DDR SDRAM控制器的VHDL源代碼，含詳細設計文檔。
The DDR, DCM, and SelectI/O™ features in the Virtex™ -II architecture make it the perfect
choice for implementing a controller of a Double Data Rate (DDR) SDRAM. The Digital Clock
Manager (DCM) provides the required Delay Locked Loop (DLL), Digital Phase Shift (DPS),
and Digital Frequency Synthesis (DFS) functions. This application note describes a controller
design for a 16-bit DDR SDRAM. The application note and reference design are ENHANCED
versions of XAPP200 targeted to the Virtex-II series of FPGAs. At a clock rate of 133 MHz,
16-bit data changes at both clock edges. The reference design is fully synthesizable and
achieves 133 MHz performance with automatic place and route tools.
這個軟件包(C++)是我尋找電磁學代碼無意中找到了，功能相當強大（并行計算，快速多極子等）。缺點是安裝相當麻煩，需要若干個其他軟件包。我在Fedora Core9下編譯其中所需blitz++時出錯，在 ubuntu下可以所有均編譯通過，運行時出現一個錯誤，我找不到原因（本人水平有限），但從學習電磁學有關算法／程序設計來說，已經是相當了不起的開源軟件了。parallel unified multipole algorithm for Electromagnetics (Puma-EM).
Aim is providing surface Method of Moments for Electromagnetics, ENHANCED
by using the Multilevel Fast Multipole Method. Code is parallelized and runs on
Desktops and clusters.
H.264/AVC, the result of the collaboration between the ISO/IEC
Moving Picture Experts Group and the ITU-T Video Coding
Experts Group, is the latest standard for video coding. The goals
of this standardization effort were ENHANCED compression efficiency,
network friendly video representation for interactive
(video telephony) and non-interactive applications (broadcast,
streaming, storage, video on demand). H.264/AVC provides
gains in compression efficiency of up to 50％ over a wide range
of bit rates and video resolutions compared to previous standards.
Compared to previous standards, the decoder complexity
is about four times that of MPEG-2 and two times that of
MPEG-4 Visual Simple Profile. This paper provides an overview
of the new tools, features and complexity of H.264/AVC.
Fortran has always been the principal language used in the fields of scientific,
numerical, and engineering programming, and a series of revisions to the standard
defining successive versions of the language has progressively ENHANCED its power
and kept it competitive with several generations of rivals.
Beginning in 1978, the technical committee responsible for the development
of Fortran standards, X3J3 (now called J3), laboured to produce a new, much-
needed modern version of the language, Fortran 90. Its purpose is to "promote
portability, reliability, maintainability, and efficient execution... on a variety of
computing systems". The standard was published in 1991, and work began in
1993 on a minor revision, known informally as Fortran 95. Now this revised
H.264/AVC is the current video standardization project of the ITU-T Video Coding
Experts Group (VCEG) and the ISO/IEC Moving Picture Experts Group (MPEG). The
main goals of this standardization effort are to develop a simple and straightforward
video coding design, with ENHANCED compression performance, and to provide a
鈥渘etwork-friendly鈥?video representation which addresses 鈥渃onversational鈥?(video
telephony) and 鈥渘on-conversational鈥?(storage, broadcast or streaming) applications.
The STi7200 is a new generation, high-definition set-top box/DVD decoder chip, and
provides very high performance for low-cost HD systems. With ENHANCED performance over
the STx7109, it includes both Windows Media Video 9 and H.264 video decoders for new,
low bitrate applications. The STi7200 is able to decode two HD programs
Recently millimeter-wave bands have been postu-
lated as a means to accommodate the foreseen extreme bandwidth
demands in vehicular communications, which result from the
dissemination of sensory data to nearby vehicles for ENHANCED
environmental awareness and improved safety level. However, the
literature is particularly scarce in regards to principled resource
allocation schemes that deal with the challenging radio conditions
posed by the high mobility of vehicular scenarios
