TM4C129ENCPDT: Question of SPI

user5624527

Part Number: TM4C129ENCPDT

Dear Team:
I am doing SPI test recently and configured as slave. I need to send data to M4 (master) at the red part that I marked in below picture, My question is when SSINRX exchange data, does the phase of SSINCLK's falling edge requires absolutely aligned?

Best regards

K.K

over 7 years ago

0 Bob Crosby over 7 years ago

TI__Guru 72500 points

No, in the mode where SPO=0 and SPH=0, data is sampled on the rising edge of SSICLK. As long as the setup and hold time requirements (in section 30.17 of the data manual) are met with respect to the rising edge, when the data changes with respect to the falling edge is not important.

0 user5624527 over 7 years ago in reply to Bob Crosby

Intellectual 800 points

Dear Bob:

How many nanoseconds can I delay or advance when exchanging data? Do you have any document for my reference?

Best regards
K.K

0 Bob Crosby over 7 years ago in reply to user5624527

TI__Guru 72500 points

It depends on the SSICLK speed. The timing requirements are given in section 30.17 of the datasheet.

0 user5624527 over 7 years ago in reply to Bob Crosby

Intellectual 800 points

Dear Bob:

1, When M4 work on master mode, I use FPGA, Can I operate as the sequence chart of master mode?
2, Why there is no S14 on the sequence chart?

Best regards
K.K

0 Bob Crosby over 7 years ago in reply to user5624527

TI__Guru 72500 points

I am sorry, I do not understand your questions. Would you please rephrase your questions and ask again? What is the "sequence chart" which you refer to?

0 user5624527 over 7 years ago in reply to Bob Crosby

Intellectual 800 points

Dear Bob:

I don't know what is correct, most likely is timing diagram？ Or time sequence diagram？In Chinese, it is "时序图".

Best Regards,
K.K

0 Bob Crosby over 7 years ago in reply to user5624527

TI__Guru 72500 points

Thank you. I now understand. Yes, I use the word "timing diagram". Now I see the issue. In table 30-46 the numbers are not correct. Notice there is no "S12". Trxdssu should be "S12" not "S13" and Trxdsh should be "S13" not "S14".

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TM4C129ENCPDT: Question of SPI