TUSB1002EVM: Cannot see USB 3.0 devices after the re-driver.

tikitaka

Part Number: TUSB1002EVM
Other Parts Discussed in Thread: TUSB1002,

Hello, my setup is:

Host PC ------>(USB A to USB B cable 0.5 m)--------->TUSB1002EVMRe-driver------------> USB 3.0 stick memory

Host PC ------>(USB A to USB B cable 0.5 m)--------->TUSB1002EVMRe-driver------------> (USB A to USB A cable 1.5 m)-------------------> USB 3.0 stick memory

I've tried USB 3.0 and 3.1 ports,

I've also tried different jumpers configuration for the EQ and Config

But the behavior is always the same: I see the device behind the Re-driver in USB 2.0 mode.
I cant get transfer rates over 40 MB/s

Note that with USB 3.0 windows advises that the device can be connected to SS port.( it is already connected to SS port)

I've tried also in linux and I could check that the connection detected was 2.10 same as windows.

So I'm out of ideas to figure out how to see a device behind this re-driver working successfully at 3.0 Mode.

Thanks in advance for the answers.

over 7 years ago

0 Nicholas Mariani9 over 7 years ago

TI__Intellectual 2100 points

Hey tikitaka,

Could you send along your jumper config? Could be helpful to us in diagnosing the issue.

Best Regards,
Nick

0 Diego Cortes over 7 years ago

TI__Mastermind 36085 points

Hello Tikitaka,

I think that the issue here is that you have a short cable and thus the TUSB1002 is over equalizing the signal. Please consider to test the EVM using longer cables, like 1.8m. Do you have a USB analyzer, to see the USB packets and debug this issue deeper?.

Regards,
Diego.

0 tikitaka over 7 years ago in reply to Nicholas Mariani9

Prodigy 40 points

Hello Nick

I've tried different jumper configurations but here is the most basic one that I'm using.

0 tikitaka over 7 years ago in reply to Diego Cortes

Prodigy 40 points

By your recommendation I've connected the TUSB1002EVM like this:

Host PC ------>(USB A to USB B cable 1.8 m)--------->TUSB1002EVMRe-driver------------> (USB A to USB A cable 1.8 m)-------------------> USB 3.0 stick memory

The behavior is still the same, no benefit from this config.
Actually my goal is to test a USB stick after 5m of cable with the TUSB1002 at the beginning and at the end of the 5m.
But currently I'm just trying to see the TUSB1002 working.

Regards

0 Diego Cortes over 7 years ago in reply to tikitaka

TI__Mastermind 36085 points

Tikitaka,

Can you get eye measurements, so we can estimate the correct EQ settings for your implementation?

Regards,

diego.

0 Nicholas Mariani9 over 7 years ago in reply to Diego Cortes

TI__Intellectual 2100 points

Hey Tikitaka,

Just a message to boost the thread back to your attention in case Diego's request got buried.

Best Regards,
Nick

0 tikitaka over 7 years ago in reply to Diego Cortes

Prodigy 40 points

Hello Again,

We could measure the signals TX and RX with a differential prove on the USB3.0.

We can just see some communication when device is plugged in, then we have no signaling anymore.

It moves to USB 2.0.

Then we try most of the EQ configurations and CFG options without success. ( reseting the device each time)

We dont know why is so difficult to see USB 3.0 interface working through this Re-driver.

Regards,

Fernando

0 Diego Cortes over 7 years ago in reply to tikitaka

TI__Mastermind 36085 points

Hello Tikitaka,

Perhaps it is the same incompatibility issue that this post describes. The workaround is to include AC capacitors on the RX differential pair, as described in the post.

Regards,

Diego.

Interface

Interface forum

TUSB1002EVM: Cannot see USB 3.0 devices after the re-driver.