Voltage Identification Digital

Voltage Identification Digital

Voltage Identification Digital or VID is a circuit concept developed to provide the central processing unit (CPU) of a computer with the appropriate supply voltage. Instead of having a power supply unit generate some fixed voltage, the CPU uses a small set of digital signals, the VID lines, to instruct an on-board power converter of the desired voltage level. The switch-mode buck converter then adjusts its output accordingly. The flexibility so obtained makes it possible to reuse the same power supply unit for CPUs with somewhat different nominal supply voltages and to reduce power consumption during idle periods by lowering the supply voltage.

For example, a unit with 5-bit VID would output one of at most 32 distinct output voltages. These voltages are usually (but not always) evenly spaced within a given range. Some of the code words may be reserved for special functions such as shutting down the unit, hence a 5-bit VID unit may have fewer than 32 output voltage levels. How the numerical codes map to supply voltages is typically specified in tables provided by component manufacturers. As of 2008 VID comes in 5-, 6- and 8-bit varieties and is mostly applied to power modules outputting between 0.5V and 3.5V.


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Digital Visual Interface — (DVI) A male DVI D (single link) connector. Type Digital and analog computer video connector Production history …   Wikipedia

  • Digital Visual Interface — (DVI) Conector DVI D macho (single link). Tipo Conector de vídeo de computador digital y análogo Historia de producción …   Wikipedia Español

  • Digital Signal 1 — (DS1, sometimes DS 1) is a T carrier signaling scheme devised by Bell Labs.[1] DS1 is a widely used standard in telecommunications in North America and Japan to transmit voice and data between devices. E1 is used in place of T1 outside North… …   Wikipedia

  • Digital electronics — Main articles: Electronics and Electronic circuit Digital electronics represent signals by discrete bands of analog levels, rather than by a continuous range. All levels within a band represent the same signal state. Relatively small changes to… …   Wikipedia

  • Secure Digital — SDHC redirects here. For the gene, see SDHC (gene). SD, SDHC, SDXC SD (top), miniSD, microSD cards Media type Memory card Capacity SDSC (SD): 1 MB to 2 GB although 4 GB cards are available SDHC: 4 GB to 3 …   Wikipedia

  • Vid — can refer to:* the Sanskrit root VID, meaning to know and related to veda as well as video * a Slavic toponym identifying both a river in Bulgaria called Vit, and Vid, Croatia, a small settlement and archeological site near Metković on the border …   Wikipedia

  • List of battery sizes — 4.5 Volt, D, C, AA, AAA, AAAA, A23, 9 Volt, CR2032 and LR44 batteries. This article lists the sizes and shapes of some common primary and secondary battery types in household and light industrial use. The long history of disposable dry cells… …   Wikipedia

  • Military equipment of Turkey — The military equipment of Turkey includes a wide array of arms, artilleries, large surface vessels, cannons, armored vehicles, mortars, unmanned vehicles and many different equipments. Contents 1 Historical development 1.1 General 1.2 1923 1950 …   Wikipedia

  • Smart card — This article is regarding smart cards that use electrical connectors to transmit data. For smart cards that use radio see contactless smart card Contact type smart cards may have many different contact pad layouts, such as these SIMs A smart card …   Wikipedia

  • telephone — telephoner, n. /tel euh fohn /, n., v., telephoned, telephoning. n. 1. an apparatus, system, or process for transmission of sound or speech to a distant point, esp. by an electric device. v.t. 2. to speak to or summon (a person) by telephone. 3.… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”