Information regarding USBH from documentation

[Srikanth1]

Hi

     I am working on a custom board based on STM32MP157A . For USBH_EHCI:

• In USBH_EHCI_HCCPARAMS register there is a bit called "SFAC" is mentioned in reference manual(RM0436) .Could you please tell us what is the meaning and functionality of the bit.
• In ehci-specification-for-usb(revision 1) the same bit is 64 - bit Addressing Capability

Register from reference manual :

Register from ehci specification document :

 

Regards

Srikanth

[PatrickF]

Hi @Srikanth1 

SFAC mean same than in EHCI documentation: "Sixty Four bits Addressing Capabilities".
As listed, it is at 0 in our implementation.

All USBH EHCI and OHCI registers in STM32MP1x fully comply with their relative specification as goal is to use standard available drivers (Linux or other operating system) which adapt their behavior to the read-only parameters provided.

Regards.