Fifo register device adaptively changing a stage number in depen

Details Fifo register device adaptively changing a stage number in depen Fifo register device adaptively changing a stage number in depen

1989-12-12

1992-07-28

Lee, Thomas C.

Boots, shoes, and leggings

3642318, 3642387, 364933, 364939, 3649261, 3642549, 364240, 364DIG1, 364DIG2, G06F 938

Patent

active

051345625

ABSTRACT:
In a first-in-first-out register device positioned intermediately between an address calculation circuit and an operation execution circuit, both of which are individually operable in pipeline fashions, a stage number is varied from one to another in a register unit having a plurality of register stages, in consideration of an execution time which is necessary for a bus access operation carried out in response to a read instruction and which is variable. A maximum usable stage number is determined by a pointer control circuit in response to the variable execution time and is compared with an actual stage number, which is sent from a detector and which indicates an actual stage of the register unit. As a result, the register unit is controlled, so that the actual stage does not exceed the maximum usable stage.

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