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:
Sep. 16, 1986
Filed:
May. 16, 1983
Edward Gershenson, Worcester, MA (US);
Louis A Lemone, Stow, MA (US);
Salvatore Faletra, Framingham, MA (US);
Stephen A Caldara, Wayland, MA (US);
Mark C Lippitt, Ashland, MA (US);
William A Braun, Lexington, MA (US);
Data General Corporation, Westboro, MA (US);
Abstract
A digital data bus system for connecting a controller and a disk drive. Data on the disk is stored in track sectors containing a header and data. The controller includes a high-speed processor which performs a header compare operation comparing the values received from a header with the expected contents of the header and operations which determine when all of the data in a track sector has been transferred. The digital data bus system includes a bus for transferring data between the controller and the disk drive and a header-data mode bus for providing a header mode signal and a data mode signal from the controller to the disk drive. During an operation transferring data between the controller and the disk, the disk drive responds to the header mode signal by transferring a header to the controller. If the header compare operation indicates that the header is valid, the controller provides the data mode signal and the disk drive respond by transferring data to or from the track sector as required for the operation. When the controller determines that all of the data has been transferred, it again provides the header mode signal to the disk drive and the disk drive responds as just described.