Hi engiz, I'm basing myself off of the document that I've attached below. Roughly speaking, the FPC cables at a worst case have a dielectric constant of 4.0, and as the dielectric constant goes up, so does the propagation delay. Propagation delay goes up proportionally with length. So a 10 inch cable might have at worst a 1.5ns propagation delay. This might not be bad enough so that you're getting SDO data back on the wrong edge of SCLK, but it is important for signal integrity reasons, and it needs to be treated as a transmission line. With good layout and termination techniques, I think that you should be able to make this work. I recommend looking at the document closely. It goes over the reflection issues you might see, and good practice on mitigating them. Some design specific parameters such as signal rise and fall times will largely depend on your MCU choice or after measuring your implementation. Let me know if this document helps, or if I can provide any other design resources. e2e.ti.com/.../transmissionlines.pdf Regards, Joel
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