DS90UB948-Q1: Serializer and deserializer use SPI communication, MISO pin signal is delayed

user6558634

Part Number: DS90UB948-Q1

hi,ti

We used 941 and 948 together. When debugging SPI communication, we found that the MISO signal was delayed after passing through the serializer. how to solve this problem? We are configured in Forward mode, BC_HIGH_SPEED is set to 0, BC_FREQ_SELECT is set to 1, PATGEN_CDIV_N is set to 0x50, PATGEN_CDIV_M is set to 0x11. Figure 1 is the original data, and Figure 2 is the SPI data sent by the serializer.

over 4 years ago

0 Charley Cai over 4 years ago

TI__Genius 12866 points

Hi,

The data looks ok to me.

Could you clarify the question? Are you concerned with the propagation delay due to SerDes channel?

Best Regards,

Charley Cai

0 user6558634 over 4 years ago in reply to Charley Cai

Prodigy 120 points

Hi,Charley

Yes, we are bothered by this problem. It makes the data we obtain unreliable. The data we receive will switch between correct and incorrect.What should we do to get more reliable MISO data?

0 Charley Cai over 4 years ago in reply to user6558634

TI__Genius 12866 points

Hi,

There is always going to be a delay when data is sent across the SerDes channel. You can try to reduce the SPI speed.

Best Regards,

Charley Cai

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DS90UB948-Q1: Serializer and deserializer use SPI communication, MISO pin signal is delayed