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. 28, 1996
Filed:
Apr. 14, 1994
David A Burgoon, Ft. Collins, CO (US);
Lawrence G Mahoney, Ft. Collins, CO (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A controller that achieves data transfer concurrency when transferring data between a CPU and a device controller by modifying the way a CPU interface within the controller transmits read access commands to a frame buffer (memory) controller connected to the interface. The interface supplies a continuous stream of read commands to the frame buffer controller after receiving the first read command from the CPU. The additional commands sent to the frame buffer controller cause it to continuously read data and send it to the interface, which stores the data in preparation for the next read command from the CPU. When the second and subsequent read requests are received by the CPU interface from the CPU, the current byte or word at the output of the FIFO within the CPU interface is returned immediately to the CPU, without having to explicitly transmit a read access command to the memory controller and wait for the resulting data.