I have queried Microchip about these issues, but they haven't gotten back to me.
I would like to investigate this more, but I don't have a 1 GHz logic analyzer. Note, the oscillation occurs with and without a hub. There may be some instability between the PIC32 transceivers and the GL850 chips. I have also found that I spuratically get an oscillation with a 2ns period, which I notice during some transmissions.
At this point I don't seem to have problems with a single hub connected device, but when I connect a EPSON printer, SEIKO printer, and SanDisk flash drive, then usually the flash drive randomly gets disabled when I print stuff to all three devices simultaneously. I found that putting 10 to 25µΩ series resistors on the PIC32 D+ and D- helps even more. I'm also having problems with the GL850G too. The PIC VBUS line is looks good on scope. Any suggestions? The hub can be external or bus powered and the problem persists. The GL850 works with another one of our instruments (Digi NS9360 host) without a problem. I'm connecting printers, drives, and keyboards to the hub. The packets are well within the SOF frame with a 30+us delay after SOF and 100us+ before the next SOF. Configuration via upstream port: about GL850Z found, other GL850 variants are not reprogrammable, but this one has. Hubs are in principle a viable target for BadUSB style attacks. However, plugging in a USB 4-port hub (tried three dif Join Forum.
#Gl850a Usb Hub Driver drivers
The AnywhereUSB software drivers are loaded onto a host PC or server so that USB.ĭownload the latest drivers for your Generic USB Hub to keep your Computer up-to-date. The GL850 randomly disables a port during active communications.ĪnywhereUSB products are network-attached USB hubs that connect USB. USB Hub Port Disable Problem I modified the Microchip USB stack to support a hub (not a trivial task). I'm having a problem with the Genesys Logic GL850 Hub Controller (A Philips ISP1521 Hub Controller works).