On Fri, 2009-10-02 at 18:25 +0200, Dario Greggio wrote:
> Marcel Birthelmer ha scritto:
> > See for example: http://www.beyondlogic.org/usbnutshell/usb4.htm#Bulk
> 
> I was thinking of 4096 but i'm probably wrong.
> 
> By the way, to Olin et al.: when you say "saturate the bandwitdth i.e. 
> with an audio device", youo mean *that* controller - that is, if the PC 
> has 3-4 controllers (that I guess to match the USB couples of ports you 
> find on the mainboards), one can be overloaded but the others not?

He means each discrete bus. On pretty much all PCs, almost every USB
port is a discrete bus. That said, you do have to sometimes be careful.
Case in point:

many PCs have "media reader" drives at the front (usually an assortment
of flash interfaces: SD, CF, MS, etc) that also supply a few USB ports.
Many of these only connect to the motherboard with a single USB cable,
so although you have a USB port or two, they are actually sharing the
bandwidth with each other, along with the media reader slots.

It'll be nice when USB3 comes on the scene, at the moment the bandwidth
it supplies will satisfy pretty much all current uses of the USB bus.

TTYL

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