ARM核心是主控SOC中的重要部分，系统的日常应用都由ARM核心来完成，因此ARM核心的效能很大程度上跟用户体验有关。ARM公司一般用DMIPS/MHz来标称ARM核心的性能。DMIPS是Dhrystone Million Instructions executed PER Second的缩写，反映核心的整数计算能力。但Dhrystone算法代码本身比较叫，可以完全放到Cache中执行，因此反映的只是核心能力，并不能反映缓存、内存I/O性能。
上传时间： 2013-10-16
上传用户：devin_zhong
本软件是关于MAX338, MAX339的英文数据手册：MAX338, MAX339 8通道/双4通道、低泄漏、CMOS模拟多路复用器 The MAX338/MAX339 are monolithic, CMOS analog multiplexers (muxes). The 8-channel MAX338 is designed to connect one of eight inputs to a common output by control of a 3-bit binary address. The dual, 4-channel MAX339 is designed to connect one of four inputs to a common output by control of a 2-bit binary address. Both devices can be used as either a mux or a demux. On-resistance is 400Ω max, and the devices conduct current equally well in both directions. These muxes feature extremely low off leakages (less than 20pA at +25°C), and extremely low on-channel leakages (less than 50pA at +25°C). The new design offers guaranteed low charge injection (1.5pC typ) and electrostatic discharge (ESD) protection greater than 2000V, PER method 3015.7. These improved muxes are pin-compatible upgrades for the industry-standard DG508A and DG509A. For similar Maxim devices with lower leakage and charge injection but higher on-resistance, see the MAX328 and MAX329.
上传时间： 2013-11-12
上传用户：18711024007
This application note describes how the existing dual-port block memories in the Spartan™-IIand Virtex™ families can be used as Quad-Port memories. This essentially involves a dataaccess time (halved) versus functionality (doubled) trade-off. The overall bandwidth of the blockmemory in terms of bits PER second will remain the same.
上传时间： 2014-01-24
上传用户：15527161163
This application note covers the design considerations of a system using the PERformance features of the LogiCORE™ IP Advanced eXtensible Interface (AXI) Interconnect core. The design focuses on high system throughput through the AXI Interconnect core with F MAX and area optimizations in certain portions of the design. The design uses five AXI video direct memory access (VDMA) engines to simultaneously move 10 streams (five transmit video streams and five receive video streams), each in 1920 x 1080p format, 60 Hz refresh rate, and up to 32 data bits PER pixel. Each VDMA is driven from a video test pattern generator (TPG) with a video timing controller (VTC) block to set up the necessary video timing signals. Data read by each AXI VDMA is sent to a common on-screen display (OSD) core capable of multiplexing or overlaying multiple video streams to a single output video stream. The output of the OSD core drives the DVI video display interface on the board. PERformance monitor blocks are added to capture PERformance data. All 10 video streams moved by the AXI VDMA blocks are buffered through a shared DDR3 SDRAM memory and are controlled by a MicroBlaze™ processor. The reference system is targeted for the Virtex-6 XC6VLX240TFF1156-1 FPGA on the Xilinx® ML605 Rev D evaluation board
上传时间： 2013-11-23
上传用户：shen_dafa
Computes the PERmanent of a nonnegative integer matrix. Notes: Compile in C++, "g++ -o PERmanent PERmanent.c".
标签： PERmanent nonnegative Computes Compile
上传时间： 2013-12-23
上传用户：zhangyi99104144
function y_cum = cum2x (x,y, maxlag, nsamp, overlap, flag) ％CUM2X Cross-covariance ％ y_cum = cum2x (x,y,maxlag, samp_seg, overlap, flag) ％ x,y - data vectors/matrices with identical dimensions ％ if x,y are matrices, rather than vectors, columns are ％ assumed to correspond to independent realizations, ％ overlap is set to 0, and samp_seg to the row dimension. ％ maxlag - maximum lag to be computed [default = 0] ％ samp_seg - samples PER segment [default = data_length] ％ overlap - PERcentage overlap of segments [default = 0] ％ overlap is clipped to the allowed range of [0,99].
标签： cum2x y_cum Cross-covariance function
上传时间： 2015-09-08
上传用户：xieguodong1234
The Staged Event-Driven Architecture (SEDA) is a new design for building scalable Internet services. SEDA has three major goals: To support massive concurrency, on the order of tens of thousands of clients PER node To exhibit robust PERformance under wide variations in load and, To simplify the design of complex Internet services. SEDA decomposes a complex, event-driven application into a set of stages connected by queues. This design avoids the high overhead associated with thread-based concurrency models, and decouples event and thread scheduling from application logic. SEDA enables services to be well-conditioned to load, preventing resources from being overcommitted when demand exceeds service capacity. Decomposing services into a set of stages also enables modularity and code reuse, as well as the development of debugging tools for complex event-driven applications.
标签： Event-Driven Architecture Internet building
上传时间： 2015-09-28
上传用户：日光微澜
Delphi and C++ Builder component for direct access to IO ports on Windows 95, Windows 98 and Windows NT/2000. Provides proPERties for reading and writing bytes, words and doublewords from/to IO ports. New fast block data transfer methods enable to read and write megabytes of data PER second.
标签： Windows and component Builder
上传时间： 2015-10-25
上传用户：bjgaofei
Input The input contains blocks of 2 lines. The first line contains the number of sticks parts after cutting, there are at most 64 sticks. The second line contains the lengths of those parts separated by the space. The last line of the file contains zero. Output The output should contains the smallest possible length of original sticks, one PER line. Sample Input 9 5 2 1 5 2 1 5 2 1 4 1 2 3 4 0 Sample Output 6 5
标签： contains The blocks number
上传时间： 2015-10-27
上传用户：lepoke
This document provides guidelines for integrating a discrete high speed USB host controller onto a fourlayer desktop motherboard. The material covered can be broken into three main categories: Board design guidelines, EMI/ESD guidelines and front panel USB guidelines. Section 1.1 Background provides an explanation of the routing exPERiments and testing PERformed to validate the feasibility of 480 Megabits PER second on an actual motherboard. Section 7 contains a design checklist that lists each design recommendation described in this document. High speed USB oPERation is described in the USB 2.0 Specification (http://www.usb.org/develoPERs/docs.html).
标签： integrating controller guidelines document
上传时间： 2013-11-27
上传用户：电子世界
