SGPIO Protocol Layer: The SGPIO Bit Definitions
The figure below shows the relationship between SClock, SLoad and the two data bits; SDataOut and SDataIn. An SGPIO frame is started after SLoad has been low for at least 5 SClock cycles.
Following the start of a new SGPIO frame, 3 bits per drive are driven from the initiator on to the SDataOut line. Simultaneously, the target drives 3 bits on the SDataIn line. The initiator and target both use the rising edge clock to transmit changes in the SLoad, SDataOut, and SDataIn.
The figure shows SGPIO for 4 drive slots (12 clocks), which is the minimum allowed. The SGPIO stream can be larger and it is not uncommon for the stream to consist of slot data for 12, 24 or 36 drives/slots in the case of an expander.
Read more about this topic: IBPI
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