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'USB'
1996\11\12@194111 by Gonzalo Palarea

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Chuck McMannis gave away his idea for a PIC project.  I had already given
considerations to building "USB adapters", but I think there's one problem.
the USB runs at 12Mbits, so it will be a bit difficult for pics to be used
in these applications.  Any comments?

1996\11\12@200125 by Bill Marcy

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At 06:44 PM 11/12/96 -0600, you wrote:
>Chuck McMannis gave away his idea for a PIC project.  I had already given
>considerations to building "USB adapters", but I think there's one problem.
>the USB runs at 12Mbits, so it will be a bit difficult for pics to be used
>in these applications.  Any comments?
>
Buffering.

1996\11\12@215040 by Stuart Allman

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At 06:44 PM 11/12/96 -0600, you wrote:
>Chuck McMannis gave away his idea for a PIC project.  I had already given
>considerations to building "USB adapters", but I think there's one problem.
>the USB runs at 12Mbits, so it will be a bit difficult for pics to be used
>in these applications.  Any comments?
>
>

I am currently involved with a USB project, and I KNOW that pics cannot do
USB.  If you look at the spec, especially the OHCI spec, you will see that
you need a special USB engine to do things fast enough.  Even at 20MHz a PIC
won't be able to handle the overhead.
Stuart Allman
spam_OUTstudioTakeThisOuTspamhalcyon.com

1996\11\13@122641 by Chuck McManis

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Stuart Allman wrote:

> I am currently involved with a USB project, and I KNOW that pics cannot do
> USB.  If you look at the spec, especially the OHCI spec, you will see that
> you need a special USB engine to do things fast enough.  Even at 20MHz a PIC
> won't be able to handle the overhead.

I concur that _just_ a PIC would be impractical.

I was under the impression that Intel was producing a 'single chip' USB solution
which did all of the protocol stuff etc. The PIC would supply just enough smarts
to handle setting up the data from the Joy stick(s) to send at perhaps 60 - 100
times per second.

--Chuck

1996\11\13@160952 by Eric Smith

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Chuck McManis <.....cmcmanisKILLspamspam@spam@FREEGATE.NET> wrote:
> I was under the impression that Intel was producing a 'single chip' USB
> solution which did all of the protocol stuff etc. The PIC would supply just
> enough smarts to handle setting up the data from the Joy stick(s) to send
> at perhaps 60 - 100 times per second.

The Intel single chip solution (the 83092) is an 80251 microcontroller with
a USB interface.  While I prefer programming the PIC to the 8051 family any
day, in this case the PIC would definitely be redundant.

Now if microchip would just make a PIC with a USB interface...

Cheers,
Eric

1996\11\13@161557 by Eric Smith

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I wrote:
> The Intel single chip solution (the 83092) is an 80251 microcontroller with

That should have been the 80930 (and the mask ROM version, the 83930).
Sorry about the mistaek.

Eric


'USB'
2005\06\10@064036 by Alan B. Pearce
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>Can I just replace the max 232 with another ic and go USB?
>If yes, what IC ?

The FTDI232B seems to be the highest regarded chip for doing USB to serial
conversion. List member Wouter sells them including as a conversion board,
but if you are wishing to connect between existing buts of equipment then
just getting a serial-USB cable may well be the way to go. Again Wouter has
the cables, but I do not know if his are specifically the FTDI chip version.
In the USA you may wish to look at http://www.rr-cirkits.com/ who sells a
USB-serial cable which I believe is an FTDI one.

Note that whatever you do, it is not just a "drop a different chip in" to
get USB. The chips have different pin outs and totally different packages to
the MAX232 chips. All the USB chips are surface mount.

2005\06\10@084350 by Harold Hallikainen

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Also have a look at the Silicon Labs CP21202.

Harold

>>Can I just replace the max 232 with another ic and go USB?
>>If yes, what IC ?
>
> The FTDI232B seems to be the highest regarded chip for doing USB to serial
> conversion.


--
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