Control device for direct access to operating medium - increases priority sequence for async. operating medium and reduces DMA operating condition for sync. operating medium

摘要

The control equipment comprises a processing unit (1) which is arithmetical, at least one sync. operating medium (4-6) for the arithmetical processing unit (1), at least one async. operating medium for (7-9) the processing unit (1) and a bus (10) for transmission of data between the processing unit and the sync. and async. operating media. A priority position list (1a) adjusts the access priority sequence for the async. operating medium higher than that for the sync. medium. An installation (1,2) is provided for selection of a request from one or several (CHO-CH3 requests) for access to one of the media after indication of the contents of the priority position list and for access to the operating medium corresp. to the selected request, dependent upon the request chosen.