| 摘要 |
PROBLEM TO BE SOLVED: To shorten the retrieval and the time for updating of an empty queue that a queue generating device for received data uses next. SOLUTION: An empty queue number storage register group 50 and a transmission-completed record storage register group 54 are each composed of registers. The respective registers of the empty queue number storage register group 50 hold empty record numbers used as addresses, when received data are stored in a data storage device 22. When the contents of all the registers are used, an empty queue read circuit 51 reads empty record numbers out to the data storage device 22 at a time and provides them for the empty queue number storage register group 50. When transmit data read in from the data storage device 22 are sent out to a line, the respective registers of the transmission-completed record storage register group 54 hold their record numbers, and when all the registers are filled, a release writing circuit 52 release all the records to the data storage device 22 at a time.
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