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:
May. 14, 2002
Filed:
Feb. 08, 1999
Michael Raam, Cupertino, CA (US);
Toru Utsumi, Kawasaki, JP;
Takeki Osanai, Ebina, JP;
Kamran Malik, San Jose, CA (US);
Kabushiki Kaisha Toshiba, , JP;
Abstract
The present invention comprises a LSU which executes instructions relating to load/store. The LSU includes a DCACHE which temporarily stores data read from and written to the external memory, an SPRAM used to specific purposes other than cache, and an address generator generating virtual addresses for access to the DCACHE and the SPRAM. Because the SPRAM can load and store data by a pipeline of the LSU and exchanges data with an external memory through a DMA transfer, the present invention is especially available to high-speedily process a large amount of data such as the image data. Because the LSU can access the SPRAM with the same latency as that of the DCACHE, after data being stored in the external memory is transferred to the SPRAM, the processor can access the SPRAM in order to perform data process, and it is possible to process a large amount of data with shorter time than time necessary to directly access an external memory.