Bitstream, Block, Bonded, Boundary scan | Xilinx 8.2i specification

BitGen

Is a program that produces a bitstream for Xilinx device configuration. BitGen takes a fully routed NCD (Circuit Description) file as its input and produces a configuration bitstream, a binary file with a.bit extension.

bitstream

A bitstream is a stream of data that contains location information for logic on a device, that is, the placement of Configurable Logic Blocks (CLBs), Input/Output Blocks (IOBs), (TBUFs), pins, and routing elements. The bitstream also includes empty placeholders that are filled with the logical states sent by the device during a readback. Only the memory elements, such as flip-flops, RAMs, and CLB outputs, are mapped to these placeholders, because their contents are likely to change from one state to another. When downloaded to a device, a bitstream configures the logic of a device and programs the device so that the states of that device can be read back.

A bitstream file has a .bit extension.

block

A block is a group of one or more logic functions.

A block is a schematic or symbol sheet. There are four types of blocks.

--A Composite block indicates that the design is hierarchical.

--A Module block is a symbol with no underlying schematic.

--A Pin block represents a schematic pin.

--An Annotate block is a symbol without electrical connectivity that is used only for documentation and graphics.

bonded

Bonded means connected by a wire.

boundary scan

Boundary scan is the method used for board-level testing of electronic assemblies. The primary objectives are the testing of chip

I/O signals and the interconnections between ICs.

It is the method for observing and controlling all new chip I/O signals through a standard interface called a Test Access Port (TAP). The boundary scan architecture includes four dedicated I/O pins for control and is described in IEEE spec 1149.1.

BSDLAnno

A program that automatically modifies a BSDL file for post- configuration interconnect testing.

Development System Reference Guide

www.xilinx.com

397

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.

Xilinx 8.2i manual Bitstream, Block, Bonded, Boundary scan

Models: 8.2i