[SI-LIST] Re: usb2.0 eye template
- From: "PRAJIT S NAIR" <prajitsnair@xxxxxxxxx>
- To: santhosh.etavalath@xxxxxxxxx
- Date: Sat, 21 Apr 2007 11:59:23 +0900
Hello Santosh
As you know there are three types of cables in USB spec.. Standard
detachable cable, high/full speed captive cable and low speed captive cable.
Captive means attached to some device i.e hardwired to the device.
From your description it seems that you are having captive cable connection.
Therefore in my opinion you should use captive cable templates for your
testing.
Check USB developer forum website. Some good presentations are there....
- Mr.Kosta Koeman , "USB 2.0 Compliance and Tools".
- Mr.Jon Lueker, "USB 2.0 Test Modes and their application"
With Best Regards
Prajit S Nair
On 4/21/07, santhosh.etavalath@xxxxxxxxx <santhosh.etavalath@xxxxxxxxx>
wrote:
>
> Hi,
> I have a doubt regarding the templates given for the eye masks at
> differents locations of USB high speed signalling.
> In the USB2.0 spec they mainly mentioned about 4 templates to be used
> while checking the signals.
> If I have a USB interface between the host and connector on the board (a
> USB device like mem stick or floppy drive will be connected to it) which
> template I should be looking at for receiver side and transmitter side
> waveforms?
> Should I consider the captive cable templates?
>
> Same thing with a USB interface between host and device where both are
> separate chips on the board, which templates to be looked at for tx and rx
> side waveforms?
>
> Is there any specific eye mask fand UI limit for the USB1.1 signals at
> both reciever and transmitter side waveforms, if then what is the values.
>
> Regards
> Santhosh
>
>
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