Image Superscalarpipeline.svg thumb 300px right Simple superscalar pipeline. By fetching and dispatching ... T3E CRAY T3e supercomputer with four superscalar Alpha 21164 processors A superscalar Central processing ... otherwise be possible at a given clock rate . A superscalar processor executes more than one instruction ... . In the Flynn taxonomy , a single core superscalar processor is classified as an SISD processor Single Instructions, Single Data , while a multi core superscalar processor is classified as an MIMD processor Multiple Instructions, Multiple Data . While a superscalar CPU is typically also instruction pipeline pipeline d, pipelining and superscalar architecture are considered different performance enhancement techniques. The superscalar technique is traditionally associated with several identifying ... Cray s CDC 6600 from 1965 is often mentioned as the first superscalar design. The Intel i960 CA 1988 and the AMD 29000 series 29050 1990 microprocessors were the first commercial single chip superscalar microprocessors. RISC CPUs like these were the first microprocessors to use the superscalar ... since about 1998 are superscalar. The P5 microarchitecture P5 Pentium brand Pentium was the first superscalar x86 processor the Nx586 , P6 microarchitecture P6 Pentium Pro and AMD K5 were among ... sequences prior to actual execution on a superscalar microarchitecture this opened up for dynamic ... Cyrix 6x86 . From scalar to superscalar The simplest processors are scalar processor s. Each .... An analogy is the difference between Scalar mathematics scalar and vector arithmetic. A superscalar ... data items concurrently. Superscalar CPU design emphasizes improving the instruction dispatcher accuracy ... important when the number of units increased. While early superscalar CPUs would have two ... all of these units fed with instructions, the performance of the system will suffer. A superscalar ... superscalar, since Instruction pipeline pipelined , multiprocessor or multi core computing multi ... more details
Unreferenced date December 2009 Orphan date November 2006 A shelving buffer is a technique used in computer processors to increase the efficiency of superscalar processors. Background A Superscalar processor allows the execution of a number of instructions simultaneously in the core of the processor itself, although this behavior is not to be confused with a multi processor system. Most modern processors are superscalar. Problems with Data Dependencies Executing instructions in parallel i.e. simultaneously raises problems with data dependencies, meaning that some instructions may be dependent on the results of others, and hence care must be taken to execute in the correct order. Take for example these sequence of instructions r1 r2 r3 br r7 r1 r4 We have a RAW Read After Write data dependency here, meaning that we must wait for instruction 1 to finish before executing instruction 2, as we require the correct value of r1 register 1 . Hence these instruction cannot be executed simultaneously. How it works? With a superscalar processor, the instruction window of the processor fills up with a number of instructions known as the issue rate . Depending on the scheme that the superscalar processor uses to dispatch these instruction from the window to the execution core of the CPU, we may encounter problems if there is a dependency not unlike the one shown above. Consider an instruction window 3 instructions wide, containing i1, i2, i3 instructions 1,2 & 3 . Suppose that i2 is dependent on an instruction that has not yet finished executing, and we cannot execute it yet. Without the use of a shelving buffer, the superscalar processor will execute i1, wait until i2 can be executed and then execute i2 and i3 simultaneously. However with the use of a shelving buffer, the instruction window will be emptied into shelving buffers regardless of contents. The processor will then search for an appropriate number of instructions in the shelving buffers that can be executed in parallel ... more details
Scalar processors represent the simplest class of computer processor s. A scalar processor processes one datum at a time typical data items being integer computer science integer s or floating point number s . ref name ram Advanced Microprocessors and Interfacing by Badri Ram 2000 ISBN 0070434484 page 11 ref , a scalar processor is classified as a SISD processor Single Instructions, Single Data . In a vector processor , by contrast, a single instruction operates simultaneously on multiple data items. called SIMD in Flynn s taxonomy The difference is analogous to the difference between scalar mathematics scalar and Vector geometric vector arithmetic. A superscalar processor, on the other hand, executes more than one instruction during a clock cycle by simultaneously dispatching multiple instructions to redundant functional units on the processor. Each functional unit is not a separate CPU core but an execution resource within a single CPU such as an arithmetic logic unit, a bit shifter, or a multiplier. ref name ram See also Instruction pipeline Parallel computing Superscalar References Reflist Compu hardware stub DEFAULTSORT Scalar Processor Category Central processing unit cs Skal rn procesor de Skalarprozessor es Procesador escalar fr Processeur scalaire ko id Prosesor skalar mk ja pl Procesor skalarny ru uk zh ... more details
Memory Level Parallelism or MLP is a term in computer architecture referring to the ability to have pending multiple memory operations, in particular CPU cache cache misses or translation lookaside buffer misses, at the same time. In a single processor, MLP may be considered a form of ILP, instruction level parallelism . However, ILP is often mixed up with superscalar , the ability to execute more than one instruction at the same time. E.g. a processor such as the Intel Pentium Pro is five way superscalar, with the ability to start executing five different microinstructions in a given cycle, but it can handle four different cache misses for up to 20 different load microinstructions at any time. It is possible to have a machine that is not superscalar but which nevertheless has high MLP. Arguably a machine that has no ILP, which is not superscalar, which executes one instruction at a time in a non pipelined manner, but which performs hardware prefetching not software instruction level prefetching exhibits MLP due to multiple prefetches outstanding but not ILP. This is because there are multiple memory operations outstanding, but not instructions . Instructions are often mixed up with operations. Furthermore, multiprocessor and multithreaded computer systems may be said to exhibit MLP and ILP due to parallelism but not intra thread, single process, ILP and MLP. Often, however, we restrict the terms MLP and ILP to refer to extracting such parallelism from what appears to be non parallel single threaded code. References Enhancing memory level parallelism via recovery free value prediction. H. Zhou and T. M. Conte. Proceedings of the 17th Annual International Conference on Supercomputing, ICS 2003. A Case for MLP Aware Cache Replacement , Moinuddin K. Qureshi, Daniel N. Lynch, Onur Mutlu, Yale N. Patt. Proceedings of the 33rd annual International Symposium on Computer Architecture ISCA , 2006. MLP Aware Runahead Threads n a Simultaneous Multithreading Processor . Craeyn ... more details
execution AMD K6 Superscalar, branch prediction AMD K6 III Branch prediction, speculative execution ... K8 64 bit, integrated memory controller, 16 byte instruction prefetching AMD K10 Superscalar, out ... issue, superscalar ARM Cortex A15 Multicore up to 16 AVR32 AP7 Core AVR32 AP7 7 AVR32 UC3 Core ... g4C5x86 c.html ref Branch prediction Cyrix 6x86 Superscalar, superpipelined, register renaming, speculative ... RISC eSi 3250 5 In order, speculative issue Alpha 21064 EV4 Alpha 21064 Superscalar Alpha 21364 EV7 Alpha 21364 Superscalar design with out of order execution, branch prediction, 4 way SMT, integrated memory controller Alpha 21464 EV8 Alpha 21464 Superscalar design with out of order execution P5 microarchitecture P5 Pentium 5 Superscalar P6 microarchitecture P6 Pentium Pro 14 Speculative execution, Register renaming, superscalar design with out of order execution P6 Pentium II Branch prediction ... 9 SMP PowerPC A2 15 PowerPC e300 4 Superscalar, Branch prediction PowerPC e500 Dual 7 stage Multicore PowerPC e600 3 issue 7 stage Superscalar out of order execution, branch prediction PowerPC e5500 ... 604 6 Superscalar, out of order execution, 6 execution units. SMP support. PowerPC 600 PowerPC 620 PowerPC 620 5 Out of order execution SMP support. PWRficient Superscalar, out of order execution ... SuperH SH2 5 SuperH SH 2A SuperH SH2A 5 Superscalar, Harvard architecture SPARC Superscalar HyperSPARC Superscalar SuperSPARC Superscalar, in order SPARC64 VI VII VII Superscalar, out of order ref http ..., 8 threads per core, SMP, out of order VIA C7 In order execution VIA Nano Isaiah Superscalar out of order ... more details
This is the list of Russian microprocessors , sorted by manufacturer MCST Elbrus 2000 implements VLIW architecture, 300 MHz clock rate , developed by Moscow Center of SPARC Technologies MCST Elbrus S Elbrus 2C MCST R150 MCST R500 MCST R500S MCST R1000 MCST 4R 64 bit, 4 core, 2w in order superscalar, implements SPARC V9 instruction set architecture ISA , 1000 MHz clock rate,developed by Moscow Center of SPARC Technologies MCST ELVEES ELVEES Multicore multicore hybrid of RISC and DSP 1892VM3T, Russian 1892 3 MC 12 1 RISC core 1 DSP core ELcore 14 1892VM2JA, Russian 1892 2 MC 24 1 RISC core 1 DSP ELcore 24 1892VM5JA, Russian 1892 5 0226, 02 1 RISC core 2 DSP cores ELcore 26 1892VM4JA, Russian 1892 4 MC 0226G, 1 RISC core 2 DSP cores ELcore 26 NVCom 01 NVCom 02 in versions 1892VM11YA 1892 11 , NVCom 02 and 1892VM2YA 1892 10 , NVCom 02T Scientific Research Institute of System Development NIISI KOMDIV 32 32 bit, implements the MIPS I instruction set architecture ISA , compatible with R3000 MIPS R3000 , 90 MHz clock rate KOMDIV 64 1890VM5 64 bit, 2way in order superscalar, implements the MIPS IV instruction set architecture ISA , 350 MHz clock rate KOMDIV128 RIO coprocessor some information here elibrary.ru item.asp?id 15257463 no access from non ru NTC Module NeuroMatrix NM6403 NM6404 NMC 64 bit RISC DSP NMRC 32 64 bit RISC List of Russian microprocessors Category Microprocessors ... more details
orphan date September 2010 The HITAC S 3000 is a family of Vector processor vector supercomputer s developed, manufactured and marketed by Hitachi . Announced in the early 1990s, the family succeeded the HITAC S 820 . The S 3000 family comprised the low end and mid range S 3600 models and the high end S 3800 models. Unlike Hitachi s previous generations of supercomputers, the S 3000 family was marketed outside Japan. The S 3600 was an improved version of the S 820 implemented in more modern semiconductor technology. The S 3800 was a new design, differing significantly from the previous generations. It was a parallel vector processor and supported one to four vector processors. In 1994, the S 3000 family was complemented by a MPP machine that used superscalar microprocessors, the SR2001. Hitachi eventually discontinued development of vector supercomputers in favor of this approach. The S 3000 family was replaced in 2000 by the SR8000, making it the last vector supercomputer from Hitachi. Category Supercomputers super compu stub ... more details
In computer engineering , an execution unit also called a functional unit is a part of a central processing unit CPU that performs the operations and calculations called for by the Branch Unit , which receives data from the CPU . It may have its own internal control sequence unit not to be confused with the CPUs main control unit , some processor register register s, and other internal units such as a sub arithmetic logic unit ALU or floating point unit FPU , or some smaller, more specific components. It is commonplace for modern CPUs to have multiple parallel execution units, referred to as scalar or superscalar design. The simplest arrangement is to use one, the bus manager, to manage the memory interface, and the others to perform calculations. Additionally, modern CPUs execution units are usually instruction pipelining pipelined . References reflist no footnotes date August 2010 http www.cs.umass.edu weems CmpSci535 Discussion10.html Execution Unit discussion from the University of Massachusetts Amherst CPU technologies Category Central processing unit Category Computer arithmetic engineering stub de Rechenwerk el es Unidad funcional nl Floating Point Unit ja ... more details
For the Archos Internet Media Tablet devices with the word Media inside please see the article Archos Generation 6 The Archos Generation 7 Gen7 product series is represented by misc Internet Tablets or IT , e.g. the Archos 5 Internet Tablet sometimes abbreviated as Archos 5 IT . This series of tablet computer s developed by the French company Archos that features a resistive touchscreen for video, photo, audio, internet browsing and other multimedia applications. The individual numbering of the distinct models seems up to now to roughly resemble the length of the display diagonal in inches. Archos 5 Internet Tablet In September 2009 Archos announced the Archos 5 Internet Tablet ref http www.archos.com corporate press press releases ARCHOS5 InternetTablet 20090915 en.pdf ref Being an extension of the Gen6 Archos Generation 6 Archos 5 Internet Media Tablet , this Internet Tablet utilizes Google s Android operating system Android mobile operating system . Specification Processor based on ARM Cortex A8, 32 bit, dual issue, superscalar core 800 MHz 256 MB of RAM 4.8 display, 800x480 resolution Video Playback Music Playback Storage 8, 16, 32 or 64 GB Flash memory Micro SD Slot SDHC compatible or 160GB 500GB with 2.5 hard drive ext3 file system Built in GPS navigation device GPS Bluetooth 2.0 FM Radio References Reflist Category Internet tablets ... more details
Infobox CPU name KOMDIV 64 image image size caption produced start 2007 produced end slowest 120 fastest 350 slow unit MHz fast unit MHz fsb slowest fsb fastest fsb slow unit fsb fast unit size from size to soldby designfirm Scientific Research Institute of System Development NIISI manuf1 core1 sock1 pack1 arch MIPS IV microarch numcores 1 The KOMDIV 64 lang ru 64 is a 64 bit microprocessor developed by Scientific Research Institute of System Development NIISI , Russia . It is compatible with PMC Sierra RM7000 . Chips are marked as 1890VM5 lang ru 1890 5 . KOMDIV 64 Highlights implements the MIPS IV instruction set architecture ISA in order, dual issue superscalar 5 stage integer Instruction pipeline pipeline 7 stage floating point Instruction pipeline pipeline 16 KB L1 instruction cache 16 KB L1 data cache 256 KB L2 cache 350 MHz clock rate 26.6 million transistors References http www.niisi.ru otd12.htm http www.niisi.ru otd12.htm In Russian Category Microprocessors List of Russian microprocessors List of Soviet microprocessors ... more details
more or less akin to the basic structure of RISC processors. Superscalar In a more modern context ..., but still feasible, to build a superscalar implementation of a CISC programming model directly the in order superscalar original Intel P5 Pentium and the out of order superscalar Cyrix 6x86 .... The superscalar complexity in the case of modern x86 was solved with dynamically issued and buffered micro operations, i.e. indirect and dynamic superscalar execution the Pentium Pro and AMD K5 are early examples of this. It allows a fairly simple superscalar design to be located after the fairly complex ... store limitations . The Intel P5 microarchitecture P5 Pentium brand Pentium generation was a superscalar ... more details
to collect all desired performance metrics. Moreover, modern superscalar processors schedule ... . AMD s implementation of IBS provides hardware counters for both fetch sampling the front of the superscalar ... more details
. 1992 . http ieeexplore.ieee.org xpls abs all.jsp?arnumber 186696 A high speed superscalar PA RISC ... 229260 A 100 MHz superscalar PA RISC CPU coprocessor chip . 1992 Symposium on VLSI Circuits ... more details
Infobox CPU name ARM Cortex A8 image image size caption produced start produced end slowest fastest slow unit fast unit fsb slowest fsb fastest fsb slow unit fsb fast unit size from size to soldby designfirm ARM Holdings manuf1 TSMC core1 pack1 brand1 arch ARMv7 microarch cpuid code numcores 1 l1cache 32 KB 32 KB l2cache l3cache application The ARM Cortex A8 is a processor core designed by ARM Holdings implementing the ARM architecture ARM v7 instruction set architecture . Compared to the ARM11 core, the Cortex A8 is dual issue superscalar , achieving roughly twice the instructions per cycle instructions executed per clock cycle . Features Key features of the Cortex A8 core are Frequency from 600 MHz to 1 GHz and above Superscalar dual issue microarchitecture ARM architecture Advanced SIMD NEON NEON SIMD instruction set extension optional VFPv3 Floating Point Unit optional Thumb 2 instruction set encoding Jazelle RCT Advanced branch prediction unit with 95 accuracy Integrated level 2 Cache 0 4 MB 2.0 Dhrystone DMIPS MHz Implementations Several system on a chip system on chips SoC have implemented the Cortex A8 core, including AllWinner A1X ALLWINNER A1X Apple A4 Freescale Semiconductor i.MX51 ref Cite web url http www.freescale.com files training doc APF CON T0805 i.MX515.pdf title i.MX51 Applications Processor and Linux Hands on ref Rockchip RK29xx ref Cite web url http www.rock chips.com index.php?do prodnew title RK29XX ref Samsung Exynos Samsung Exynos 3110 Texas Instruments OMAP OMAP3 TI OMAP3 Conexant CX92755 ref Cite web url http www.conexant.com servlets DownloadNewsServlet 03282011 1.pdf title CX97255 ref See also Portal box Electronics ARM architecture List of ARM microprocessor cores List of applications of ARM cores Joint Test Action Group JTAG References reflist External links Official ARM Links http www.arm.com products processors cortex a cortex a8.php ARM Cortex A8 Processor http infocenter.arm.com help topic com.arm.doc.subset.cortexa.a8 i ... more details
In computing , an instruction register IR is the part of a Central processing unit CPU s control unit that stores the instruction currently being executed or decoded. ref John L. Hennessy and David A. Patterson 1990 , Computer Architecture a quantitative approach , Morgan Kaufmann Publishers, Palo Alto, USA, ISBN 1 55860 069 8 ref In simple processors each instruction to be executed is loaded into the instruction register which holds it while it is decoded, prepared and ultimately executed, which can take several steps. More complicated processors use a instruction pipeline pipeline of instruction registers where each stage of the pipeline does part of the decoding, preparation or execution and then passes it to the next stage for its step. Modern processors can even do some of the steps of out of order as decoding on several instructions is done in parallel. Decoding the opcode in the instruction register includes determining the instruction, determining where its operands are in memory, retrieving the operands from memory, allocating processor resources to execute the command in superscalar processors , etc. The output of IR is available to control circuits which generate the timing signals that controls the various processing elements involved in executing the instruction. See also Instruction cache Instruction cycle Instruction unit Instruction scheduling Program status word References Reflist DEFAULTSORT Instruction Register Category Digital registers Compu hardware stub ar es Registro de instrucci n fa ja pl Wska nik instrukcji sv Instruktionsregister ... more details
evolutionary step happened around 2003 where the cores from SH 2 up to SH 4 were getting unified into a superscalar ... of the SH 2 core including a few extra instructions but most importantly moving to a superscalar architecture ... 2A core include Superscalar architecture execution of 2 instructions simultaneously. Harvard ... more details
Unreferenced date December 2009 Keith Diefendorff is a computer architect and veteran in the microprocessor industry. Diefendorff is one of the persons that has led the industry in developing RISC processors, both for embedded system s and superscalar high performance systems. He is one of the main designers of the PowerPC family of processors. Background Keith Diefendorff started at Texas Instruments , designing integrated circuits processors and systems. Later Diefendorff joined Motorola and was the chief architect of a second generation implementation of the Motorola 88000 88000 instruction set architecture , the 88110 . The 88110 was not a commercial success, and when Motorola shifted focus to creating a new RISC architecture with IBM, Diefendorff was assigned as chief architect for the PowerPC . After his work at Motorola Diefendorrf moved to NexGen as director of technical x86 strategy. Diefendorff joined AMD when NexGen was acquired by AMD. From AMD Diefendorrf then moved to Apple Computer Apple as architect for the AltiVec media extensions developed for the PowerPC processors used by Apple. Keith Diefendorff has been working in the embedded processor space. First at the embedded processor IP core company ARC International . After ARC Diefendorrf moved to MIPS Technologies . Diefendorrf has also worked as processor analyst, and editor in chief 1998 2001 for the industry magazine Microprocessor Report . Cquote2 I m not sure competition from any company is Intel s biggest problem. A bigger problem is generating demand for its faster, more profitable desktop chips... Keith Diefendorff on the main threats to Intel DEFAULTSORT Diefendorff, Keith Category Power Architecture ... more details
The instruction unit IU in a central processing unit CPU is responsible for organising for program instructions to be fetched from memory, and executed, in an appropriate order. It is a part of the control unit , which in turn is part of the CPU. In the simplest style of computer architecture , the instruction cycle is very rigid, and runs exactly as specified by the programmer . In the Instruction Fetch part of the cycle, the contents of the program counter PC register are placed on the address bus , and sent to the Computer memory memory unit the memory unit returns the instruction at that address, and it is latched into the Instruction register Instruction Register IR and the contents of the PC are incremented or over written by a new value in the case of a Jump or Branch instruction ready for the next instruction cycle. This becomes a lot more complicated, though, once performance enhancing features are added, such as Instruction pipeline instruction pipeling , out of order execution , and even just the introduction of a simple CPU cache instruction cache . ref John L. Hennessy and David A. Patterson 1990 , Computer Architecture a quantitative approach , Morgan Kaufmann Publishers, Palo Alto, USA, ISBN 1 55860 069 8 ref See also Branch prediction and the Branch prediction buffer Branch target predictor and the Branch target buffer Branch delay slot Instruction scheduling Instruction selection Data dependency or Data hazard Scoreboarding Very long instruction word VLIW Superscalar processor Instruction prefetch buffer and Instruction issue Opcode Analysis of Instruction parallelism, Instruction frequencies, Instruction mix Instruction path length or Instruction count References Reflist DEFAULTSORT Instruction Unit Category Central processing unit microcompu stub ... more details
Jim Kahle is an IBM Fellow and Chief Architect and Director of Technology at the center for Cell microprocessor Cell Technology in Austin, Texas . Mr. Kahle was born in Venezuela where his father worked in the oil business. He received his B.S. degree from Rice University in 1983. He has been working for IBM since the early 1980s on RISC based microprocessors . His work started in physical design tools and is currently concentrated on RISC architecture. With over 20 years of experience of chip design, and about 160 patents, he has been key to defining the Power Architecture and the superscalar microprocessor designs at IBM. He has been on the forefront of developing Multi core processor multicore designs, asymmetric multiprocessing asymmetric multiprocessors and Simultaneous multithreading SMT microarchitecture s. He was the key designer for the POWER1 RIOS processor that launched the RS 6000 family of workstations and servers and one of the founders of the Somerset Design Center, birthplace of the PowerPC architecture, where he was the project manager for the PowerPC 600 PowerPC 603 PowerPC 603 and subsequent designs like the PowerPC 750 . He was also chief architect for the POWER4 core. References http www.research.ibm.com journal rd 494 kahleaut.html Introduction to the Cell multiprocessor Author Bios, IBM http www.power.org devcon 07 speakers Keynote Speakers, Power ArchitectureDevelopers Conference 2007, Power.org http www.computerpoweruser.com editorial article.asp?article articles archive c0702 67c02 67c02.asp&guid Q&A With Jim Kahle, Computer Power User.com http www.crn.com it channel 171203526 Jim Kahle, IT Channel News Persondata Metadata see Wikipedia Persondata . NAME Kahle, James A. ALTERNATIVE NAMES SHORT DESCRIPTION DATE OF BIRTH PLACE OF BIRTH DATE OF DEATH PLACE OF DEATH DEFAULTSORT Kahle, James A. Category Power Architecture Category IBM Fellows Category Rice University alumni Category Living people ... more details
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