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).
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.
==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
ไฟล, usbkey, internals, ไฟล, ประว, ไฟล, หน, าท, ภาพน, การใช, ไฟล, วนกลาง, อม, ลเก, ยวก, บภาพขนาดของต, วอย, างน, กเซล, ความละเอ, ยดอ, กเซล, กเซล, กเซล, ภาพท, ความละเอ, ยดส, งกว, 8206, กเซล, ขนาดไฟล, โลไบต, ชน, ดไมม, image, jpeg, ปภาพหร, อไฟล, เส, ยงน, นฉบ, บอย,. ifl prawtiifl hnathimiphaphni karichiflswnklang khxmulekiywkbphaphkhnadkhxngtwxyangni 625 599 phikesl khwamlaexiydxun 250 240 phikesl 501 480 phikesl 1 000 959 phikesl duphaphthimikhwamlaexiydsungkwa 8206 1 000 959 phikesl khnadifl 490 kiolibt chnidimm image jpeg rupphaphhruxiflesiyngni tnchbbxyuthi khxmmxns raylaexiyddanlang epnkhxkhwamthiaesdngphlcak ifltnchbbinkhxmmxns khxmmxnsepnewbistinokhrngkarsahrbekbrwbrwmsuxesri thi khunsamarthchwyid 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 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 xnuyatihkhdlxk aeckcayaela hruxddaeprexksarniphayitenguxnikhkhxngsyyaxnuyatexksaresrikhxngknu run 1 2 hruxrunid nbcaknithixxkodymulnithisxftaewresri odyimmiswnidhamaekikh immikhxkhwampkhnaaelapkhlng saenakhxngsyyaxnuyatrwmxyuinswnchux syyaxnuyatexksaresrikhxngknuhttp www gnu org copyleft fdl html GFDL GNU Free Documentation License true trueiflnixyuphayitsyyaxnuyat khriexthifkhxmmxns aebbaesdngthima xnuyataebbediywkn 3 0 tnchbbkhunsamarth thicaaebngpn thicathasaena aeckcay aelasngngandngklawtxip thicaeriyberiyngihm thicaddaeplngngandngklaw phayitenguxnikhtxipni aesdngthima khuntxngihekiyrtiecakhxngnganxyangehmaasm odyephimlingkipyngsyyaxnuyat aelarabuhakmikarepliynaeplng khunxacthaechnniidinrupaebbidkidtamkhwr aettxngimichinlksnathiaenawaphuihxnuyatsnbsnunkhunhruxkarichngankhxngkhun xnuyataebbediywkn hakkhunddaeplng epliynrup hruxtxetimnganni khuntxngichsyyaxnuyataebbediywknhruxaebbthiehmuxnkbsyyaxnuyatthiichkbnganniethannpayaesdngsthanalikhsiththinithukephimephuxihepniptamkarepliynaeplngsyyaxnuyatkhxngmulnithiwikimiediy cak GFDL ipyng GFDL khwbkhukb CC BY SA 3 0 http creativecommons org licenses by sa 3 0 CC BY SA 3 0 Creative Commons Attribution Share Alike 3 0 true trueOriginally uploaded by John Fader 17 59 4 December 2004khabrryayodyyxithyephimkhabrryaythrrthdediywephuxkhyaykhwamwaiflnimixairixethmthiaesdngxyuiniflniprakxbdwysthanalikhsiththimilikhsiththisyyaxnuyatGNU Free Documentation License version 1 2 or later xngkvsCreative Commons Attribution ShareAlike 3 0 Unported xngkvs prawtiifl khlikwnthi ewlaephuxduiflthipraktinkhnann wnthi ewlarupyxkhnadphuichkhwamehn pccubn18 23 7 krkdakhm 25511 000 959 490 kiolibt Samulilibetter 20 43 5 emsayn 25511 000 902 219 kiolibt Talgraf777 Information Description Source Date Author Permission other versions 02 32 19 krkdakhm 25481 000 959 490 kiolibt 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 hnathimiphaphni hnatxipni oyngmathiphaphni yuexsbiaeflchidrf karichiflswnklang wikixuntxipniichiflni karichbn af wikipedia org USB flitsdryf karichbn ar wikipedia org سواقة الذاكرة الوميضية karichbn az wikipedia org USB fles kart karichbn ba wikipedia org USB flesh һaҡlagys karichbn bg wikipedia org Flashka karichbn bn wikipedia org 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wikipedia org Memoria USB karichbn he wikipedia org דיסק און קי karichbn hi wikipedia org य ऍसब फ ल श ड र इव dukarichthwolkephimetimkhxngiflnikhxmulekiywkbphaph phaphnimikhxmulephimetim sungswnihymacakklxngdicitxlhruxsaeknenxrthisamarthekbkhxmuldngklawiwrwmkbphaphid thaphaphnithukprbprungaekikhhruxepliynaeplngcakedim khxmulbangxyangcayngkhngimepliynaeplngehmuxnphaphthithukprbprungaekikhnnkarcdwangphaphpktikhwamlaexiydaenwnxn72 dpikhwamlaexiydaenwtng72 dpisxftaewrthiichAdobe Photoshop 7 0aekikhphaphlasud16 51 4 thnwakhm 2547sepssiimidprbethiyb ekhathungcak https th wikipedia org wiki ifl Usbkey internals jpg, wikipedia, วิกิ หนังสือ, หนังสือ, ห้องสมุด,
