Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Reexamination Certificate
2005-03-22
2009-12-08
Lee, Thomas (Department: 2116)
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
C710S113000, C710S116000, C710S241000, C710S244000
Reexamination Certificate
active
07631130
ABSTRACT:
A circuit for selecting one of N requestors in a round-robin fashion is disclosed. The circuit 1-bit left rotatively increments a first addend by a second addend to generate a sum that is ANDed with the inverse of the first addend to generate a 1-hot vector indicating which of the requestors is selected next. The first addend is an N-bit vector where each bit is false if the corresponding requester is requesting access to a shared resource. The second addend is a 1-hot vector indicating the last selected requester. A multithreading microprocessor dispatch scheduler employs the circuit for N concurrent threads each thread having one of P priorities. The dispatch scheduler generates P N-bit 1-hot round-robin bit vectors, and each thread's priority is used to select the appropriate round-robin bit from P vectors for combination with the thread's priority and an issuable bit to create a dispatch level used to select a thread for instruction dispatching.
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Lee Thomas
MIPS Technologies, Inc
Rehman Mohammed
Sterne Kessler Goldstein & Fox PLLC
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