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The two types of starter-generator that I can think off the top of my head are those used by GM in the mild hybrid Vue et al and the PHT Silverado.
The former is belt driven with some belt tension magic to maintain belt tension when either driven by or driving the engine. (The tension side of the belt shifts depending on which it is doing.)
The PHT has the starter-generator attached to the ring gear on the back of the engine and is direct drive, concentric with the crankshaft.
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