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:
Apr. 09, 1996
Filed:
Oct. 01, 1993
Richard C Madter, Pusslinch, CA;
All Computers Inc., Toronto, US;
Abstract
An accelerator board for use in replacing the microprocessor of a slow speed system board with a microprocessor operating at a higher clock speed. The clock signal of the accelerator board is derived from the clock signal of the system board by first deriving a sub-harmonic frequency which is a common denominator of both the system board and the accelerator board clock signal, and using the sub-harmonic signal to control a phase locked loop oscillator to provide the desired clock speed for the accelerator board. The arrangement provides a known phase relationship between the system clock signal and the accelerator board clock signal ( which facilitates data transfer between the system board and the accelerator board. The arrangement also provides a stable clock signal for the accelerator board in those instances where the clock speed of the system board may change for certain I/O operations of the system board.