Re: USB Host Controller no PCD interrupt and CCS and CSC update on the device disconnect

2015-05-28 Thread Alan Stern
On Thu, 28 May 2015, Rong Wang wrote: > Thanks for this Device side information. But there's one thing I'm > still not quite sure > What's the behavior of the USB device when the VBUS is always present > while the D+/D- differential signal amplitude exceeds the > disconnection threshold (525 mV)?

Re: USB Host Controller no PCD interrupt and CCS and CSC update on the device disconnect

2015-05-27 Thread Rong Wang
Hi Alan, On Tue, May 26, 2015 at 11:32 PM, Alan Stern wrote: > On Tue, 26 May 2015, Rong Wang wrote: > >> > It seems that your customer wants to change the hardware, not the >> > software. >> >> Yes. We plan to do a hardware modification. But we want to make as little >> change as possible. So we

Re: USB Host Controller no PCD interrupt and CCS and CSC update on the device disconnect

2015-05-26 Thread Alan Stern
On Tue, 26 May 2015, Rong Wang wrote: > > It seems that your customer wants to change the hardware, not the > > software. > > Yes. We plan to do a hardware modification. But we want to make as little > change as possible. So we plan to make the internal signal HostDisconnect > , which is sent fro

Re: USB Host Controller no PCD interrupt and CCS and CSC update on the device disconnect

2015-05-25 Thread Rong Wang
Hi Alan, On Mon, May 25, 2015 at 10:16 PM, Alan Stern wrote: > On Mon, 25 May 2015, Rong Wang wrote: > >> On Fri, May 22, 2015 at 10:06 PM, Alan Stern >> wrote: >> > On Fri, 22 May 2015, Rong Wang wrote: >> > >> >> Hi, >> >> >> >> We have one USB 2.0 Controller on an ARM SoC, with internal PHY

Re: USB Host Controller no PCD interrupt and CCS and CSC update on the device disconnect

2015-05-25 Thread Alan Stern
On Mon, 25 May 2015, Rong Wang wrote: > On Fri, May 22, 2015 at 10:06 PM, Alan Stern > wrote: > > On Fri, 22 May 2015, Rong Wang wrote: > > > >> Hi, > >> > >> We have one USB 2.0 Controller on an ARM SoC, with internal PHY > >> confirming to UTMI. > >> The PHY would detect unexpected disconnect

Re: USB Host Controller no PCD interrupt and CCS and CSC update on the device disconnect

2015-05-24 Thread Rong Wang
On Fri, May 22, 2015 at 10:06 PM, Alan Stern wrote: > On Fri, 22 May 2015, Rong Wang wrote: > >> Hi, >> >> We have one USB 2.0 Controller on an ARM SoC, with internal PHY >> confirming to UTMI. >> The PHY would detect unexpected disconnect (amplitude of the >> differential envelop still < 625 mV)

Re: USB Host Controller no PCD interrupt and CCS and CSC update on the device disconnect

2015-05-22 Thread Alan Stern
On Fri, 22 May 2015, Rong Wang wrote: > Hi, > > We have one USB 2.0 Controller on an ARM SoC, with internal PHY > confirming to UTMI. > The PHY would detect unexpected disconnect (amplitude of the > differential envelop still < 625 mV) > and assert the HostDisconnect signal to the Controller to i

USB Host Controller no PCD interrupt and CCS and CSC update on the device disconnect

2015-05-22 Thread Rong Wang
Hi, We have one USB 2.0 Controller on an ARM SoC, with internal PHY confirming to UTMI. The PHY would detect unexpected disconnect (amplitude of the differential envelop still < 625 mV) and assert the HostDisconnect signal to the Controller to indicate a disconnection event. When the HostDisconnec