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:
Aug. 08, 1995
Filed:
Aug. 03, 1989
Charles H Moore, Woodside, CA (US);
Russell H Fish, III, Mt. View, CA (US);
Nanotronics Corporation, Eagle Point, OR (US);
Abstract
A microprocessor (50) includes a main central processing unit (CPU) (70) and a separate direct memory access (DMA) CPU (72) in a single integrated circuit making up the microprocessor (50). The main CPU (70) has a first 16 deep push down tack (74), which has a to item register (76) and a next item register (78), respectively connected to provide inputs to an arithmetic logic unit (ALU) (80) by lines (82) and (84). An output of the ALU (80) is connected to the top item register at (82) is also connected by line (88) to an internal data bus (90). CPU (70) is pipeline free. The simplified CPU (70) requires fewer transistors to implement than pipelined architectures, yet produces performance which matches or exceeds existing techniques. The DMA CPU (72) provides inputs to the memory controller (118) on line (148). The memory controller (118) is connected to a RAM by address/data bus (150) and control lines (152). The DMA CPU (72) enables the CPU (70) to execute instructions four times faster than the RAM speed by fetching four instructions in a single memory cycle.