Differential signaling Elimination of noise by using differential signaling. Advantages[edit] Tolerance of ground offsets[edit] In a system with a differential receiver, desired signals add and noise is subtracted away. Suitability for use with low-voltage electronics[edit] In the electronics industry, and particularly in portable and mobile devices, there is a continuing tendency to lower the supply voltage in order to save power and reduce unwanted emitted radiation. To see why, consider a single-ended digital system with supply voltage . and the low logic level is 0 V. . and the other at 0 V, is . . . Resistance to electromagnetic interference[edit] This advantage is not directly due to differential signaling itself, but to the common practice of transmitting differential signals on balanced lines.[1][2] Single-ended signals are still resistant to interference if the lines are balanced and terminated by a differential amplifier. Comparison with single-ended signaling[edit] Uses[edit] Differential pairs include:
RAMCloud - RAMCloud Project - Confluence What is RAMCloud? RAMCloud is a new class of storage for large-scale datacenter applications. It is a key-value store that keeps all data in DRAM at all times (it is not a cache like memcached). From a practical standpoint, RAMCloud enables a new class of applications that manipulate large data sets very intensively. RAMCloud is also interesting from a research standpoint. The RAMCloud project is based in the Department of Computer Science at Stanford University. Learning About RAMCloud General information about RAMCloud, such as talks and papers. Introductory talk on RAMCloud by John Ousterhout, given at LinkedIn on October 12, 2011.The Case for RAMCloud: an early position paper that discusses the motivation for RAMCloud, the new kinds of applications it may enable, and some of the research issues that will have to be addressed to create a working system. How to Deploy and Use RAMCloud RAMCloud Performance Information for RAMCloud Developers The RAMCloud Test Cluster New Cluster Design Notes
Thunderbolt (interface) Thunderbolt combines PCI Express (PCIe) and DisplayPort (DP) into one serial signal alongside a DC connection for electric power, transmitted over one cable. Up to six peripherals may be supported by one connector through various topologies. A Thunderbolt connector Thunderbolt link connections Intel will provide two types of Thunderbolt controllers, a 2 port type and a 1 port type. Daisy-Chain configuration can connect host with 6 devices(5 devices and 1 displayer) Speed Chart Comparison of USB & Thunderbolt™ HighPoint Technologies,Inc. announces Thunderbolt™ adapter at Computex Taipei, provides the connection ability to SAS/SATA/PCI-E. Thunderbolt was developed by Intel. A single legacy Mini DisplayPort monitor or other device of any kind may be connected directly or at the very end of the chain. The technology was presented as having an initial speed of 10 Gbit/s over plastic optical cables, and promising a final speed of 100 Gbit/s in the future.[15]
Current mode logic differential digital logic family Current mode logic (CML), or source-coupled logic (SCL), is a digital design style used both for logic gates and for board-level digital signalling of digital data . The basic principle of CML is that current from a constant current generator is steered between two alternate paths depending on whether a logic zero or logic one is being represented. Typically, the generator is connected to the two sources of a pair of differential FETs with the two paths being their two drains. Bipolar equivalents operate in the same way, with the output being taken from the collectors of the BJT transistors. As a differential PCB-level interconnect, it is intended to transmit data at speeds between 312.5 Mbit/s and 3.125 Gbit/s across standard printed circuit boards.[1] The transmission is point-to-point, unidirectional, and is usually terminated at the destination with 50 Ω resistors to Vcc on both differential lines. Operation[edit] Ultra low power[edit] See also[edit]
Enterprise PCIe SSD Does PCIe replace SATA and SAS SSDs? Not exactly. PCIe is a high-performance interface with performance targets of 415,000 IOPS and 2 GB/s of bandwidth. PCIe SSDs are intended to augment most server or storage systems by providing several hardware acceleration and caching capabilities to help boost performance. Performance targets vary per system and application. At Micron, we offer our customers choices—our complete SSD portfolio provides the best tool for the job. Is Micron a member of the SSD Small Form Factor Working Group? Yes. What is the secure erase password for the P320h SSD? ffff What type of NAND is used in the P320h drive? The P320h drive uses Micron’s SLC ONFI 2.1 NAND Flash. Can I reduce power consumption on a PCIe drive? Yes, you can reduce the drive’s power consumption to ≤25W by activating the power-limiting feature. In the command-line version (CLI) of RSSDM, perform these steps: The power-limiting feature also can be activated through the RSSDM GUI: Not exactly. No. No. Yes.
Winston Churchill Avenue Winston Churchill Avenue is an arterial road in the British overseas territory of Gibraltar. Description[edit] A time-lapsephotomontage showing multiple stages of a Monarch Airlines Airbus A320 aircraft taking off (moving right-to-left) from Gibraltar Airport, located at the northern end of Gibraltar. Also visible in the center is Winston Churchill Avenue, the only street joining Gibraltar to Spain. References[edit]
Cyclic redundancy check A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents; on retrieval the calculation is repeated, and corrective action can be taken against presumed data corruption if the check values do not match. The CRC was invented by W. Wesley Peterson in 1961; the 32-bit CRC function of Ethernet and many other standards is the work of several researchers and was published during 1975. Introduction[edit] CRCs are based on the theory of cyclic error-correcting codes. A CRC is called an n-bit CRC when its check value is n bits. The simplest error-detection system, the parity bit, is in fact a trivial 1-bit CRC: it uses the generator polynomial x + 1 (two terms), and has the name CRC-1. Application[edit] CRCs and data integrity[edit] Computation of CRC[edit] , where
Micron P320h PCIe SSD (700GB) Review Update: Micron tells us that the P320h doesn't support NVMe, we are digging to understand how Micron's controller differs from the NVMe IDT controller with a similar part number. Well over a year ago Micron announced something unique in a sea of PCIe SSDs that were otherwise nothing more than SATA drives in RAID on a PCIe card. The drive Micron announced was the P320h, featuring a custom ASIC and a native PCIe interface. The vast majority of PCIe SSDs we've looked at thus far feature multiple SATA/SAS SSD controllers with their associated NAND behind a SATA/SAS RAID controller on a PCIe card. These PCIe SSDs basically deliver the performance of a multi-drive SSD RAID-0 on a single card instead of requiring multiple 2.5" bays. There's decent interest in these types of PCIe SSDs simply because of the form factor advantage as many servers these days have moved to slimmer form factors (1U/2U) that don't have all that many 2.5" drive bays.
Aegis Ballistic Missile Defense System The motto in Latin: Custos Custodum Ipsorum means "Guard of the Guardians Themselves" in English The Aegis Ballistic Missile Defense System (Aegis BMD or ABMD)[1] is a United States Department of Defense Missile Defense Agency program developed to provide defense against ballistic missiles. It is part of the United States national missile defense strategy. It enables warships to shoot down enemy ballistic missiles, by expanding the Aegis Combat System with the addition of the AN/SPY-1 radar and Standard missile technologies. The current system uses the Lockheed Martin Aegis Weapon System and the Raytheon RIM-161 Standard Missile 3 (SM-3). History and technical development[edit] Origins[edit] Aegis Ashore deckhouse The current effort to deploy Aegis ballistic missile defense (ABMD) was begun during the mid-1980s as part of President Ronald Reagan's Strategic Defense Initiative (SDI). Later, SDIO worked with the Navy to test the LEAP on the Terrier missile. During the late 1990s, the U.S.
Opto-isolator Schematic diagram of an opto-isolator showing source of light (LED) on the left, dielectric barrier in the center, and sensor (phototransistor) on the right.[note 1] In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is a component that transfers electrical signals between two isolated circuits by using light.[1] Opto-isolators prevent high voltages from affecting the system receiving the signal.[2] Commercially available opto-isolators withstand input-to-output voltages up to 10 kV[3] and voltage transients with speeds up to 10 kV/μs.[4] History[edit] The value of optically coupling a solid state light emitter to a semiconductor detector for the purpose of electrical isolation was recognized in 1963 by Akmenkalns,et al. Operation[edit] Electric isolation[edit] Planar (top) and silicone dome (bottom) layouts - cross-section through a standard dual in-line package. Types of opto-isolators[edit] Resistive opto-isolators[edit]
Who's who in SSD? - Micron Who's who in SSD? - by Zsolt Kerekes, editor - June 2012 Micron sampled its 1st SSD products in early 2008 and made its first appearance in the Top 20 SSD Companies list in Q3 2010. But the company dropped out of the list again in the most recent edition of the top SSD companies (Q1 2012). I spoke to Ed Doller, VP of Enterprise SSD Solutions recently to discuss their enterprise SSD products. I had been following up a chain of SSD contacts within the company - and I was looking forward to finally getting some useful information about their enterprise SSDs. I started by saying that I was surprised that the information which is publicly available on Micron's enterprise SSD web pages - lacks the essential data that any serious designer would need to know in order to decide whether to shortlist Micron as a possible supplier. It wasn't me. Neither Micron nor anyone else can compile a list of who the biggest SSD users are based on traditional sales data. Micron is also in the consumer SSD market.
Ballistic missile Minuteman-III MIRV launch sequence : 1. The missile launches out of its silo by firing its 1st stage boost motor (A). 2. About 60 seconds after launch, the 1st stage drops off and the 2nd stage motor (B) ignites. The missile shroud (E) is ejected. 3. A ballistic missile is a missile (rocket) that follows a ballistic flightpath with the objective of delivering one or more warheads to a predetermined target. History[edit] The first ballistic missile was the A-4,[1] commonly known as the V-2 rocket, developed by Nazi Germany in the 1930s and 1940s under direction of T.J. The R-7 Semyorka was the first ICBM, while the SM-65 Atlas was the first American ICBM. A total of 30 nations have deployed operational ballistic missiles. Side view of Minuteman-III ICBM Flight[edit] A ballistic missile trajectory consists of three parts: the powered flight portion, the free-flight portion which constitutes most of the flight time, and the re-entry phase where the missile re-enters the Earth's atmosphere.