Electrical computers and digital data processing systems: input/ – Access arbitrating – Access prioritizing
Reexamination Certificate
2006-02-28
2006-02-28
Perveen, Rehana (Department: 2112)
Electrical computers and digital data processing systems: input/
Access arbitrating
Access prioritizing
C710S113000
Reexamination Certificate
active
07007124
ABSTRACT:
A data processing system includes: at least one function module connected to a single system bus; a data transfer controller which outputs a first bus use permission request signal based on a data transfer request signal output from the at least one function module; a central processing unit connected to the system bus which outputs a second bus use permission request signal; an arbitration controller for determining, based on the first and second bus use permission request signals, which of the data transfer controller and the central processing unit should obtain a permission to use the system bus; a section for setting a first data amount which can be continuously transferred by the at least one function module; a section for suspending an output of the first bus use permission request signal to the arbitration controller for at least one clock cycle after a data transfer by the at least one function module is completed; and a section for giving the permission to use the system bus to one of the data transfer controller and the central processing unit in such a manner that the data transfer controller has a priority over the central processing unit during a period when the first bus use permission request signal is being issued.
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Birch & Stewart Kolasch & Birch, LLP
Cerullo Jeremy S.
Perveen Rehana
Sharp Kabushiki Kaisha
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