MISTRAL OMAPEVM (REV G) uses ISP1507 PHY on OTG port and USB3220 on HOST port,
my new design will use AM/DM3715 , Wince6.0 and android OS will be selected.
if can I use ISP1507 or USB3320 PHY for both OTG and HOST ports so to reduce the component type? Is there any risk?
I f can I use PMIC PHY on OTG port instead of using ISP1507?
Some customers have been using usb PHY inside PMIC so you can also use it for OTG port and for HOST port recommended PHY is TUSB1210.
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Our AM3517/05 running at 3.3V VDDIO so TUSB1210 with 1.8V only ULPI interface does not suit well.
Do you have any alternative PHY that you can recommend?
The USB OTG subsystem used in AM37x/DM37x devices will operate with any I/O voltage compatible 8-bit SDR ULPI PHY because it supports the clock output mode which is a required mode of operation defined in the ULPI specification.
The USB OTG subsystem used in AM35x devices does not require an external ULPI PHY because it contains an internal USB PHY.
The USB host subsystem used in AM37x/DM37x and AM35x devices require an I/O voltage compatible 8-bit SDR ULPI PHY that supports the optional clock input mode defined in the ULPI specification. Not may ULPI PHYs support clock input mode since this is an optional mode of operation. The SMSC USB3320 and TI TUSB1210 are the most commonly used ULPI PHYs with the USB host subsystem.
The SMSC USB3320 supports 1.8/3.3 volt I/O and the optional clock input mode so it can be used with both the USB host subsystem and USB OTG subsystem in any of the above mentioned devices.
The TUSB1210 does not support 3.3 volt I/O but it does support the optional clock input mode. It can be used with the AM37x/DM37x USB OTG subsystem and USB host subsystem, but can not be used with the AM35x USB host subsystem with I/Os operating at 3.3 volts.
The ISP1507 ULPI only operates at 1.8 volts and does not support the optional clock input mode. It can be used with the AM37x/DM37x USB OTG subsystem, but can not be used with the AM37x/DM37x or AM35x USB host subsystem.
We need to use USB OTG for one device port. USB3320 supports 1.8/3.3 VDDIO and input clocking mode but there is a "Advisory 1.1.33 HSUSB Interoperability Issue with SMSC USB3320 PHY" in AM35x Errata that worried us. Do you have any more details on that bug? It seems the suspense mode is not from user setting so that we can not prevent it to go to suspense mode then get lock up.
Thank you very much.
You can try changing the usbhost linux driver at drivers/usb/host/ehci-omap.c for not switching off the clock during suspend and see if that helps. There are other SYSCONFIG register for USBHOST and you can configure for NOIDLE and NOSTDBY to test further.
Do you have any procedure/way to duplicate that issue? I checked connect/disconnect several times with USB Flash but have not found any issue yet. In what condition the USB3220 goes to suspend sequence? I need to duplicate the issue first to see if "preventing switching off the clock during suspend mode" works.
The ISP1507 operates with I/O between 1.65 V and 3.6 V for the A, B, C and D variants. Only the E and F variant operate between 1.65 V and 1.95 V.
I don't understand why the Mistral AM/DM37x EVM uses both the ISP1507B (for OTG) and the USB3320 (for host). Why did they not use the USB3320 for both interfaces, since the USB3320 is OTG compliant?
If I want to use the USB host controller on the AM35x, I need to run the VDDSHV voltage at 1.8V due to the lack of USB transceivers that have the combination of 3.3V ULPI interface and clock input mode. If I run VDDSHV on the AM35x at 1.8V, how do I boot with a removable SD card from MMC1?
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