Samples the mode pins to determine the configuration mode.Detects power-up (Power-On Reset) or PROG being Low.The configuration process always executes the following sequence:
#Xilinx ise 14.6 limitations software
The bitstream configuration information is generated by the Xilinx ISE development software using a program called BitGen. JTAG mode uses Boundary-Scan protocols to load bit-serial configuration data.
#Xilinx ise 14.6 limitations serial
Alternatively, Serial Peripheral Interface (SPI) and Byte Peripheral Interface (BPI) modes interface with industry-standard flash memories and are clocked by the FPGA's CCLK output. For byte- and word-wide configurations, Master SelectMap mode generates the CCLK signal while Slave SelectMap mode receives the CCLK signal for the 8-, 16-, or 32-bit-wide transfer. Several methods and data formats for loading configuration are available, determined by the levels on the three Mode pins.īit-serial configurations can be either Master Serial where the FPGA generates the configuration clock ( CCLK) signal, or Slave Serial where the external configuration data source also clocks the FPGA. This storage can also be reloaded at any time by pulling the PROG pin Low. The configuration storage is volatile and must be reloaded whenever the FPGA is powered up. The array size is between 8 Mb and 79 Mb (1 to 10 MB), depending on device size but independent of the specific user-design implementation, unless compression mode is used. Like all other Xilinx FPGAs, Virtex-5 FPGAs store their customized configuration in SRAM-type internal latches. This paper should create significant enthusiasm in many designers who before did not have the patience or the motivation to study the full-up User Guides. The idea is to give the designer enough information to evaluate the capabilities, without requiring weeks of study. This paper describes the capabilities (what you can do) in detail, but leaves out the implementation details (how to utilize the capabilities). By comparison, the User Guides give all the details that the designer needs, but – at more than a thousand pages – it may require weeks of work to read and understand all of the details. It describes the functionality of these devices in far more detail than in the data sheet, but avoids the minute implementation details covered in the various Virtex 5 FPGA User Guides.Īny designer contemplating designing with Virtex-5 FPGAs faces a dilemma: The first four pages of the data sheet give very concentrated information about the whole family, without describing the capabilities in enough detail. This paper gives potential users an easy-to-grasp idea of the capabilities of the device functions of Xilinx Virtex-5 FPGAs. My message is: "If you write them, they will come." So, over the course of time, I hope to build a little "library" of these guides. I would love to see the same treatment for all of the major FPGA and CPLD families from all of the vendors. In fact I think that this is an incredibly good idea. Which brings us to this article, which is a User-Guide Lite for the Xilinx Virtex-5 family of FPGAs. The point is, where do you go to learn more about a specific family of FPGAs, for example? The vendor's data sheets are great if you are already an expert looking for a specific nugget of information, but more-often-than-not they are a pain in the rear end, telling you everything except the fact you're trying to tie down.Īt the other end of the spectrum are the vendor's main User Guides, but these can number hundreds or thousands of pages and are presented in such excruciating detail as to bring even the strongest amongst us to our knees. But one of my favorite sayings (in addition to someone else exclaiming "My round, I think!" ) is the classic: "Rules are intended for the guidance of wise men and the blind obedience of fools."
![xilinx ise 14.6 limitations xilinx ise 14.6 limitations](https://i.ytimg.com/vi/KOTLVQS3XGM/hqdefault.jpg)
As opposed to wading through more than 1,000 pages of Virtex-5 User-Guide documentation, this "User Guide Lite " boils all the key details down into a few easily-digestible pages.Įditor's Note: Generally speaking we (Programmable Logic DesignLine) are not in the business of publishing user guides for specific device families.