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. 10, 1998
Filed:
Nov. 16, 1994
Kevin M Christiansen, Saratoga, CA (US);
David V James, Palo Alto, CA (US);
Bruce E Eckstein, Cupertino, CA (US);
Apple Computer, Inc., Cupertino, CA (US);
Abstract
A DMA controller capable of conditional action under the control of a status register, prespecified parameters, and a condition field of the channel command, and a DMA controller which returns status information to command entry locations that are reserved for this purpose are disclosed. The prespecified parameters may be held in a register having a mask field and a value field, and a test for conditional action may be a masked comparison of the status register and the value field. The condition field determines how the test result is interpreted and allows suppressing or forcing the conditional action during a command.