DP83TG720R-Q1: Open Alliance TC8 test，PMA_TX_04 and transmitter timing jitter

Zhang yuzhen

Part Number: DP83TG720R-Q1
Other Parts Discussed in Thread: DP83TG720S-Q1

DP83TG720R-Q1 Open Alliance TC8 test：

1：OABR_PMA_TX_04 Check the Transmitter Power Spectral Density (PSD) ，PSD is fail at about 400MHz ，is there any Reg to solve it？

2：MDI transmitter timing jitter is out of limit，is there any method such as set Register to improve performance？

over 4 years ago

0 Gerome Cacho over 4 years ago

TI__Mastermind 44975 points

Hello,

Please see SNLA371 for appropriate register configurations.

Sincerely,

Gerome

0 shuai zhang over 4 years ago

Prodigy 30 points

0 shuai zhang over 4 years ago in reply to Gerome Cacho

Prodigy 30 points

Hi Gerome

I use the DP83TG720S-Q1, have the same problem，PSD is fail at about 400MHz.

Is there any Reg to solve it? such as Improve the MDI's driving ability.

I have read DP83TG720S-Q1‘s datasheet and SNLA371,just find two points as below. These way just for CLKOUT and RGMII pads.

For MDI, there is not mentioned.

Thanks & Best regards

shuai

0 Gerome Cacho over 4 years ago in reply to shuai zhang

TI__Mastermind 44975 points

Hi Shuai,

Please see section 3 of SNLA371. I also see that you have created a new thread. For followups, please use new thread as means of communication. I shall close this thread.

Sincerely,

Gerome

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DP83TG720R-Q1: Open Alliance TC8 test，PMA_TX_04 and transmitter timing jitter