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Hi,
We are develop a USB device and ULPI interface is used. We tested our RTL in FPGA and using ULPI PHY (TUSB1210).
But we found high-speed detection handshake is not successful. When USB device send TX CMD (84 54) and TX CMD (40 00) to ULPI PHY to let it to send Chirp K,
then, USB device waits for Chirp K/J/K/J/K/J from usb host, but there is no Chirp K/J/K/J/K/J received.
The internal signal is shown as following figure(TX CMD (84 54) and TX CMD (40 00) are send to TUSB1210):
And we tested the signal of D+/D- after plugging USB cable to TSUB1210. It shows that signals keep toggling and this toggling is driven by TUSB1210.
The signals of D+/D- is shown in following figures:
From above, the amplitude of D- is larger than D+, this is a kind of strange.
So, do you have any suggestion for above testing result? I am looking forward to you reply.
Thanks and Best Regards,
Long
Hi Brian,
FPGA is XILINX VCU118.
Schematics is as following:
Please help to review and comment.
Could you also offer your e-mail?
Thanks!
Long
