Abstract: Provided are methods and apparatus that provide for removing unnecessary configuration information from the bitstream to configure a field programmable gate array (FPGA) using a reduced bitstream stylized as a “microbitstream.” The method and apparatus split FPGA configuration information into two separate configurations to reduce the initial configuration while applying encryption and authentication to the initial bitstream and leverage partial reconfiguration through a bootloader to load in secondary functionalities during or after run time of the initial configuration. Encryption and authentication are also applied to secure the bitstream from tampering, cloning, and malicious insertions. The present apparatus and methods achieve significant reductions in the total configuration time of an FPGA, which is particularly useful for time-sensitive systems, thus decreasing program development costs and time spent in the design process.

Abstract: A mask system for use between a patient and a device to deliver a breathable gas to the patient includes a mouth cushion, a pair of nasal prongs, an elbow, and a headgear assembly. The mouth cushion is structured to sealingly engage around an exterior of a patient's mouth in use, and the pair of nasal prongs are structured to sealingly communicate with nasal passages of a patient's nose in use. The elbow delivers breathable gas to the patient. The headgear assembly maintains the mouth cushion and the nasal prongs in a desired position on the patient's face. The headgear assembly provides a substantially round crown strap that cups the parietal bone and occipital bone of the patient's head in use.