acknowledgement for SPI

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SPI does not include any handshaking or acknowledgement as part of its protocol. However, it would be a simple matter in your design(depending an WHAT your actual design is) to have a slave respond to a command with an ACK or NAK. Basically, you would build the handshaking into your system, using SPI as your medium.
 

What is your hardware? FPGA? Microprocessor? Since SPI doesn't have a handshaking signal you're going to have to create your own. But why wouldn't you just do it with software?
 

I,again, would just recommend that your upper-level software implement the Acknowledge function.
 

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