USB hosts hubs transceivers Forum Discussions
The data sheet of HX2VL has the following description.
The internal reset is initiated, when there is an unstable power event for silicon’s internal core power (3.3 V ± 10%). Internal reset is released 2.7 µs ± 1.2% after supply reaches power good voltage (2.5V to 2.8V).
After starting up to the normal voltage (3.3V), how many volts does the voltage droop before the POR sequence starts again? Doesn't POR start until it droops to 2.5V?
HX2LP has no description in the datasheet, but is it the same rule?
When powering up HX2VL, a waveform that looks like DP is slightly pulled up is observed.
Why is this happening? Is there any problem with this behavior according to the USB standard?
After powering up HX2VL, sometimes OSC stops oscillating even though reset has not been applied. Can a device actively stop OSC? If so, what are the factors?
I think the internal logic is not working at all because the OSC is stuck. Is this correct?
Are there any time restrictions from power-on to OSC oscillation start?
OSC oscillates after USBHUB (CY7C65642) power is turned on. Is this a problem?
Also, are there any restrictions on the waveform to be input to RESET? For example, is there a rise time specification? I'm wondering if the ramp up rate of the waveform affects the behavior of the HX2VL.
Occasionally one of the connected downstream devices stops working and Error Code 807A3980 is reported to the host. Is this a Cypress error code? If so, what does it mean?Show Less
Customer uses CYUSB3314 on RISC Linux platform
They ask how to generate Test pattern for SI test.
Could you please provide software guide line ?Show Less
I would like to test and verify the CY7C65630-56LTXC part before placing it on the final production board. A development board with a socket for the part would work great. If there is a socket that is also surface mount could be mounted on our board for a test fixture for us. Can anyone suggest a solution.Show Less
What is the voltage value for recognizing High or Low in the following signal, which is the data signal of CY7C65630-56LTXC?
My understanding is that these lines are differential signals, so the Vih/Vil given in the datasheet cannot be specified.
This is my first post, I hope I've outlined the issue properly. Any ideas would be appreciated.
I designed and manufactured a first article order of a Voxl2(companion computer) 3.0 USB hub breakout board. The USB 3.0 hub/Voxl2 was initially sending data. However, at some point the 3.0 bus stopped functioning. Currently only the 2.0 USB works on the hub.
What I've tested:
- 1.2v/3.3v/5v power in the system looks good on a voltmeter and oscilloscope.
- SS TX-/+ & RX-/+ are going to the correct upstream pins from the Voxl2.
- Visual inspection appears to show no issues.
In troubleshooting I use a Linux terminal command called lsusb & dmesg to ascertain the status of the USB. The CYUSB3328 initially came up as USB 3.0 now the chip appears to only be a USB 2.0. This leads me to believe that something on the chip is "broken"
Would anyone have any ideas on how to further troubleshoot this issue or what could be happening?