The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 2002
Filed:
Jul. 16, 1999
John Edward Derrick, Round Rock, TX (US);
Lee Evan Eisen, Austin, TX (US);
Hung Qui Le, Austin, TX (US);
Robert Greg McDonald, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A dummy instruction is issued, followed by several groups of No Operations (NOPs). The instruction sequencer unit (ISU) detects the dummy instruction and stalls the pipeline until the scoreboard indicates the XER count is valid. After a read from a scoreboarded Special Purpose Register (SPR), No Operation—Internal Operations (NOP—IOPs) are inserted between write and read SPR IOPs to allow an ISU scoreboard mechanism to be activated before being tested by a read SPR IOP. A read-write-read sequence is utilized: a dummy read of the string count field from a scoreboarded SPR, writing that value back to the same SPR and then performing a read of the SPR once again. A predetermined number of dummy IOPs follow the initial dummy read to prevent the value of the string count field from being read too soon.