DS125DF1610: Time to finish Adap-1

Thanks, I can make a measurement to find out.

In my board, a IC will send data to DS125DF1610, while the initial data pattern is like below:

send 1010 pattern for 2us

-> stop 1us

-> send 1010 pattern about 3us

-> stop 1us

-> send 1010 pattern for 40us

-> normal data pattern

Will this kind of initial pattern have influence on EQ of Adapt-1?

Thanks

Chris

Hi Chris,

I don't expect the duration of this initial pattern to have an effect on the EQ.

To confirm this, the HEO/VEO on the TX side of the retimer can be compared after lock with and without the initial pattern present.

Thank you,

Evan

Hi Evan,

Thanks for your quick response.

Unfortunately, I can't turn on/off the initial pattern.

Regards

Chris

Hi Chris,

Although it seems unlikely the initial pattern will have an effect on EQ during adaptation, another option is to set a constant EQ value manually with adapt mode 0 relative to the amount of insertion loss.

Thank you,

Evan

Hi Evan,

For now I'm using Adapt-1, and the insertion loss on my board is about 5-6dB@10Gbps, I'm using 10.3125Gbps, 

Most of the EQ results are:

1) 0-0-0-0, 0.29dB@2.5GHz

2) 0-0-0-1, 3.69dB@5.5GHz

3) 0-0-1-0, 4.06dB@6GHz

Sometimes there will be other value, like 0-0-0-2, 1-0-0-0, which value should I use, kind of confuse.

Thanks

Chris