Maintaining at least partial functionality of a device as defined by a hardware configuration at a USB bus enumeration while the device memory is programmed

摘要

Method and apparatus for programming non-volatile, programmable, electrically-erasable memory using a USB interface are presented. According to one aspect, a method for in-system programming of non-volatile, programmable, electrically erasable device memory using a USB interface includes the steps of: enumerating at least one device onto a USB bus with a first hardware configuration; encapsulating programming commands and program data into USB packets according to a custom protocol; sending the USB packets including the encapsulated programming commands and program data to the at least one device over the USB bus; and programming at least a portion of the device memory in response to receiving the programming commands and program data at the at least one device. At least partial functionality of the at least one device as defined by the first hardware configuration is maintained while the device memory is programmed.