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Question: How is renumeration procedure possible if firmware cannot be uploaded to the SX2?
The SX2 requires no firmware because it is a USB 2.0 SIE-only chip. The firmware runs on the host processor to manage the data flow and configure the SX2 chip. FX2 Note: There isn't really a "renumeration" process like in FX2. If the host processor wants to load a new identity, it must write to the descriptor RAM area again.