DS64BR111: Running at different bitrates

Mikael Carlsen

Intellectual 270 points

Part Number: DS64BR111

Hi,

Can DS64BR111 have different bitrates running on channel A and channel B?

Our repeater doesnt work as expected. Some disturbance is added to the output.

On the measuerments in the attached pictrue, there seems to be some peaks etc that should not be there.

C2/C3 (pink/blue)=Single ended output measurements, channel A

Green= Differential measurement input, channel A

Channel B has 4.25Gbps running, and channel A 1.0625Gbps.

Regards Mikael

over 5 years ago

0 Mikael Carlsen over 5 years ago

Intellectual 270 points

Just some more clarification. The driver is set up with SMBus configuration but we didnt set up any parametes yet.

So, will the default settings work or do we need to configure the device?

Regards Mikael

0 Brian Zhou over 5 years ago in reply to Mikael Carlsen

TI__Guru*** 146515 points

an engineer is assigned for this ticket and will reply soon

0 Mikael Carlsen over 5 years ago in reply to Brian Zhou

Intellectual 270 points

Hi, I found the problem. The default EQ setting was not correct for our application (default for up to 10m cable). When the EQ was changed to 0 dB it works.

The length is approximately 10 cm on PCB.

Regards Mikael

0 Lee Sledjeski over 5 years ago in reply to Mikael Carlsen

TI__Mastermind 43795 points

Hi Mikael,

Yes running at different rates is not an issue for redrivers. Glad you were able to debug the issue quickly. A 10cm trace has minimal attenuation at ~ 4 Bbps and this matches up well with our lowest equalization setting.

Regards,

Lee

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DS64BR111: Running at different bitrates