novice and experienced users.

Xilinx 8.2i's synthesis tools have been improved to enable more efficient design compilation and optimization. The new algorithms used in this version facilitate faster synthesis times while reducing power consumption and improving performance. Furthermore, it features support for advanced FPGA architectures, which allows for the implementation of more complex designs with greater efficiency.

The implementation tools in Xilinx 8.2i include advanced place and route capabilities, utilizing state-of-the-art algorithms for optimized resource usage. These tools enable designers to make better use of FPGA resources, ensuring that designs fit within the constraints of the target device while maximizing performance.

Another key characteristic of Xilinx 8.2i is its extensive support for various Xilinx devices such as the Spartan, Virtex, and CoolRunner series. This compatibility ensures that developers can leverage the powerful features of these FPGA families, including high-speed transceivers and DSP slices.

Xilinx 8.2i also places a strong emphasis on simulation and verification. The version integrates with various simulation tools, allowing for thorough testing of the designs before implementation. This reduces the risk of errors and ensures that the final product meets specifications.

In addition, this version includes support for design constraints, enabling engineers to specify timing, area, and other critical design parameters. By accommodating constraints, Xilinx 8.2i helps in achieving reliable and efficient designs tailored to project needs.

In summary, Xilinx 8.2i is a robust software development tool that enhances the design process for FPGAs. Its comprehensive features, including multiple design entry options, advanced synthesis and implementation tools, extensive device support, and strong simulation capabilities, make it a valuable resource for engineers and developers striving for innovation in digital design.