Alan,
Thanks for the clarifications!
I really appreciate it.
Thanks..
From: Alan Stern <[EMAIL PROTECTED]>
To: abcd efgh <[EMAIL PROTECTED]>
CC: linux-usb-users@lists.sourceforge.net
Subject: Re: [Linux-usb-users] Confused with wHubCharacteristics.
Date: Mon, 14 Mar 2005 15:19:44 -0
On Mon, 14 Mar 2005, abcd efgh wrote:
> So, to be USB2.0 compliant:
> In wHubCharacteristics, D1 D0 should never be 1X. I will see what I can do
> with the hardware.
>
> Will there be any problem, if I just do it in driver (as I said earlier - by
> modifying wHubCharacteristics) instead of modi
Hello,
No, power switching isn't necessary. It even says so in the spec,
section 11.11 (which you should read in full):
Self-powered hubs may have power switches that control delivery of
power downstream facing ports but it is not required. Bus-powered
hubs are required to
On Sat, 12 Mar 2005, abcd efgh wrote:
> Alan,
>
> Thanks for educating me!
>
> I thought the driver deciphers it by reading a logic circuit that says what
> is available. I read the data sheet of ISP1521BE (USB hub controller that we
> use), and it looks like you have to play with the pins to
>
To: abcd efgh <[EMAIL PROTECTED]>
CC: linux-usb-users@lists.sourceforge.net
Subject: Re: [Linux-usb-users] Confused with wHubCharacteristics.
Date: Fri, 11 Mar 2005 22:14:37 -0500 (EST)
On Fri, 11 Mar 2005, abcd efgh wrote:
> >Lack of power switching implies that the hub follows the
On Fri, 11 Mar 2005, Alan Stern wrote:
> > How exactly is this value obtained from the device? I know it's not stored
> > in the device. Is it related to the problems with the power supply to the
> > board?
>
> The value _is_ obtained from the device.
Sorry, I meant that the value _is_ stored
On Fri, 11 Mar 2005, abcd efgh wrote:
> >Lack of power switching implies that the hub follows the USB 1.0 standard,
> >but since it is high speed it actually follows the USB 2.0 standard.
> >Also, overcurrent protection may be omitted only for bus-powered hubs.
> >Clearly the value is wrong.
>
>
> I went into the driver, and came to know that this hub was returning
(1011
> 0010) as wHubCharacteristics, and pPwrOn2PwrGood as 0. This hub is a
powered
> hub (doesn't draw power from bus), and high speed. I only use all high
> speed, so I guess TT's do not come into picture.
Lack of power sw
On Fri, 11 Mar 2005, abcd efgh wrote:
> Hello,
>
> Recently we moved to FC3 (2.6.10) from RH9 (2.4.23). I have a board with a
> USB hub (Philips ISP1521 BE) with some chips behind it. In 2.6.10, USB
> driver doesn't recognize the chips behind the controller. But, the same
> board works fine wi
Hello,
Recently we moved to FC3 (2.6.10) from RH9 (2.4.23). I have a board with a
USB hub (Philips ISP1521 BE) with some chips behind it. In 2.6.10, USB
driver doesn't recognize the chips behind the controller. But, the same
board works fine with 2.4.23.
I went into the driver, and came to know
10 matches
Mail list logo
