Apparatus and method for enhancing the performance of personal c

Details Apparatus and method for enhancing the performance of personal c Apparatus and method for enhancing the performance of personal c

1993-10-01

1996-04-09

Heckler, Thomas M.

Boots, shoes, and leggings

364DIG2, G06F 104

Patent

active

055069819

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.

REFERENCES:
patent: 4659999 (1987-04-01), Motoyama et al.

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