| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the efficiency of access to a storage means by properly arbitrating requests to access the storage means through simple processing. <P>SOLUTION: A sound source device is provided with a sound source part 32 which generates a speech signal on the basis of speech data and a CPU 1 which controls the operation of the device, and allows both the sound source part 32 and CPU 11 to access the same memory. Further, the device is provided with an external memory 4 with a slow access speed, and an internal SRAM 19 and an internal ROM 18 with faster access speeds. When an access request from the sound source part 32 to the external memory 4 and an access request from the CPU 11 to the external memory 4 compete each other, an external bus arbitration part 15 performs arbitration giving priority to the access request from the sound source part 32, and when access requests to the internal SRAM 19 and internal ROM 18 compete, arbitration parts 16 and 17 performs arbitration allowing access of a higher frequency from the CPU 11 than access from the sound source part 32. <P>COPYRIGHT: (C)2004,JPO |
