Xilinx System Generator v2.1 Reference Guide

FIFO

The Xilinx FIFO block implements a First-In-First-Out memory queue.

Values presented at the module’s data-input port is written to the next available empty memory location when the write-enable input is one. The memory full status output port is assserted to one when no unused locations remain in the module’s internal memory. The percent full output port indicates the percentage of internal memory in use, represented with user-specified precision. By asserting the read-enable input port, data can be read out of the FFO via the data output port (dout) in the order in which they were written. The

memory-empty status output (empty) indicates that no more data reside in the memory.

The FIFO can be implemented either using distributed or block RAM. If distributed memory is selected, the maximum depth of the FIFO is 256. If block RAM is used, the maximum depth is 64K words.

Block Parameters Dialog Box

The block parameters dialog box can be invoked by double-clicking the icon in your Simulink mode.

Figure 3-72: FIFO block parameters dialog box

Parameters specific to the FIFO block are:

Depth: specifies the number of words that can be stored.

Bits of Precision to Use for Percent Full Signal: specifies the number of bits that will be output from the %full port. The binary point for this unsigned output is always at the top of the word. Thus, if the Bits of Precision is set to one, the output can take on two values: 0.0 and 0.5, the latter indicating that the FIFO is at least 50% full. Given two bits of precision, the possible output values are 0.00, 0.25, 0.50 and 0.75.

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Xilinx V2.1 manual Fifo

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.