Method and apparatus for transferring data between buses having

Details Method and apparatus for transferring data between buses having Method and apparatus for transferring data between buses having

1997-09-19

1999-05-04

Ray, Gopal C.

395566, G06F 930, G06F 900

Patent

active

059012994

ABSTRACT:
A method and apparatus for ordering operations and data received by a first bus having a first ordering policy according to a second ordering policy which is different from the first ordering policy, and for transferring the order data on a second bus having the second ordering policy. The system includes a plurality of execution units for storing operations and executing the transfer of data between the first and second buses, each one of the execution units being assigned to a group which represents a class of operations. The system also includes intra prioritizer for each group, prioritizing the word operations according to the second ordering policy exclusive of the operation stored in the other groups. The apparatus also includes inter prioritizer for determining which one of the prioritized operations can proceed to execute according to the second ordering policy. The inter prioritizer includes combiner for initially allowing both an assigned read and write operation to proceed to attempt to take control over the second bus, but upon detecting via attempt, allowing the assigned read operation to execute prior to the assigned write operation.

REFERENCES:
patent: 4594660 (1986-06-01), Guenthner et al.
patent: 4967339 (1990-10-01), Fukumaru et al.
patent: 5481683 (1996-01-01), Karim
patent: 5790813 (1998-08-01), Whittaker

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