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PICList Thread
'[EE]: USB Memory Key'
2001\10\27@161154 by Josh Koffman

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Hi all. Has anyone thought about making a USB Memory Key? IBM makes
them, as I'm sure others do, but at a price of $64CDN for 8MB of memory,
I can't justify it. Basically what it is is a small device that when
plugged into a USB port, the computer recognizes as almost like a disk
drive. It's a neat idea, and I was wondering if it could be done cheaper
than buying from them. I don't really need 8MB of memory, but maybe a
meg or two would be nice. Any ideas?

Josh Koffman

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2001\10\27@184440 by Arthur Brown

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What's wrong with USB SmartMedia/Flash Reader cost #20
SmartMedia Cards 16MB #9 to 128MB at #60

Regards Art

plus you can use them in your camera and Mp3 player..

{Original Message removed}

2001\10\27@224718 by Josh Koffman

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That will work, but the cost is roughly the same...even though you do
get a bit more storage. The size is much larger though. Surely there
must be a more elegant solution. Anyone know how the commercial products
work (ie. what microcontroller, etc)?

Josh Koffman

Arthur Brown wrote:
>
> What's wrong with USB SmartMedia/Flash Reader cost #20
> SmartMedia Cards 16MB #9 to 128MB at #60
>
> Regards Art
>
> plus you can use them in your camera and Mp3 player..
>
> {Original Message removed}

2001\10\27@230323 by Randy Glenn

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Anyone want to take a USB PIC or AVR, and an Atmel DataFlash chip?

-Randy Glenn

Measure twice, cut once, curse, discard.
Repeat.=================================================
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{Original Message removed}

2001\10\27@232846 by Josh Koffman

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That was kind of what I was getting at. Question is, how do you emulate
a drive to the host computer?

Randy Glenn wrote:
{Quote hidden}

> {Original Message removed}

2001\10\28@002600 by Randy Glenn

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"Simply" follow the USB Mass Storage spec. That's what the IBM thing does -
no driver required under WinME/2k+ , Linux, and since a certain version of
MacOS whose coefficient escapes me.

Maybe this would be an application for a Cypress EZ-USB, Ramtron FRAM for
code storage, and a DataFlash. I suggest this because:
       a. I want to be the first one
       b. They've got App notes available on the Mass Storage spec. That makes
writing the code a bit easier
       c. You can get one in the Keyspan USA-19x USB PDA serial adapter, which can
be had at several major computer outlets for about $40USD. Probably a good
development solution (though not for making the final version - too bulky)

-Randy Glenn

Measure twice, cut once, curse, discard.
Repeat.=================================================
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{Original Message removed}

2001\10\29@185227 by Andrew Warren

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Josh Koffman <KILLspamPICLISTKILLspamspammitvma.mit.edu> wrote:

> Has anyone thought about making a USB Memory Key? IBM makes them,
> as I'm sure others do, but at a price of $64CDN for 8MB of memory,
> I can't justify it. Basically what it is is a small device that
> when plugged into a USB port, the computer recognizes as almost
> like a disk drive. It's a neat idea, and I was wondering if it
> could be done cheaper than buying from them. I don't really need
> 8MB of memory, but maybe a meg or two would be nice. Any ideas?

   Josh:

   Windows Me, 2000, and XP (and recent versions of the Mac OS and
   Linux) include support for the USB Mass Storage Class, so you
   don't have to write any PC-side drivers; you just need to build
   a peripheral that's compliant with the Mass Storage Class spec
   and can communicate with a hard drive (or CompactFlash card) via
   ATAPI.

   Cypress Semiconductor, of course, has multiple solutions and
   owns a significant majority of the market for these things.

> Anyone know how the commercial products work (ie. what
> microcontroller, etc)?

   Most use Cypress's EZ-USB FX (full-speed programmable), EZ-USB
   FX2 (high-speed programmable), SLIIRIDE or ISD-200 (full-speed
   non-programmable), or ISD300 (high-speed non-programmable).

   I've never seen a commercial USB Mass Storage device that used
   any other USB microcontrollers (although there are some
   full-speed devices that use custom ASICs).

   -Andrew


=== Andrew Warren -- RemoveMEaiwTakeThisOuTspamcypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
===
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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2001\10\31@125929 by Stephen Holland

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The Q drive from Agate uses a Philips node controller and a SX.

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