Tag control system in a hierarchical memory control system

Details Tag control system in a hierarchical memory control system Tag control system in a hierarchical memory control system

1991-07-29

1994-11-01

Robertson, David L.

G06F 1300

Patent

active

053613422

ABSTRACT:
A hierarchical memory control system including N central processing units each processing unit having a store-in type buffer storage unit; a main storage unit commonly used by the N central processing units; and a global buffer storage unit of a store-in type connected between the central processing units and the main storage unit. The global buffer storage unit is used for storing a data block transferred from the main storage unit, each entry of the global buffer storage unit being larger than each entry of the buffer storage unit, and the data block in each entry of the global buffer storage unit being divided into M divided blocks. In addition, the invention includes a tag unit for managing the entries of the global buffer storage unit, including tags respectively corresponding to the entries of the global buffer storage unit, each tag including managing data for managing the data block. A buffer control unit controls the managing data in the tag unit, the buffer control unit controlling the tag unit and the global buffer storage unit in such a way that, when the data stored in the buffer storage unit is modified, the modified data is reflected at the global buffer storage unit in accordance with the managing data in the tag unit. Also, when the data stored in the global buffer storage unit is modified, the modified data is reflected at the main storage unit in accordance with the managing data in the tag unit.

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