| 摘要 |
PURPOSE:To avoid deadlock caused when plural modules cannot execute transmission/reception simultaneously by prioritizing plural modules, detecting and processing the situation where the two modules simultaneously request transmission. CONSTITUTION:A module number coincidence detection circuit 4 detects that the transmission destination module number 12 in its module and a transmission source module number 2 outputted by a module 11 on the other end are the same, and recognizes that the 1st and 2nd modules 11a and 11b request transmission. Afterwards a transmission priority decision circuit 5 decides the priority in terms of transmission between the self module and the module on the other end, and gives a control signal based on the decided result to a transfer control part 6. Since the priority of the 1st module 11a is higher than that of the 2nd module 11b, the 1st module continues its transmission action. On the other hand, the 2nd module 11b temporarily interrupts its transmission action in order to avoid the deadlock, and accepts transmission from the 1st module 11a.
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