Method of transferring data in a processing system

Details Method of transferring data in a processing system Method of transferring data in a processing system

2005-02-08

2005-02-08

Sparks, Donald (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Shared memory area

C711S130000, C711S151000, C710S109000, C710S240000, C710S309000, C710S316000, C710S317000

Reexamination Certificate

active

06854036

ABSTRACT:
A method of transferring data in a processing system comprising a shared memory for storing data blocks, a plurality of processors, at least one of the processors having a cache memory for the data blocks, a plurality of data buses to each one at least one processor is connected, cross-bar for selectively connecting the data buses and the shared memory therebetween; the method comprises the steps of requesting the reading of a data block from the shared memory by a requesting processor, if the requested data block is present in modified form in the cache memory of an intervening processor, requesting an access to the corresponding data bus by the intervening processor, granting the access to the intervening processor, and to any other data bus available to the cross-bar, and sending the modified data block onto the data bus corresponding to the intervening processor and then onto the other data buses available.

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