[App_rpt-users] USB Controller requirment

Ken ke2n at cs.com
Tue Feb 16 08:58:27 EST 2010


Subject: Re: [App_rpt-users] USB Controller requirment


The CM108AH data sheet says it supports the "full speed mode" of USB 2.0.
The full-speed mode is 12 Mb/s
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The USB 2.0 specification requires hubs to support high-speed mode. USB 2.0 devices are not required to
support high-speed mode.? 
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There is some app_rpt documentation saying any HUB you use should support 480 Mb/s? - no surprise since this is required by the USB2 spec.

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Ken
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-----Original Message-----
From: pjgjunk at comcast.net
To: 'app_rpt mailing list' <app_rpt-users at qrvc.com>
Sent: Tue, Feb 16, 2010 8:09 am
Subject: [App_rpt-users] USB Controller requirment

Hi all,
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I thought I had read that USB 2.0 was required for the USB FOB, but I cannot fine it anywhere in the documentation.? Both systems I have showed that the FOB is running at 12 MHz.
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Should this be running at 480 MHz?
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# ./usbtree.pl
/: Bus 04.Port 1: Dev 1, Class=root_hub, Drv=uhci_hcd/2p, 12M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Drv=ohci_hcd/2p, 12M
??? |_ Port 2: Dev 2, If 0, Prod=C-Media USB Headphone Set, Class=audio, Drv=snd-usb-audio, 12M
??? |_ Port 2: Dev 2, If 1, Prod=, Class=audio, Drv=snd-usb-audio, 12M
??? |_ Port 2: Dev 2, If 2, Prod=, Class=audio, Drv=snd-usb-audio, 12M
??? |_ Port 2: Dev 2, If 3, Prod=, Class=HID, Drv=usbfs, 12M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Drv=ohci_hcd/3p, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Drv=ehci_hcd/5p, 480M
??? |_ Port 2: Dev 2, If 0, Prod=USB DISK 2.0, Class=stor., Drv=usb-storage, 480M
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I connected a storage device just to prove that the EHCI was functioning.
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Thanks,
Paul
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