I've ordered a custom planned PCB which contains an FT2232D chip. Circuit looks like this:
VCC and USB_VCC are connected on another page. GND and USB_GND are connected on another page.
Datasheet of FT2232D: http://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT2232D.pdf Datasheet of EEPROM: http://lomex.hu/pdf/(stm)_m93c46-m93c86.pdf
Although it seems starting upon connecting, no further steps could be done:
[23980.186603] usb 5-1: new full-speed USB device number 91 using xhci_hcd [23980.277845] usb 5-1: Device not responding to set address. [23980.569101] usb 5-1: Device not responding to set address. [23980.769169] usb 5-1: device not accepting address 91, error -71 [23980.880898] hub 5-0:1.0: unable to enumerate USB device on port 1
I'm using self powered configuration, so the chip gets its power from USB port directly. A 6 MHz XTAL was applied, according to datasheet. And I also applied an EEPROM (although it's not a must I think).
On Windows I got unknown device and then Windows disables it because thinks it works wrong. FT_Prog doesn't recognize it either.
On Linux the dmesg shows lines above. Device is not responding.
How could I move on? Do you guys seen anything like this?