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STM32F4 USB reg NZLSOHSK bit question

Question asked by bryukhnov.petr on Feb 12, 2013
Hi you there!

Got stuck while programming a USB vendor specific device on STM32F4 MCU. The device is intended to be self-powered with custom usb driver.

During initial programming (core and device init. settings) I don't know what actually to do with the NZLSOHSK bit. What is it responsible for? If we turn to USB in a nutshell, it says that non-zero length data is a DATA from the host and should be read by the application. So what to do with this bit? Should I keep it "0" or where am I wrong?