| 摘要 |
A bi-directional RAM is coupled between a first control device for data transfer using a first clock frequency and a second control device for data transfer using a second clock frequency having no multiple relation with the first clock frequency. The bi-directional RAM includes first and second data registers, first and second flag registers, and first and second controllers. The first controller performs a data input to the first data register and a data output from the second data register using the first clock frequency, and sets a flag in the first flag register when data is input to the first data register. The second controller performs a data input to the second data register and a data output from the first data register using the second clock frequency, and sets a flag in the second flag register when data is input to the second data register.
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