The Virtex-4 features, such as the programmable IDELAY and built-in FIFO support, simplifythe bridging of a high-speed, PCI-X core to large amounts of DDR-SDRAM memory. Onechallenge is meeting the PCI-X target initial latency specification. PCI-X Protocol Addendum tothe PCI Local Bus Specification Revision 2.0a ([Ref 6]) dictates that when a target signals adata transfer, "the target must do so within 16 clocks of the assertion of FRAME#." PCItermination transactions, such as Split Response/Complete, are commonly used to meet thelatency specifications. This method adds complexity to the design, as well as additional systemlatency. Another solution is to increase the ratio of the memory frequency to the PCI-X busfrequency. However, this solution increases the required power and clock resource usage.
上傳時間： 2013-11-24
上傳用戶：18707733937
本文簡單討論并總結(jié)了VHDL、Verilog，System verilog 這三中語言的各自特點和區(qū)別As the number of enhancements to variousHardware Description Languages (HDLs) hasincreased over the past year, so too has the complexityof determining which language is best fora particular design. Many designers and organizationsare contemplating whether they shouldswitch from one HDL to another.
標簽： Verilog verilog System VHDL
上傳時間： 2014-03-03
上傳用戶：zhtzht
Field Programmable Gate Arrays (FPGAs) are becoming a critical part of every system design. Many vendors offer many different architectures and processes. Which one is right for your design? How do you design one of these so that it works correctly and functions as you expect in your entire system? These are the questions that this paper sets out to answer.
上傳時間： 2013-10-22
上傳用戶：lmq0059
針對傳統(tǒng)集成電路（ASIC）功能固定、升級困難等缺點，利用FPGA實現(xiàn)了擴頻通信芯片STEL-2000A的核心功能。使用ISE提供的DDS IP核實現(xiàn)NCO模塊，在下變頻模塊調(diào)用了硬核乘法器并引入CIC濾波器進行低通濾波，給出了DQPSK解調(diào)的原理和實現(xiàn)方法，推導出一種簡便的引入?仔/4固定相移的實現(xiàn)方法。采用模塊化的設(shè)計方法使用VHDL語言編寫出源程序，在Virtex-II Pro 開發(fā)板上成功實現(xiàn)了整個系統(tǒng)。測試結(jié)果表明該系統(tǒng)正確實現(xiàn)了STEL-2000A的核心功能。 Abstract: To overcome drawbacks of ASIC such as fixed functionality and upgrade difficulty, FPGA was used to realize the core functions of STEL-2000A. This paper used the DDS IP core provided by ISE to realize the NCO module, called hard core multiplier and implemented CIC filter in the down converter, described the principle and implementation detail of the demodulation of DQPSK, and derived a simple method to introduce a fixed phase shift of ?仔/4. The VHDL source code was designed by modularity method , and the complete system was successfully implemented on Virtex-II Pro development board. Test results indicate that this system successfully realize the core function of the STEL-2000A.
上傳時間： 2013-11-19
上傳用戶：neu_liyan
Modern electronic systems solve so many difficult problems that they often seem like magic. Nonetheless, these systems all have thesame basic limitation: they need a source of electrical power! Most of the time this is a straightforward challenge for the electronicdesigner, because there are many power-delivery solutions. Yet sometimes a device has no direct power source, and running wiresor replacing batteries is impractical. Even when long-life batteries are usable, they eventually need to be replaced, which requires aservice call.
標簽： 能量收集
上傳時間： 2015-01-03
上傳用戶：zukfu
The high defi nition multimedia interface (HDMI) is fastbecoming the de facto standard for passing digitalaudio and video data in home entertainment systems.This standard includes an I2C type bus called a displaydata channel (DDC) that is used to pass extended digitalinterface data (EDID) from the sinkdevice (such as adigital TV) to the source device (such as a digital A/Vreceiver). EDID includes vital information on the digitaldata formats that the sink device can accept. The HDMIspecifi cation requires that devices have less than 50pFof input capacitance on their DDC bus lines, which canbe very diffi cult to meet. The LTC®4300A’s capacitancebuffering feature allows devices to pass the HDMI DDCinput capacitance compliance test with ease.
上傳時間： 2013-11-21
上傳用戶：tian126vip
This simple SDI Notepad-like application demonstrates how, taking advantage of the MFC support for Unicode, to Turkmenize labels of the specified menu items. Actually, Turkmen is not supported by Windows 2000, therefore, to create such resources as menu so that strings in Turkmen could be displayed I had to invent an additional technique 這是一個與記事本類似的簡單的SDI應用程序，演示了怎樣使用MFC來支持 Unicode，對指定的菜單條目進行Turkmenize標簽化。實際上，Windwos 2000并不支持Turknen,因此,創(chuàng)建了那些菜單資源以便那些字符串可以在Turknen中顯示,為此我必須開發(fā)其它的技術(shù)。 來源: http://www.codeguru.com/advancedui/SDI_Note.html
標簽： Notepad-like demonstrates application advantage
上傳時間： 2013-11-26
上傳用戶：txfyddz
This Unix C code monitors a web server every few minutes by trying to retrieve its home page. It sends you email when it can t connect, and every so often while the server is still down. It sends a final message when it comes back up. If you have email paging, just direct the email to your pager address.
標簽： monitors retrieve minutes server
上傳時間： 2015-01-11
上傳用戶：pompey
CZipFile is a lite library that allows you to get information about a zip archive. It is not able to decompress the files, but just retrieves the contents—the file name, file size, and so on.
標簽： information CZipFile archive library
上傳時間： 2013-12-13
上傳用戶：ruixue198909
Tug of War(A tug of war is to be arranged at the local office picnic. For the tug of war, the picnickers must be divided into two teams. Each person must be on one team or the other the number of people on the two teams must not differ by more than 1 the total weight of the people on each team should be as nearly equal as possible. The first line of input contains n the number of people at the picnic. n lines follow. The first line gives the weight of person 1 the second the weight of person 2 and so on. Each weight is an integer between 1 and 450. There are at most 100 people at the picnic. Your output will be a single line containing 2 numbers: the total weight of the people on one team, and the total weight of the people on the other team. If these numbers differ, give the lesser first. )
上傳時間： 2014-01-07
上傳用戶：離殤
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