-
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.
標簽：
SDRAM
VHDL
DDR
控制器
上傳時間：
2014-11-01
上傳用戶：l254587896
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The AVRcam source files were built using the WinAVR distribution
(version 3.3.1 of GCC). I haven t tested other versions of GCC,
but they should compile without too much difficulty.
* The source files for the AVRcam had the author name and copyright
information added back into them after the judging of the project,
since it states in the competition rules that the author s name
can not be present during their inspection.
* The included source files are the ones that were submitted for
the entry into the Circuit Cellar contest. I have continued to
develop the AVRcam, and have added several new features (such as
ignoring objects that aren t larger than a minimum size, removing
tracked objects that overlap with each, and some general
optimizations). If you are interested in the latest source,
email me at john@jrobot.net
* For more info about the AVRcam, check out http://www.jrobot.net
John Orlando
August 20, 2004
標簽：
distribution
version
AVRcam
source
上傳時間：
2016-12-30
上傳用戶：GavinNeko
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A novel met hod t o p artially compensate sigma2delta shap ed noise is p rop osed. By injecting t he comp en2
sation cur rent int o t he p assive loop f ilte r during t he delay time of t he p hase f requency detect or ( PFD) , a maximum
reduction of t he p hase noise by about 16dB can be achieved. Comp a red t o ot he r compensation met hods , t he tech2
nique p rop osed he re is relatively simple and easy t o implement . Key building blocks f or realizing t he noise cancel2
lation , including t he delay va riable PFD and comp ensation cur rent source , a re sp ecially designed. Bot h t he behavior
level and circuit level simulation results a re p resented.
標簽：
sigma2delta
compensate
injecting
artially
上傳時間：
2013-12-18
上傳用戶：qlpqlq
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開源備份軟件源碼
AMANDA, the Advanced Maryland Automatic Network Disk Archiver, is a backup system that allows the administrator to set up a single master backup server to back up multiple hosts over network to tape drives/changers or disks or optical media. Amanda uses native dump and/or GNU tar facilities and can back up a large number of workstations running multiple versions of Unix. Amanda uses Samba, Cygwin or a native Windows client to back up Microsoft Windows desktops and servers
標簽：
Automatic
Advanced
Maryland
Archiver
上傳時間：
2017-01-13
上傳用戶：xc216
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This document describes how to switch to and program the unisersal serial bus (USB)
analog phase-locked loop (APLL) on the C5506/C5507/C5509A devices. Example
assembly programs for programming and switching to and from the APLL are also
provided in the attached zip file. It is assumed that the reader is familiar with the use
and operation of the C5506/C5507/C5509A USB digital phase-locked loop (DPLL) and
C55x™ Digital Signal Processor (DSP) IDLE procedures.
標簽：
describes
unisersal
document
phase-lo
上傳時間：
2014-01-13
上傳用戶：hustfanenze
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Instead of finding the longest common
subsequence, let us try to determine the
length of the LCS.
Then tracking back to find the LCS.
Consider a1a2…am and b1b2…bn.
Case 1: am=bn. The LCS must contain am,
we have to find the LCS of a1a2…am-1 and
b1b2…bn-1.
Case 2: am≠bn. Wehave to find the LCS of
a1a2…am-1 and b1b2…bn, and a1a2…am and
b b b
b1b2…bn-1
Let A = a1 a2 … am and B = b1 b2 … bn
Let Li j denote the length of the longest i,g g
common subsequence of a1 a2 … ai and b1 b2
… bj.
Li,j = Li-1,j-1 + 1 if ai=bj
max{ L L } a≠b i-1,j, i,j-1 if ai≠j
L0,0 = L0,j = Li,0 = 0 for 1≤i≤m, 1≤j≤n.
標簽：
the
subsequence
determine
Instead
上傳時間：
2013-12-17
上傳用戶：evil
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PowerPCB教程簡介
歡迎使用 PowerPCB 教程。本教程描述了PADS-PowerPCB 的絕大部分功能
和特點，以及使用的各個過程，這些功能包括：
· 基本操作
· 建立元件(Component)
· 建立板子邊框線(Board outline)
· 輸入網表(Netlist)
· 設置設計規則(Design Rule)
·元件(Part)的布局(Placement)
· 手工和交互的布線
· SPECCTRA全自動布線器(Route Engine)
·覆銅(Copper Pour)
· 建立分隔/混合平面層(Split/mixed Plane)
· Microsoft 的目標連接與嵌入(OLE)(Object Linking Embedding)
· 可選擇的裝配選件(Assembly options)
· 設計規則檢查(Design Rule Check)
· 反向標注(Back Annotation)
· 繪圖輸出(Plot Output)
使用本教程后，你可以學到印制電路板設計和制造的許多基本知識。
你不必一次完成整個教程，如果在任何時候退出后，下次直接找到你要進入
的部分，繼續學習本教程。
當你完成了本教程的學習后，可以參考在線幫助(On-line Help)以便得到更多
的信息。如果你需要附加的信息內容，你可以與PADS 在各地辦事處或代理商取
得聯系，以便得到更多的幫助。
歡迎使用PowerPCB進行PCB設計！
標簽：
PowerPCB
PADS-PowerPCB
教程
分
上傳時間：
2013-12-12
上傳用戶：caozhizhi
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SuperLU is a general purpose library for the direct solution of large, sparse, nonsymmetric systems of linear equations on high performance machines. The library is written in C and is callable from either C or Fortran. The library routines will perform an LU decomposition with partial pivoting and triangular system solves through forward and back substitution. The LU factorization routines can handle non-square matrices but the triangular solves are performed only for square matrices. The matrix columns may be preordered (before factorization) either through library or user supplied routines. This preordering for sparsity is completely separate from the factorization. Working precision iterative refinement subroutines are provided for improved backward stability. Routines are also provided to equilibrate the system, estimate the condition number, calculate the relative backward error, and estimate error bounds for the refined solutions.
標簽：
nonsymmetric
solution
SuperLU
general
上傳時間：
2017-02-20
上傳用戶：lepoke
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mkdosfs - Make DOS file system utilty.
I wrote this, partially to complement the dosfsck utility written by Werner
Almesberger (who graciously gave me some pointers when I asked for some
advice about writing this code), and also to avoid me having to boot DOS
just to create data partitions (I use Linux to back up DOS :-) ).
標簽：
complement
partially
mkdosfs
dosfsck
上傳時間：
2017-03-01
上傳用戶：gonuiln
-
cordic methods describe essentially the same algorithm that with suitably chosen inputs can be used to calculate a whole range of scientific functions including sin, cos, tan, arctan, arcsin, arccos, sinh, cosh, tanh, arctanh, log, exp, square root and even multiply and divide.
the method dates back to volder [1959], and due to its versatility and compactness, it made possible the microcoding of the hp35 pocket scientific calculator in 1972.
here is some code to illustrate the techniques. ive split the methods into three parts linear, circular and hyperbolic. in the hp35 microcode these would be unified into one function (for space reasons). because the linear mode can perform multiply and divide, you only need add/subtract and shift to complete the implementation.
you can select in the code whether to do the multiples and divides also by cordic means. other multiplies and divides are all powers of 2 (these dont count). to eliminate these too, would involve ieee hackery.
標簽：
essentially
algorithm
describe
suitably
上傳時間：
2017-03-02
上傳用戶：litianchu
