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EK-TM4C1294XL: SSI pinout. Clock doesn't have a positive and negative.

Marwa Safa
Prodigy 110 points
Part Number: EK-TM4C1294XL

I was looking at the SSI pinout in which I have attached part of it, but I was really confused. Isn't the point of SSI that both data and clock are differential pairs? However, I don't see a positive and negative for the clock at all, so how is this SSI, or am I looking at it wrong?

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    TI__Guru*** 135355 points

    Hello Marwa,

    Marwa Safa said:
    Isn't the point of SSI that both data and clock are differential pairs? However, I don't see a positive and negative for the clock at all, so how is this SSI, or am I looking at it wrong?

    You aren't wrong, it really is just an issue with naming conventions. The original device families that TM4C came from called the interface SSI and we stuck with that terminology, but really it is SPI.

    Obviously in hindsight it was a poor choice to make, but at the time I don't think SSI had as much traction as a known protocol.

    This thread also briefly touched on that: https://e2e.ti.com/support/microcontrollers/other/f/908/p/655730/2408470#2408470