Reservation station with a pseudo-FIFO circuit for scheduling di

Details Reservation station with a pseudo-FIFO circuit for scheduling di Reservation station with a pseudo-FIFO circuit for scheduling di

1996-06-13

1997-11-04

Lim, Krisna

395390, 395391, 395673, G06F 930

Patent

active

056849710

ABSTRACT:
A reservation station includes a memory array in which micro-operations are stored at entry locations with an age representing a temporal ordering. Control circuitry resets the age of a new micro-operation, and increments the ages of previously stored micro-operations, when an entry is written into the array. Wired-OR circuitry is utilized to find the oldest age within the memory array, which is then broadcast through the array to generate a priority pointer that identifies a group of entries which contain an entry with the oldest age. Scheduling logic selects a ready entry in the group for dispatch to a port of the execution unit.

REFERENCES:
patent: 5220653 (1993-06-01), Micro
patent: 5560025 (1996-09-01), Gupta et al.
patent: 5613080 (1997-03-01), Ray et al.
patent: 5625837 (1997-04-01), Popescu et al.

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