TUSB522P: eye test

Feeney Xiao

Part Number: TUSB522P

Tool/software:

Hi expert

could you please share me some user guide about how to use TUSB522P for eye test? if you can also tell me how to configure the USB signal and how to set the test instruments can be better.

10 months ago

0 Vishesh Pithadiya 10 months ago

TI__Mastermind 46501 points

Hi Feeny,

To use the TUSB522p to capture an eye diagram you will need a few things.

1) super speed USB host (5Gbps)

2) USB-A or USB-C breakout fixture. This will split the USB connector to SMA cables to connect to the scope

3) USB compliance software on scope

4) You will need to configure the port on the USB host into compliance mode

5) You may need a function generator to manually select which pattern to output from the host.

You want as low loss as possible from the Host to the scope

Steps:

1) Use the compliance software on the USB host to configure the port into compliance mode for 5gbps.

2) Connect breakout fixture to USB host

3) connect SSTXp/n to scope

4) connect function generator at 250mV offset and 500mVpp. send a single pulse from 10-20Mhz to the SSRXp line to chnage the compliance pattern.

5) Run compliance software on scope and adjust pattern accordingly.

0 Feeney Xiao 10 months ago in reply to Vishesh Pithadiya

TI__Expert 3540 points

Hi Vishesh

We can test the TX path eye pattern, how to test RX path.

0 Vishesh Pithadiya 10 months ago in reply to Feeney Xiao

TI__Mastermind 46501 points

Hi Feeny,

Sorry for the delays, I was out on travel. This would be an RX JTOL test. This will not have an eye diagram

0 Vishesh Pithadiya 10 months ago in reply to Vishesh Pithadiya

TI__Mastermind 46501 points

for the RX jtol test you will need a host that is placed into loopback mode. Sends out all data it takes in. The SSTX pins will be connected from the BERT to the USB conn. The SSRX will be connected from the USB conn. to the BERT. This is a jitter tolerance test.

+1 Vishesh Pithadiya 10 months ago in reply to Vishesh Pithadiya

TI__Mastermind 46501 points

Hi,

I'm closing this thread due to inactivity

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TUSB522P: eye test