On Thu, May 08, 2014 at 03:06:48PM -0400, Alan Stern wrote: > On Thu, 8 May 2014, Paul Zimmerman wrote: > > > Just FYI, the DWC3 core is designed to always respond to SETUP packets. > > It has a 3-deep input buffer for SETUPs, provided the RxFIFO is set up > > properly according to the databook. If the buffer fills up, then > > further SETUP packets will get lost, but they will still be ACKed. > > Really? That seems odd. Isn't the most recent SETUP packet the one > you want to handle? And we _will_ handle the most recent SETUP packet. It's just that we're obligated to still start Data/Status phase before going back to that SETUP packet. Note that neither Data/Status will shift anything into the wire, they will complete as soon as they are started, but they _must_ be started anyhow. -- balbi
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