Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

USB2 hubs speed with USB1.1 devices

Status
Not open for further replies.

Santa

Member level 4
Joined
May 17, 2001
Messages
71
Helped
2
Reputation
4
Reaction score
1
Trophy points
1,288
Activity points
840
Does anybody have an idea about how USB2.0 hubs manage
multiple USB1.1@12Mbps devices.

I.E., a four channel USB2 hub is connected to four USB1.1 devices working
at 12Mbps. Is the hub able to convert the 4 streams to USB2 and give access
to the simultaneous aggregated 48Mbps bandwith? Or is it (as it looks like for some
hub chips) able to do this only for one USB1.1 stream at a time since it has only
one 480MPS to 12MPS conversion block ? It this case, only a total of 12Mbps is
shared between the four devices.

<Update>
I found that the Cypress hub chip CY7C65640B has four "Transaction Translator"
blocks while most other cheap hub chips have only one. Do you know hub models on the market using
this chip or another incorporating 4 Transaction Translators???

Thanks.
 

mobile-it

Advanced Member level 1
Joined
Apr 24, 2004
Messages
467
Helped
22
Reputation
44
Reaction score
8
Trophy points
1,298
Activity points
3,344
I know Belkin has some (don't know the product ID number :s) Those hubs where used by the USB-IF for certification purposes. (I think it where called tetrahubs or multi -TT or something like that)
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top