Boots – shoes – and leggings
Patent
1990-02-28
1993-02-09
Anderson, Lawrence E.
Boots, shoes, and leggings
364247, 3642646, 3642624, 3642628, 364DIG1, 364933, 395800, G06F 930, G06F 938
Patent
active
051858720
ABSTRACT:
A scbok line is connected to a register file and other units, such as an execution unit and a multiply/divide unit, in a data processing system. A mem scbok line is connected to the register file and other units, such as an instruction unit and a memory interface unit. Each unit connected to the scbok line can pull the line to indicate that it is busy. Each unit connected to the mem scbok line can pull the line to indicate that it is busy. The scbok line indicates, when asserted, that a unit or a register in the register file that is busy with a previous instruction is not available to an instruction for a register file operation. The mem scbok line indicates, when asserted, that a unit or a register in the register file that is busy with a previous instruction is not available to an instruction for a memory operation. Registers are checked concurrently with the issuing of an instruction. An instruction lacking any needed unit or a register is stopped in response to the asserted scbok line and reissued in the next cycle. Registers to be used by a multi-cycle instruction are marked busy for an instruction that is able to be executed. When a result for the multi-cycle instruction returns the registers previously marked busy are marked as not busy.
REFERENCES:
patent: 4472787 (1984-09-01), Busby
patent: 4493020 (1985-01-01), Kim et al.
patent: 4891753 (1990-01-01), Budde et al.
patent: 4903196 (1990-02-01), Pomerene et al.
patent: 5073855 (1991-12-01), Staplin et al.
patent: 5099421 (1992-03-01), Buerkle et al.
Arnold James M.
Hinton Glenn J.
Smith Frank S.
An Meng-Ai T.
Anderson Lawrence E.
Intel Corporation
Lamb Owen L.
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