Program controlled device whose operating system is capable of being upgraded and the new version switched over to, without having to restart the device

摘要

the device has a processor and a program memory (DRAM) which can be addressed by the processor over address lines. A switchable changeover device(ASL) connected in the address lines enables two memory regions to be interchanged. The changeover device can be changed over manually or under program control. It can be changed over in an event dependent manner.