Doing various treatments circuit construction control manner null of the load

摘要

PPROBLEM TO BE SOLVED: To omit an SRAM as a backup memory circuit. PSOLUTION: When a system is turned off, the backup memory circuit is constructed in an FPGA 3 and powered from a backup power supply 5. When a system is turned on, the data stored in the FPGA 3 is read into a work memory of a DRAM 2. Subsequently, an I/O control circuit is constructed in the FPGA 3 and navigation processing is executed. When the system is turned off, the backup memory circuit is again constructed in the FPGA 3 and the data required when the system is next turned on out of the data stored in the DRAM 2 is transferred to the backup memory circuit, and then the system is turned off. PCOPYRIGHT: (C)2009,JPO&INPIT