Dual ROM microprogrammable microprocessor and universal serial bus microcontroller development system
Patent 5859993 Issued on January 12, 1999. Estimated Expiration Date: 
August 30, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 30, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3833888 Industrial control processor system Microprogram data processing technique and apparatus Information processing system including a one-chip arithmetic control unit Communication channel interface unit System and method for power control in a universal serial bus Patent #: 5675813 InventorApplicationNo. 705807 filed on 08/30/1996US Classes:712/208INSTRUCTION DECODING (E.G., BY MICROINSTRUCTION, START ADDRESS GENERATOR, HARDWIRED)ExaminersPrimary: Eng, David Y.Attorney, Agent or FirmForeign Patent References
International ClassG06F 009/48AbstractA microprogrammable microprocessor that stores microprogramming instruction sets in a dual ROM configuration enhancing reusability of subroutine operations common between two or more instructions. A first ROM contains a look up table identifying the subroutine(s) utilized by each instruction. The second ROM contains the subroutines needed to implement the required operations for each instruction. The dual ROM microprogrammable microprocessor is used in a Universal Serial Bus microcontroller development system having a microprocessor, control circuit, and an interface to USB bus. The microprocessor system state and I/O registers are mapped to a system bus sharing the same lines with a control circuit. The control circuit provides an RS-232 interface to an attached computing device able to write and read data words to the system bus, thereby to control the microprocessor and associated hardware by setting the system state and writing/reading data from RAM. The control circuit is also attached to a Universal Serial Bus, hence allowing 100% testing of USB compliant devices and firmware. The circuit specs can be programmed in a Hardware Description Language which is then mapped onto a family of programmable circuit devices such as ASICs or FPGAs.Other References
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