Timed multi-function digital interface
AssigneeInternational Business Machines Corporation
InventorBryn R. Owen
Life of this patent
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Abstract
In a data processing system a method and apparatus is provided for discriminating between digital signals of a plurality of different rates by monitoring the pulse width and repetition rate of such signals. The digital signals are continuously monitored to determine whether a single pulse or multiple pulses have been detected within a preselected time period. If only a single pulse or a portion thereof has been detected within the preselected time period a first type of control signal is generated. If multiple pulses or portions of multiple pulses have been detected within the preselected time period a second type of control signal is generated.
Claims4
In a data processing system a method of discriminating between digital signals of a plurality of different rates by monitoring the pulse width and repetition rate of such signals comprising:
- monitoring said digital signals for a preselected period of time;
- determining whether only a single pulse or multiple pulses have been detected within said preselected time period;
- if only a single pulse or a portion thereof has been detected within said preselected time period generating a first type of control signal;
- if multiple pulses or portions of multiple pulses have been detected within said preselected time period generating a second type of control signal,
- wherein if only a single pulse has been detected within said preselected time period determining the width of said pulse.
Apparatus for controlling a data processing system adapted to operate in a plurality of modes of operation for processing digital signals of a plurality of rates by selecting modes of operation of said system comprising:
- means for monitoring said digital signals for a preselected period of time;
- discrimination means for determining whether only a single pulse or multiple pulses have been detected within said preselected time period;
- control signal generating means for generating a first type of control signal if only a single pulse or a portion thereof has been detected within said preselected time period;
- control signal generating means for generating a second type of control signal if multiple pulses or portions of multiple pulses have been detected within said preselected time period;
- and
- timing means which if only a single pulse has been detected within said preselected time period determines the width of said pulse.
Dependencies are inferred from the claim text.