Re: An interesting chip for USB applications

From: André Fachat (
Date: 2006-10-08 17:08:06

Hi Marko (and others),

do you have experiences with this USB chip Cypress SL811HS?
(Is this what is mentioned as "EZ-USB" below?)
As far as I see there are some CBM projects underway with this
chip, e.g. here
A first glance at the specs seem to make it easily useable,
but then I do not have any ideas about higher level USB 
protocols.... (I am, however, actually planning a prototype board
for my CS/A computer with it)

Considering CPU+USB combinations - I found a place with 6502 with
builtin USB:
(Don't know how reliable this source is, though)


Von: "Marko Mäkelä" <>
Betreff: Re: An interesting chip for USB applications

> Hi Wolfgang,
> On Sat, Oct 07, 2006 at 11:38:44PM +0200, Wolfgang Moser wrote:
> > Hello Marko,
> > 
> > Marko Mäkelä schrieb:
> > >A friend of mine recently told me about the MAX3421E from Maxim
> > ><>.

> Those chips you mention use their own proprietary USB protocols and
> need special drivers on the PC.  The MAX3421E (as well as its precursor
> MAX3420E) allow you to define your own protocol over the USB by
> controlling the chip over the SPI bus.  I would guess that the two most

> > At first there's the Cypress EZ-USB series with the FX
> > and FX2 µCs.
> The Keyspan usb-to-serial converters have been built using that chip.

> > Secondly there are Microchips PICs with builtin USB cores
> > 
> >
> >
> > 
> > I heard about some Cons regarding the USB implementation,
> > but that may be bad rumors only from people not having
> > fully understood the specs or the concepts.
> That would be understandable, as USB is a very complex standard.

> I think that you are slightly mistaken about the Maxim chip.
> It requires quite a bit of USB programming knowledge,
> although it seems to handle some low-level stuff, such as
> retransmissions.  I do not have any experience in low-level
> USB programming yet, though.

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