TUSB4041I: unable to connect to downstream side

Shinichi Inoue

Guru 21961 points

Part Number: TUSB4041I

Dear Specialists,

My customer is evaluating TUSB4041B and encountered a problem not to connect to downstream side.

I would be grateful if you could advise.

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I am using default setting.

It is connected to upstream side(CPU) and can be recognize, but it can't achieve the data communication to downstream.

Is there a possibility of the issue, SMBUSz(pin7):1 and Automatic mode(pin13):0

Also could you please advise the other possible causes.

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I appreciate your great help in advance.

Best regards,

Shinichi

over 7 years ago

0 Shinichi Inoue over 7 years ago

Guru 21961 points

Hi someone in charge,

The customer sent additional information.

Could you please see these and advise.

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I confirmed the condition of TUSB4041I from CPU(RZ/G1E Renesas).

USB device class is FFh(255), please see attached file.

If the data is 09h, it should work general driver.

According to the engineer of Renesas, in case of FF, it seems to need a specific driver.

I confirmed TUSB4041I should work with general driver by other post, these information are contradictory.

e2e.ti.com/.../2422195

So could I confirm again.

Is it possible to use general driver TUSB4041I

---

I appreciate your great help.

Best regards,

Shinichi

Fullscreen USB4041I power up issue .txt Download

��Evaluation board
USB HubIC resister setting

Bus 002 Device 002: ID 0451:80ff Texas Instruments, Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          255 Vendor Specific Class
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0451 Texas Instruments, Inc.
  idProduct          0x80ff 
  bcdDevice            1.01
  iManufacturer           0 
  iProduct                0 
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           18
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass          255 Vendor Specific Class
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0001
  Self Powered

0 JMMN over 7 years ago in reply to Shinichi Inoue

TI__Guru 60870 points

Hi Shinichi,

If SMBUSz is held low or an unprogrammed EEPROM is attached to the TUSB4041, the TUSB4041 will report as a programming endpoint (FF). Please remove the pull down on SMBUSz or program / remove the unprogrammed EEPROM and the hub will work as expected.

Regards,

JMMN

0 Shinichi Inoue over 7 years ago in reply to JMMN

Guru 21961 points

Hi JMMN,

Thank you for your reply.

I'll share your answer with the customer and make him confirm.

If he has an additional question, I consult you again.

I appreciate your great help.

Best regards,
Shinichi

Interface

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TUSB4041I: unable to connect to downstream side