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DS90UB926Q-Q1: SPI communication

Roy Chou1

Genius 16080 points

Part Number: DS90UB926Q-Q1

Hi Team,

My customer plan to use 941+926 as SerDes. Now they want to use their GPIO as SPI transmission. For forward channel, the BW is enough to transmit the related SPI signal, but as you know, for MOSI, it will use backward channel. I'm not sure how to calculate the BC bandwidth. Can you let me know the calculation? Thank you.

Regards,

Roy

over 3 years ago

0 Logan Cummins over 3 years ago

TI__Guru 66810 points

Hi Roy,

Back-channel bit rate would be defined per below.

Regards,

Logan

0 Roy Chou1 over 3 years ago in reply to Logan Cummins

TI__Genius 16080 points

Hi Logan,

Yes, I saw the table. But I'm not sure why we didn't list the MAX value of BC bit rate. We need MAX value to check if BW is enough or not.

Regards,

Roy

0 Logan Cummins over 3 years ago in reply to Roy Chou1

TI__Guru 66810 points

Hi Roy,

No, you would compare if the minimum through-put of the BC (worst case) is able to meet the target bit rate you are trying to achieve.

Regards,

Logan

0 Roy Chou1 over 3 years ago in reply to Logan Cummins

TI__Genius 16080 points

Hi Logan,

So, the BC min data throughput is 50kbps(25kHz) So it looks like that the GPIO(BC direction) max bandwidth is 25kHz? Is it right?

Regards,

Roy

0 Logan Cummins over 3 years ago in reply to Roy Chou1

TI__Guru 66810 points

Hi Roy,

Yes, that is correct.

Regards,

Logan