| 摘要 |
The present invention provides an accelerator working in place of a CPU on a motherboard to speed up the processing. The accelerator can realize the high-speed processing even when a clock on the accelerator is not an integral multiple of a clock on the CPU. When a clock frequency of a clock signal CLK on the motherboard is equal to 20 MHz and a maximum frequency of a CPU (3) on an accelerator (100) is equal to 33 MHz, for example, the CPU (3) does not work properly when supplied with a doubled clock signal. In such a case, a clock multiplication circuit (3a) multiplies the clock signal CLK by 1.5 times to generate a clock signal CLK15. There are three different patterns in the relationship between the timing of access of the CPU 3 and the timing of access of the motherboard. The accelerator of the invention determines the appropriate timing in each case and allows the access to/from the CPU 3 to be synchronous with the access to/from the motherboard. <MATH> |
