Sink Core

R

operations occurring on the sink user interface. Configure the SnkAFThresAssert value according to your specific system requirements.

See “FifoAFMode and Sink Almost Full,” page 67 for a description of the behavior of Sink FIFO interface when the Sink Almost Full flag is asserted.

Sink Overflow

The assertion of Sink Overflow flag (SnkOverflow_n) indicates that there is a write operation attempted on the FIFO when there are no empty FIFO locations available. This results in data loss since no more data will be written into the FIFO until it is not in a full state. When the overflow condition occurs, it is recommended that you reset the FIFO since data corruption has occurred. To avoid the overflow condition, you should use the Sink Almost Full flag to gauge the readiness of the sink core to receive data (see “FifoAFMode and Sink Almost Full,” page 67.)

Sink Status and Flow Control Signals

The Sink Status FIFO interface enables you to send flow control data on the SPI-4.2 Interface. The channel order and frequency that the status is sent is user-programmed in a calendar. A two-bit register is provided for each location in the calendar to store the channel status information (hungry=01, starving=00, satisfied=10). Figure 4-6illustrates how the calendar information is retrieved to determine the order and frequency that a particular channel’s FIFO Status information is transmitted on RStat. A detailed description of the calendar interface and the Status FIFO interface is provided in the following section. A summary of the Sink Status Path signals and their definitions is provided in Table 2-4and Table 2-5.

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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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