[SI-LIST] Re: USB Signal Integrity example
- From: Hithesh <hitheshn@xxxxxxxxx>
- To: "Tang, Linda [Xin Cai]" <LindaXinCai.Tang@xxxxxxxxxx>
- Date: Thu, 13 Sep 2012 00:15:40 +0530
Linda,
Thanks. I found a usb receiver(transceiver) chip that works great - Cypress
HX2VL
A 90ohm resistor between D+/D- also works great.
-Hithesh
On Wed, Sep 12, 2012 at 1:59 PM, Tang, Linda [Xin Cai] <
LindaXinCai.Tang@xxxxxxxxxx> wrote:
> Hi Hithesh,
>
> I am not sure it is work when pi topology termination or T topology
> termination is used.
> Maybe you can try.
>
> Pi topology termination:
> One R1,two R2.
> R1 is across D+ and D-. One R2 is for D+ to gnd, the other R2 is for D- to
> gnd.
> R1=2*Zeven*Zodd/(Zeven-Zodd);
> R2=Zeven.
>
> T topology termination:
> Two R1, one R2, two R1 series connection across D+ and D-, R2 is between
> the node of R1 to R1 and gnd.
> R1=Zodd,
> R2=(Zeven-Zodd)/2
>
> Hope it is useful for you.
>
> Linda
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Hithesh
> Sent: Thursday, August 30, 2012 4:01 AM
> To: SI-List
> Subject: [SI-LIST] Re: USB Signal Integrity example
>
> I tried the following -
> The USB MCU I am using is SAM9G25. The receiver is a 90 ohm res across D+
> and D- and two 5pf caps connected from D+ to gnd and D- to gnd. Series res
> is 22 ohm, TL impedance is 45 ohms.
> It works fine when I select USB Full speed port. But when I select USB High
> speed port, all I get is a continuous DC output
> (at 2.8v and 0v) in hyperlynx.
> Not sure where I am going wrong.
> Any help?
>
> -Hithesh
>
>
>
>
> On Wed, Aug 29, 2012 at 11:33 PM, Hithesh <hitheshn@xxxxxxxxx> wrote:
>
> > I am looking for an example of USB high speed bus signal integrity. I am
> > trying to simulate high speed USB port on a Microcontroller. But what do
> I
> > connect it to?
> >
> > I found some USB OTG host ICs like MAX3421, but no ibis models.
> >
> >
> > -Hithesh
> >
>
>
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