| 摘要 |
An image forming apparatus capable of receiving data in high speed in accordance with high speed data transmission interface. The invention includes, a DMA transmission device, a bi-directional communication device, a flag indicator for indicating a status of the receiving parallel data from a host system according to DMA transmission is executed or not by the DMA transmission device a control device controls executing of the bi-directional communication by the bi-directional communication device that when the flag indicator indicates the receiving parallel data from a host system according to DMA transmission is executed, a signal of availability of bi-directional communication is sent to the host system after the receiving parallel data from a host system according to DMA transmission is suspended. When said flag means indicates said receiving parallel data from the host system according to DMA transmission is not executed, a signal of availability of bi-directional communication is sent to the host system immediately.
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