Ficheiro:Usbkey_internals.jpg
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The internal components of a typical keydrive
This photograph shows both sides of the printed circuit board inside a typical keydrive (Seitec USB-BAR USB 1.1circa 2004), in this case an inexpensive 64 Mbyte USB2.0 device. The plastic clamshell case has been removed.
In practice the keydrive consists of only two significant components. The first is the flash memory part (item 4 in the diagram), a generic device that might as easily be found in a digital camera's memory card. The second (item 2 in the diagram) is a device which implements the USB networking and mass-storage interface, and which knows how to make a chunk of generic flash memory appear like a normal disk drive. The high degree of integration in this latter part makes small, inexpensive keydrives possible.
The parts of the device are as follows:
- A male type-A USB connector.
- An Ours Technology Inc. OTi-2168 USB 2.0 mass storage controller. This implements the USB 2.0 host controller, and provides a seamless linear interface to block-oriented serial flash devices, while hiding the complexities of block-orientation, block erasure, and wear balancing. It contains a small RISC microprocessor and a small amount of ROM and RAM. This communicates with the Hynix device over an 8-line unified address/data bus. This version is a 7x7mm 48-pin LQFP (Low Profile Quad Flat Pack) surface-mount device (info).
- JP1 and JP2: two unpopulated 10-pin connectors, used for testing during the keydrive's manufacture.
- A Hynix Semiconductor HY27USxx121M series NAND Flash memory device, featuring 4096 independently erasable blocks each providing 16 Kbytes of storage, yielding a total of 64 Mbytes of usable storage. The version used in this keydrive is a 20x12mm 48-pin TSOP1 (Thin Small Outline Package) surface-mount package (datasheet) cópia arquivada at the Wayback Machine.
- An SKC Shin Chang Electronics 12.000 MHz crystal oscillator (XTAL). The OTi device runs the output of this through a phase-locked loop to produce its main 12 MHz clock signal.
- A single yellow light-emitting diode (run from a pin on the OTi device) which flashes to indicate activity.
- A simple two-position switch, used to indicate whether the device should be in "write-protect" mode. It is shown here in the make position, indicating write-protect is off.
- An unpopulated space for a second TSOP1 memory package. The OTi device is capable of driving up to eight such devices. Having this second space allows the manufacturer to choose (generally on a cost basis) whether to use one or two TSOP flash parts.
Surrounding these main components are a number of tiny surface-mount resistors (many of them serving as pull-ups) and capacitors.
For a closeup of an area of this keydrive, see this image.
Information and licensing
Photographs taken and annotated by John Fader in December 2004 using Adobe Photoshop and Inkscape. This image is (C) Copyright 2004 and (with the exception of its use under the GFDL) all rights are reserved.
É concedida permissão para copiar, distribuir e/ou modificar este documento nos termos da Licença de Documentação Livre GNU, versão 1.2 ou qualquer versão posterior publicada pela Free Software Foundation; sem Secções Invariantes, sem textos de Capa e sem textos de Contra-Capa. É incluída uma cópia da licença na secção intitulada GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
A utilização deste ficheiro é regulada nos termos da licença Creative Commons - Atribuição-CompartilhaIgual 3.0 Não Adaptada. | ||
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Esta marca de licenciamento foi adicionada a este ficheiro durante a atualização da licença GFDL.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
Originally uploaded by John Fader 17:59, 4 December 2004
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19h32min de 18 de julho de 2005 | 1 000 × 959 (490 kB) | Solipsist~commonswiki | ==The internal components of a typical keydrive== This photograph shows both sides of the printed circuit board inside a typical keydrive (circa 2004), in this case an inexpensive 64 Mbyte USB2.0 device. The plastic clamshell case has been remov |
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Orientação | Normal |
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Resolução horizontal | 72 ppp |
Resolução vertical | 72 ppp |
Software utilizado | Adobe Photoshop 7.0 |
Data e hora de modificação do ficheiro | 16h51min de 4 de dezembro de 2004 |
Espaço de cores | Cor não calibrada |