DS90UB935-Q1: 100MHz-300MHz EMI issue

Hello Roy,

At which data rate is the Ser-Des running?

Which clocking mode is being used? i.e. external clock or synchronous mode?

is the problem you are having is an Emission problem or Immunity?

Hi Hamzeh,

I sent you some file due to confidential.

1. Data rate : 24MHz * 160 = 3.84Gbps.
2. Clock mode : Synchronous mode.

Regards,

Roy

Hello Roy,

can you try the following two tests:

To lower Serializer's VOD from 1.1Vpp to 0.8Vpp you need to write:

0xB0,0x04 then 0xB1,0x5F and 0xB2,0x02.

To again increase the Serializer's VOD from 0.8Vpp to 1.1Vpp write:

0xB0,0x04, then 0xB1,0x5F and 0xB2,0x00

You can also Slow down the Serializer's output (Rise/ Fall time) by writing:

0xB0,0x04, then 0xB1,0x5F and then 0xB2,0x04.

To restore the original Rise/Fall time, write:

0xB0,0x04, then 0xB1,0x5F and 0xB2,0x00

Hi Hamzeh,

Could you also provide a table to show the meaning of the values changed in registers B0/B1/B2 indirect register?

We find that our current setting values are 0x04/0x4a/0x3f and you suggested to change them to 0x04/0x5f/0x02 for 1.1V adjustment and change to  0x04/0x5f/0x04 for rise/fall time adjustment, I also want to know the meaning for our current settings (0x04/0x4a/0x3f). Thanks.

Regards,

Roy