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:
Dec. 26, 2000
Filed:
Jul. 29, 1998
Hung Cao Nguyen, San Jose, CA (US);
Son Hong Ho, Los Altos, CA (US);
NeoMagic Corp., Santa Clara, CA (US);
Abstract
An embedded DRAM is incorporated inside a digital-versatile-disk (DVD) playback-controller integrated circuit. Data from the DVD optical disk is written to a data block in the embedded DRAM. Error correction is performed by reading the data block to generate syndromes and over-writing errors in the data block with corrections. Once the data block is corrected, it is copied or moved to a different area of the embedded memory, a host-buffer area. As the data block is moved, de-scrambling is performed to decrypt the data. The re-ordered data is stripped of overhead such as ECC bytes and written to the host-buffer area of the embedded DRAM. A checksum is generated as the data is moved, and the checksum is compared to a stored checksum to ensure that all errors were corrected. The data block in the host-buffer area is then transferred to a host. The embedded DRAM has a very wide data-access width of 16 bytes. The full width is used for writing data from the optical disk to the ECC data block buffer, and for reading data from the host-buffer area to the host. Narrower access widths are used by the error correction and de-scrambler blocks.