DS280DF810: PRBS

Jianing Zhu

Expert 4325 points

Part Number: DS280DF810

Hi,

We are using DS280DF810 for 8ch 200G data retimer. PRBS function is necessary for this project.

However, there isn't any data in PRBS checker error count register 0x83 or 0x84. What could cause this problem?

Could you please recommand the way to test PRBS function?

Thanks & BR

over 3 years ago

0 Rodrigo Natal over 3 years ago

TI__Mastermind 19235 points

Hi,

Channel registers 0x83 and 0x84 are indeed used to track the PRBS checker error count. There is a configuration write sequence that is required to enable PRBS checker. You may refer to the retimer programming guide contains all the common retimer configuration sequences. To gain access to this technical doc, simply place a request via the TI.com product page. See request link below.

https://www.ti.com/drr/opn/DS280DF810-DESIGN

Thanks,

Rodrigo Natal

0 Jianing Zhu over 3 years ago in reply to Rodrigo Natal

TI__Expert 4325 points

Thanks Rodrigo,

(1) We have the programming guide and the registers are set as reference. The program is as following:

However, it seems that the PRBS generater doesn't work, Reg 83 and 84 shows 0, and Reg 01 shows 0x80.

(2) In earlier post discussing this topic, link: https://e2e.ti.com/support/interface/f/138/t/701766?tisearch=e2e-sitesearch&keymatch=%2525252525252520user%252525252525253A90220

In hardware setup step, what dos 'the clock generator' mean? Does differential 100-ohm SMA cable necessary?

BR, Jianing

0 Rodrigo Natal over 3 years ago in reply to Jianing Zhu

TI__Mastermind 19235 points

Some debug suggestions,

The retimer PRBS generator channel requires some input signal for its CDR to lock to. This signal may be a sub-rate clock signal at frequency multiple of programmed data rate. Please confirm the PRBS generator has a reference input signal and its CDR is locked
For retimer Rx channel used for PRBS checker, can you provide a full channel registers dump?

Thanks,

Rodrigo Natal

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DS280DF810: PRBS