A queue device with the possibility of a fast transmission of a digital signal unit which has a width other than simple word width

摘要

In a queue device comprising a first-in-first-out memory device which has first through N-th memory stages and which successively shifts memorized signal units towards the N-th memory stage through which each memorized signal unit is successively produced as a basic sequence of output digital signal units, a supplementary memory is connected to a predetermined one of the memory stages that is for producing an additional sequence of output digital signal units. Both the output digital signal units of the basic and the additional sequences can be simultaneously produced in parallel in the form of two words and are delivered to an instruction execution unit. Thus, two words of the output digital signal units are quickly sent to the instruction execution unit. When each output digital signal unit of the basic sequence is sent from the N-th memory stage, the additional sequence is derived from the (N - 1)-th memory stage. The memory device carries out the above-mentioned operation under control of a queue control circuit and a queue pointer.