| 摘要 |
PURPOSE:To simplify the processing as well as to decrease the number of instructions between host communication controllers, by providing a means which informs the length of each reception data divided into one or plural blocks. CONSTITUTION:A reception data length holding means, etc. is provided to inform the length of each reception data divided into one or plural blocks. For instance, when the data is received at a host 1 from a terminal 5, the host 1 delivers a read instruction to a communication controller 2. Then the controller 2 performs transmission/reception via a transfer buffer 9, and a data length register 8 holds temporarily the count value of the length of the data which is transferred by a read command and then transfers the count value to the host 1 at the start of the data transfer. Then the data is transferred to a reception data buffer 6 of the host 1 from the buffer 9 via a data address register 10, etc. and in order of address rising. |
