USB flash drives or usually known as Pen Drives are famous
detachable storage media with capacities up to 256GB. They are premiere to
other traditional storage devices, such as floppy disks or CDs, due to the fact
they're faster, smaller, and have an extended lifespan.
The flash drive's internal circuitry is powered by means of
the pc to do its activity. They have a integrated USB interface for communique
with a pc. The crucial elements of a flash pressure are a USB connector, a
crystal oscillator, memory chips, and a controller to interface with a PC. The
flash pressure used right here has a capacity of four GB.
Internal structure
The inner shape of USB showing the printed circuit board and
circuit elements.
The photograph above shows a PCB with schematics and a USB
connector. The circuit is blanketed inner a pair of plastic cases (joined
collectively with mechanical hooks) that may be carried in a pocket or on a key
chain. The USB connector is blanketed via retracting into the case or by means
of last a detachable cover. There are two chips, one is a USB controller and
the other is a flash memory chip, which might be mentioned in detail later in
this newsletter.
Controller
The SK6211 IC proven in the picture above is a controller
that enables communication among a PC/computer and the flash reminiscence
(EEPROM) of a flash force. It is fully compliant with USB 2.0 protocols and the
USB Mass Storage Class V1.Zero specification. Devices like a reminiscence card,
hard pressure, flash drive, and so forth. With a huge storage potential are
blanketed inside the class of mass garage gadgets. To transfer facts with
gadgets that fall into this category, USB has described a set of protocols. The
operating gadget affords integrated libraries to work with such gadgets, hence
disposing of the need to put in external drivers earlier than the use of those
devices. This controller chip can interface with all styles of NAND EEPROM.
Reminiscence chip-1
The 2nd chip, shown in the picture above, is a NAND-kind
flash reminiscence with rapid examine, write, and erase cycles. Data is stored
in EEPROM memory cells called "Floating Gate Transistors", a
conventional Metal Oxide Field Effect Transistor (M0SFET) which includes three
terminals: Source, Gate and Drain. The capability of this memory is 2 GB. On
the other facet of the PCB is some other comparable chip with a 2GB potential,
bringing the whole potential of the flash force to 4GB.
The photograph above indicates the alternative facet of the
PCB. He soldered on a second reminiscence chip, a crystal oscillator, and a
number of floor-mount components had to make the flash force paintings.