Boots – shoes – and leggings
Patent
1992-08-10
1995-10-17
Shin, Christopher B.
Boots, shoes, and leggings
364DIG1, 364270, 3642704, 364271, 3642714, 3642719, G06F 104
Patent
active
054598559
ABSTRACT:
A system and method is disclosed for determining the clock frequency ratio between a CPU clock and a "secondary clock," where the secondary clock controls one or more operations external to the CPU. The present invention is configured to function with a CPU which can operate interchangeably at one of two or more possible clock frequency ratios. In a preferred embodiment, a system clock generator outputs a signal SYNCH which has a frequency equal to the frequency of the secondary clock divided by an integer N. Signal CK2, having the same frequency as the CPU clock, and SYNCH, are input to a frequency ratio detector. The frequency ratio detector determines the clock frequency ratio between the CPU clock and the secondary clock, where this ratio can be only one of a discrete number of fixed values. The frequency ratio detector outputs one or more MODE bits which indicate the clock frequency ratio detected. The MODE bits are used by the CPU synchronization logic for generating the timing signals necessary for interfacing with hardware controlled by the secondary clock.
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Barry Lance L.
Hewlett--Packard Company
Shin Christopher B.
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