| 摘要 |
PROBLEM TO BE SOLVED: To decrease the number of mount points on a substrate by forming a memory area of plural areas which are formed on the same silicon substrate and have different access times. SOLUTION: On the mount substrate 10, a CPU 11, a mixed memory 12, and other LSIs are mounted and the CPU 11 and mixed memory 12 are connected by an address bus 13 and a data bus 14. The CPU 11 reads a program such as an OS out of the mixed memory 12, and decodes and executes the program to control the whole operation of a game machine. The mixed memory 12 is composed of, for example, a mask ROM and has a high-speed memory area 15, an intermediate-speed memory area 16, and a low-speed memory area 17 formed on the same silicon substrate as the memory areas which have different operation speeds (access time). The high-speed memory area 15, intermediate- speed memory area 16, and low-speed memory area 17 are set to respective corresponding operation speeds by making, for example, their program system different.
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