Xilinx System Generator v2.1 Reference Guide

Depuncture

The Xilinx Depuncture block allows you to insert arbitrary symbol into your input data at the location specified by the depuncture code and creates a new value. This value is presented as output from the block. The Xilinx depuncture block accepts data of type UFixN_0 where N

equals the length of insert string x (the number of ones in the depuncture code) and produces output data of type UFixK_0 where K equals the length of insert string x (the length of the depuncture code ).

The Xilinx Depuncture block can be used to decode a range of punctured convolution codes. The following diagram illustrates an application of this block to implement soft decision Viterbi decoding of punctured convolution codes.

Figure 3-32: Example of Depuncture block use

The previous diagram shows a matched filter block connected to a serial to parallel block. The serial to parallel block concatenates two continuous soft inputs and presents it as a 6-bit word to the depuncture block. The depuncture block inserts the symbol '100' after the 3-bits from the MSB for code 0 ( [1 0 1] ) and 6-bits from the MSB for code 1 ( [1 1 0] ) to form a 9-bit word. The output of the depuncture block is serialized as soft decision 3-bit input words for the Viterbi decoder which decodes the punctured convolutional code and outputs the decoded data.

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Xilinx V2.1 manual Example of Depuncture block use

V2.1 specifications

Xilinx V2.1 is a notable iteration in the series of versatile and robust Field-Programmable Gate Arrays (FPGAs) developed to cater to a wide range of applications. Launched to provide enhancements in performance and flexibility, V2.1 embodies sophisticated technologies and features that stand out in the electronics industry.

One of the primary features of Xilinx V2.1 is its improved processing power. The architecture has been optimized to support higher clock speeds and increased logic density, allowing for more complex designs to be implemented effectively. This boost in performance is facilitated by utilizing advanced silicon technologies, which significantly reduce power consumption while maximizing efficiency.

Another significant characteristic of Xilinx V2.1 is its enhanced I/O (Input/Output) capabilities. The device supports a variety of industry-standard interfaces, which include PCI Express, SATA, and various serial communication protocols. Such adaptability ensures seamless integration into existing systems, providing engineers with the flexibility to adapt to various application requirements without the need for substantial redesign efforts.

Xilinx V2.1 also features improved scalability, making it a prime choice for applications that demand diverse performance levels. This device supports an array of configurations and can be used in small-scale projects as well as in larger, more demanding environments requiring extensive resources. This scalability is further aided by support for multiple development platforms, enabling rapid prototyping and simplifying the design process.

Security is increasingly becoming a priority in digital design, and Xilinx V2.1 addresses this concern via hardware security features. It includes enhanced encryption protocols and secure boot functionalities, which help protect intellectual property and sensitive data from unauthorized access.

Additionally, the integration of advanced DSP (Digital Signal Processing) blocks allows Xilinx V2.1 to efficiently handle data-intensive tasks such as video processing and real-time signal analysis. These capabilities make it suitable for applications in telecommunications, automotive systems, and industrial automation.

Xilinx V2.1 also benefits from a rich development environment, including robust software tools that facilitate design entry, simulation, and verification. The support for industry-standard programming languages like VHDL and Verilog simplifies the development process, enabling engineers to design complex systems more efficiently.

In summary, Xilinx V2.1 stands out due to its impressive combination of high performance, flexibility, scalability, security, and comprehensive development support. These features make it a valuable asset for engineers and developers looking to innovate across various sectors, from telecommunications and automotive to industrial applications.