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Reg: Am3352 USB is not working in the High speed mode

Rajesh
Expert 1010 points

Hi ,

I am using AM3352BZCEA30 processor in my design, In this USB0 is terminated in the micro USB connector, We planned to use the USB in the device only mode(ID pin is flot), After Linux booting we found that the  device is detected & working in the Full speed mode(12Mbs) , not switching the High speed mode(480Mbps). What could be the reason behind this scenario ?  .

Pls find the other details about our hardware:

Processor used: AM3352BZCEA30

Main clock frequency:25MHz

USB interface only used in Device mode

Reagards,

Rajesh

  • 0
    TI__Guru**** 393215 points

    Hi,

    What Linux version are you using?

  • 0 in reply to Biser Gatchev-XID
    Expert 1010 points
    Hi,

    Pls find the requested details:
    Linux 3.12.10-ti2013.12.01 #1 Sun Mar 30 20:55:31 CDT 2014 armv7l GNU/Linux
    ti-sdk-am335x-evm-07.00.00.00

    Regards,
    Rajesh
  • 0 in reply to Rajesh
    TI__Guru**** 393215 points
    I have asked the USB experts to help on this.
  • 0
    TI__Mastermind 27720 points
    Did you follow the USB implementation guidelines for this device?

    processors.wiki.ti.com/.../AM335x_Schematic_Checklist

    One possible reason for the behavior you report is poor signal integrity.
  • 0 in reply to -DK-
    Expert 1010 points

    Hi 

    We have followed all the recommendations which is mentioned for the USB Peripheral mode. In addition with that I have used following common mode chocke":DLW21HN900SQ2L & followed by the following ESD diodes: TPD4E05U06DQAR.

    Regards,

    Rajesh

  • 0 in reply to Rajesh
    Expert 1010 points
    I have removed the common mode chocke as well as ESD diode still the same issue is pending.
  • 0 in reply to Rajesh
    Expert 1010 points
    Hi ,

    While connecting with the other host the following error log was observed:
    Jul 28 11:31:42 labadmin-OptiPlex-GX620 kernel: [950854.920023] usb 1-4: new high-speed USB device number 60 using ehci_hcd
    Jul 28 11:31:43 labadmin-OptiPlex-GX620 kernel: [950855.448019] usb 1-4: device not accepting address 60, error -71
    Jul 28 11:31:43 labadmin-OptiPlex-GX620 kernel: [950855.560027] usb 1-4: new high-speed USB device number 61 using ehci_hcd
    Jul 28 11:31:43 labadmin-OptiPlex-GX620 kernel: [950856.088029] usb 1-4: device not accepting address 61, error -71
    Jul 28 11:31:43 labadmin-OptiPlex-GX620 kernel: [950856.200022] usb 1-4: new high-speed USB device number 62 using ehci_hcd
    Jul 28 11:31:44 labadmin-OptiPlex-GX620 kernel: [950856.616020] usb 1-4: device not accepting address 62, error -71
    Jul 28 11:31:44 labadmin-OptiPlex-GX620 kernel: [950856.728024] usb 1-4: new high-speed USB device number 63 using ehci_hcd
    Jul 28 11:31:44 labadmin-OptiPlex-GX620 kernel: [950857.144022] usb 1-4: device not accepting address 63, error -71
    Jul 28 11:31:44 labadmin-OptiPlex-GX620 kernel: [950857.144043] hub 1-0:1.0: unable to enumerate USB device on port 4
    Jul 28 11:31:45 labadmin-OptiPlex-GX620 kernel: [950857.536026] usb 3-2: new full-speed USB device number 68 using uhci_hcd
    Jul 28 11:31:45 labadmin-OptiPlex-GX620 kernel: [950857.675481] usb 3-2: not running at top speed; connect to a high speed hub
    Jul 28 11:31:45 labadmin-OptiPlex-GX620 kernel: [950857.725565] cdc_ether 3-2:1.0: usb0: register 'cdc_ether' at usb-0000:00:1d.1-2, CDC Ethernet Device, 9e:ac:6e:87:bd:55
    Jul 28 11:31:45 labadmin-OptiPlex-GX620 kernel: [950857.767797] ADDRCONF(NETDEV_UP): usb0: link is not ready

    Regards,
    Rajesh
  • 0 in reply to Rajesh
    Expert 1010 points
    Hi All,

    The Isuue is resolved after changing the N value =24 in the MPU core register. Since we have used 25Mhz sysclock where as eval kit has 24MHz.

    Regards,
    Rajesh
  • 0 in reply to Rajesh
    TI__Mastermind 27720 points

    Ahhh, nice catch! The wrong input clock frequency would certainly cause problems in HS mode. Thanks for updating your thread with your findings.