| 摘要 |
PURPOSE:To improve the data transfer capability of a multiplexer channel by constituting the processing time required for data transfer to be constant independently of the transfer byte width. CONSTITUTION:The transfer byte width (m) in a microprogram is set to a byte request register 7 to apply initializing processing of a local counter 8 and setting of a byte counter register 9. When data is transferred with an input/ output device 12-i, the count of the local counter 8 is counted up at each 1 byte transfer, compared with a value of the byte request register 7 and when they are coincident, the next transfer processing request CHREQ is issued to the microprogram and the value of the byte counter register 9 is decreased by the count of the local counter 8. The byte counter is referenced at the microprogram side to prepare for the next transfer. |
