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TUSB1046A-DCI: loopback mode

Jeff YANG
Mastermind 9265 points

Part Number: TUSB1046A-DCI

Hi,

We are currently conducting compliance certification and have encountered the following issue: If the device fails to enter loopback mode, could it be related to the EQ settings of the TUSB1046A? Or what parameters should be adjusted to successfully enter loopback mode for testing?

Port No.

UFP

H1P1

Connector

Type-C

Type-C

Test Item

Result

Remark

Result

Remark

USB 3.2 Tx Phy

Gen 1 Tx

Pass

  

Pass

  

Gen 2 Tx

Pass

  

Pass

  

USB 3.2 Rx Phy

Gen 1 Rx

Pass

  

Fail

1. Long Channel can't enter Loopback Mode

Gen 2 Rx

Fail

L0, L1_15MHz Fail

Fail

L1_50MHz, 30MHz, 15MHz Fail

 

image.png

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thanks!

Jeff

  • 0
    TI__Guru 59395 points

    Hi Jeff,

    Yes, EQ settings could affect the performance of the RX Compliance testing, such as getting into loopback mode.

    Could you send over the current EQ settings being used? Does the customer know the loss in their system between the host and the redriver, and the redriver and the connector? Did they factor this into selecting their EQ settings?

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    Mastermind 9265 points

    Hi Ryan,

    Here is the EQ setting. Customer seems don't know the total loss, if don'n know the total loss, we just can try all EQ setting, right? thanks!

    Fullscreen 0x44 i2c.txt Download 
    write to 0x6A nak
write to 0x67 ack data: 0x01 0x00 
write to 0x44 ack data: 0x0A 0x11 
write to 0x44 ack data: 0x10 0x11 
write to 0x44 ack data: 0x11 0x11 
write to 0x44 ack data: 0x13 0x10 
write to 0x44 ack data: 0x20 0x77 
write to 0x44 ack data: 0x21 0x07 
write to 0x10 ack data: 0x55 
read to 0x10 ack data: 0x00
write to 0x10 ack data: 0x09 0x00 
write to 0x10 ack data: 0x0A 0x18 
write to 0x10 ack data: 0x0B 0x00 
write to 0x10 ack data: 0x0C 0x00 
write to 0x10 ack data: 0x0D 0x00 
write to 0x10 ack data: 0x0E 0x00 
write to 0x10 ack data: 0x0F 0x00 
write to 0x10 ack data: 0x10 0x00 
write to 0x10 ack data: 0x11 0x00 
write to 0x10 ack data: 0x12 0xAA 
write to 0x10 ack data: 0x13 0xAA 
write to 0x10 ack data: 0x14 0xAA 
write to 0x10 ack data: 0x15 0x00 
write to 0x10 ack data: 0x16 0x00 
write to 0x10 ack data: 0x17 0x00 
write to 0x10 ack data: 0x18 0x00 
write to 0x10 ack data: 0x19 0x00 
write to 0x10 ack data: 0x1A 0x00 
write to 0x10 ack data: 0x1B 0xE1 
write to 0x10 ack data: 0x1C 0xFF 
write to 0x10 ack data: 0x1D 0x0A 
write to 0x10 ack data: 0x1E 0xF0 
write to 0x10 ack data: 0x1F 0xF5 
write to 0x10 ack data: 0x27 0x00 
write to 0x10 ack data: 0x0F 0x00 
write to 0x10 ack data: 0x00 0x24 
write to 0x10 ack data: 0x01 0x24 
write to 0x10 ack data: 0x02 0x24 
write to 0x10 ack data: 0x03 0x24 
write to 0x10 ack data: 0x04 0xD5 
write to 0x10 ack data: 0x05 0xD5 
write to 0x10 ack data: 0x06 0xD5 
write to 0x10 ack data: 0x07 0xD5 
write to 0x10 ack data: 0x32 0xD1 
write to 0x10 ack data: 0x33 0x02 
write to 0x10 ack data: 0x55 
read to 0x10 ack data: 0x00
write to 0x10 ack data: 0x46 
read to 0x10 ack data: 0x08
write to 0x10 ack data: 0x46 0x08 
write to 0x10 ack data: 0x46 0x08 
write to 0x10 ack data: 0x45 0x00 
write to 0x44 ack data: 0x0A 0x11 
write to 0x44 ack data: 0x10 0x11 
write to 0x44 ack data: 0x11 0x11 
write to 0x44 ack data: 0x13 0x10 
write to 0x44 ack data: 0x20 0x77 
write to 0x44 ack data: 0x21 0x07 
write to 0x10 ack data: 0x55 
read to 0x10 ack data: 0x00
write to 0x10 ack data: 0x09 0x00 
write to 0x10 ack data: 0x0A 0x18 
write to 0x10 ack data: 0x0B 0x00 
write to 0x10 ack data: 0x0C 0x00 
write to 0x10 ack data: 0x0D 0x00 
write to 0x10 ack data: 0x0E 0x00 
write to 0x10 ack data: 0x0F 0x00 
write to 0x10 ack data: 0x10 0x00 
write to 0x10 ack data: 0x11 0x00 
write to 0x10 ack data: 0x12 0xAA 
write to 0x10 ack data: 0x13 0xAA 
write to 0x10 ack data: 0x14 0xAA 
write to 0x10 ack data: 0x15 0x00 
write to 0x10 ack data: 0x16 0x00 
write to 0x10 ack data: 0x17 0x00 
write to 0x10 ack data: 0x18 0x00 
write to 0x10 ack data: 0x19 0x00 
write to 0x10 ack data: 0x1A 0x00 
write to 0x10 ack data: 0x1B 0xE1 
write to 0x10 ack data: 0x1C 0xFF 
write to 0x10 ack data: 0x1D 0x0A 
write to 0x10 ack data: 0x1E 0xF0 
write to 0x10 ack data: 0x1F 0xF5 
write to 0x10 ack data: 0x27 0x00 
write to 0x10 ack data: 0x0F 0x00 
write to 0x10 ack data: 0x00 0x24 
write to 0x10 ack data: 0x01 0x24 
write to 0x10 ack data: 0x02 0x24 
write to 0x10 ack data: 0x03 0x24 
write to 0x10 ack data: 0x04 0xD5 
write to 0x10 ack data: 0x05 0xD5 
write to 0x10 ack data: 0x06 0xD5 
write to 0x10 ack data: 0x07 0xD5 
write to 0x10 ack data: 0x32 0xD1 
write to 0x10 ack data: 0x33 0x02

  • 0 in reply to Jeff YANG
    TI__Guru 59395 points

    Hi Jeff,

    If the customer does not know the loss of their system, then yes the best way to test how EQ is affecting the RX loopback functionality would be to adjust the values of the EQ pins in register 0x20 by going level by level, and seeing that improves the functionality. Going by the current setting, it looks like there is room for adjustment in these bits.

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    Mastermind 9265 points

    Hi Ryan,

    For Long Channel can't enter Loopback Mode, it also need adjust USB EQ setting, right? thanks!

    Jeff

  • 0 in reply to Jeff YANG
    TI__Guru 63216 points

    Hi Jeff,

    We know that TX passes, so the SSEQx settings are correct, and should be kept the same.

    We see that SC RX jtol passes, but LC RX jtol fails.

    This implies that the EQX settings must be increased. 

    Yes, adjust EQ will help the host to go into loopback mode.