SN75DP130: SN75DP130 after link training's EQ value

Shu-Cheng LIN

Part Number: SN75DP130

Hi Sirs,

Sorry to bother you.

We have use DP130, our design as below.

There is no software to control the SN75DP130 register,
We want to know what is the actual EQ compensation of the SN75DP130 after link training? ?
We can access the SN75DP130 normally through the debug mode (the external development board is connected to the SN75DP130).
So how could we check the the EQ value after link training?? and which register?? 0dB,3.5dB,6dB,8dB?

over 6 years ago

0 David (ASIC) Liu over 6 years ago

TI__Guru**** 187331 points

Shu-Cheng

You can read the pre-emphasis level after the link training through the DPCD registers, and then look up Table 3 to find the EQ value base on the read pre-emphasis level.

Thanks

David

0 Shu-Cheng LIN over 6 years ago in reply to David (ASIC) Liu

Guru 11785 points

Hi Sirs,

Thanks for your reply.

Please help double confirm if I have a misunderstanding.

DPCD address 00103h read out as 0x01 (voltage swing level 1 and pre-emphasis level 0)
So I correspond to the AEQ (L0) 8dB right? ?

0 David (ASIC) Liu over 6 years ago in reply to Shu-Cheng LIN

TI__Guru**** 187331 points

Shu-Cheng

This is the correct interpretation.

Thanks

David

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SN75DP130: SN75DP130 after link training's EQ value