two USB slave:Interface

[Davy]

I want to transfer data stream from one USB slave chip to another USB
slave chip(single direction).
Shall I interface a hub chip between them? Or can I interface them
without a hub chip?
May you please recommend some references?

Any suggestions will be appreciated!

Best regards,
Davy

 

refer to the USB spec, USB device only reply the command of USB host.
so only can use host chip or OTG chip.

 

[Tim Wescott]

Davy wrote:

I want to transfer data stream from one USB slave chip to another USB
slave chip(single direction).
Shall I interface a hub chip between them? Or can I interface them
without a hub chip?
May you please recommend some references?

Any suggestions will be appreciated!

Best regards,
Davy

You need a USB master, and it needs to manage the transfer from one

slave to the other.

If you're early enough in the project keep in mind that IEEE-1394 is
peer to peer. It's harder to build a 1394 peripheral, but you can do
much more with it when you're done.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[Davy]

Hi,

Thank you all for your help?

I have two more problem:

For the "host" scheme, shall I have two chip one hub chip and one
master chip to do the transfer?

For the "USB OTG" scheme, is the OTG a matured technology and is there
any producer provide the OTG chip?

Best regards,
Davy

 

[PeteS]

Between the two slaves (upstream ports as they are known in the spec)
you need a device capable of acting as a host for each one. There are a
number of hosts out there.

Cypress makes a nice one - CY7C67200/CY7C67300
http://www.cypress.com/portal/server.pt?space=CommunityPage&control=SetCommunity&CommunityID=209&PageID=215&gid=9&fid=10&category=All&showall=false


OTG is fairly mature. You would have to replace your slaves (well, at
least one of them) with an OTG device. If that's not possible, then use
the multi host device.

Note that Philips makes hosts as well (ISP1362, for example), but I
(and others) have had trouble making it work - seems to be the software
stack, but we're really not sure. The ISP1362 has a host and a OTG
port.

Cheers

PeteS