Cyclone V: how to enable USB1 with a ULPI USB PHY (USB3320)?

Hi dpeng,

Let me understand further on your setup:

1. CPEN routed to a VBUS power switch enable (active‑high)
2. RESET# of the USB3320 driven by HPS_GPIO0 (active‑low)

Is that correct?

Could you confirm the checklist below:

1. Confirm the 5 V input to the VBUS power switch is present.
2. Verify the switch enable pin is active-high and connected to CPEN directly.
3. Verify the reference clock to USP3320 (26MHz) is present and stable.
4. Scope the ULPI CLK pin from the PHY (usually 60 MHz output to the MAC).
5. Also check that ULPI I/O voltage rails (1.8 V or 3.3 V) are correct.
6. For OTG micro‑AB, ID grounded: A‑device (host); ID floating: B‑device (peripheral). If the ID pin is floating, the PHY may not try to source VBUS.

Best regards,

Alan