USB FS speed vs USB HS with internal FS Phy with DMA

[Barry Richards]

I have a custom board using a STM32F446RET6 with a SDCard. It is configured

be a mass storage device and use USB_OTG_FS. 

I read another post where someone mentioned the STM32F4 can use USB HS but use

the Internal FS Phy. The advantage to doing this is the USB_OTG_HS can use

DMA.

I can get around 700Kbs to 800Kbs transfer speeds using USB_OTG_FS but would

like to know if changing the configuration to use USB_OTG_HS but with the

Internal FS Phy and DMA gives any noticeable speed increases.

Thanks for any information.

[Tesla DeLorean]

>>I can get around 700Kbs to 800Kbs transfer speeds using USB_OTG_FS but would like to know if changing the configuration to use USB_OTG_HS but with the Internal FS Phy and DMA gives any noticeable speed increases.

No, I think that's about the ceiling on 12Mbps

[Barry Richards]

Ok, I won't bother making changes to test it.

Thank you Clive.