초록 ▼

A synchronous bus system includes a clock line having a forward direction clock segment and a reverse direction clock segment connected to each of a plurality of devices. The forward direction clock segment carries a forward direction clock signal, and the reverse direction clock segment carries a r

A synchronous bus system includes a clock line having a forward direction clock segment and a reverse direction clock segment connected to each of a plurality of devices. The forward direction clock segment carries a forward direction clock signal, and the reverse direction clock segment carries a reverse direction clock signal. Synchronization clock circuitry, provided in each device, receives the forward direction clock signal and the reverse direction clock signal. Using the received clock signals, the synchronization clock circuitry derives a universal synchronization clock signal which is synchronous throughout all devices. Skew correction circuitry, provided in at least a portion of the devices, corrects for skew between the universal synchronization clock signal and one or more data signals for transferring data between devices.

대표청구항 ▼

A synchronous bus system includes a clock line having a forward direction clock segment and a reverse direction clock segment connected to each of a plurality of devices. The forward direction clock segment carries a forward direction clock signal, and the reverse direction clock segment carries a r

A synchronous bus system includes a clock line having a forward direction clock segment and a reverse direction clock segment connected to each of a plurality of devices. The forward direction clock segment carries a forward direction clock signal, and the reverse direction clock segment carries a reverse direction clock signal. Synchronization clock circuitry, provided in each device, receives the forward direction clock signal and the reverse direction clock signal. Using the received clock signals, the synchronization clock circuitry derives a universal synchronization clock signal which is synchronous throughout all devices. Skew correction circuitry, provided in at least a portion of the devices, corrects for skew between the universal synchronization clock signal and one or more data signals for transferring data between devices. vals that vary in accordance with the amount of activity demonstrated by active descriptors and the assigned priority level of said individual descriptors by executing a driver loop which queries a plurality of descriptors of said predetermined sized group of descriptors and processes the descriptors that have activity, said plurality of descriptors including those descriptors which are in the highest priority level; changing the priority level of individual descriptors when the amount of activity of said individual descriptors changes from that which is expected in a particular level, wherein said priority levels vary from higher priority levels to lower priority levels, said higher priority levels having a higher amount of activity, the frequency of querying being higher for higher priority levels. 2. A method as defined in claim 1 wherein said step of changing the priority level comprises changing the level of an individual descriptor to a higher level when said descriptor activity exceeds that which is expected for its assigned priority level and changing to a lower priority level when the activity is lower than that which is expected for its assigned priority level. 3. A method as defined in claim 2, wherein each priority level has a range of values of activity, the lowest priority level insuring a query within a predetermined time period. 4. A method as defined in claim 1 wherein said large area network comprises a network that includes the Internet. 5. A method of efficiently querying and processing individual descriptors of a group of descriptors by a processing means operating with a large set of devices or processes, said method comprising the steps of: querying said plurality of descriptors and processing said descriptors that have activity; assigning individual descriptors to a predetermined priority level of a hierarchical set of priority levels that are proportional to the amount of activity that individual descriptors are demonstrating; successively querying said individual descriptors at various intervals that vary in accordance with the amount of activity demonstrated by active descriptors and the assigned priority level of said individual descriptors; changing the priority level of individual descriptors when the amount of activity of said individual descriptors changes from that which is expected in a particular level, wherein said priority levels vary from higher priority levels to lower priority levels, said higher priority levels having a higher amount of activity, the frequency of querying being higher for higher priority levels wherein each descriptor of said predetermined sized group of descriptors is queried during multiple successive executions of a driver loop which queries a plurality of descriptors of said predetermined sized group of descriptors and processes the descriptors that have activity, each descriptor being queried at an interval n that varies between 1 and N, where n represents the number of executions of said driver loop that are required to query an individual descriptor and N represents a large number of iterations of executions of said driver loop and 1 represents every execution of said driver loop. 6. A method as defined in claim 1 further including the step of reinitiating said querying step after a time out value in the event no descriptors have activity. 7. A method as defined in claim 6 wherein said time out value represents a variable duration that is inversely proportional to said priority level. 8. A method of querying and processing individual descriptors of a group of descriptors by a processing means operating with a large set of devices or processes, said method comprising the steps of: iteratively querying said plurality of descriptors by executing a driver loop which queries a plurality of descriptors of said predetermined sized group of descriptors and processing said descriptors, including those descriptors which are in the highest priority level, tha t have activity a sufficient number of times to determine the level of activity of individual descriptors; grouping individual descriptors in predetermined priority levels in a hierarchical set of priority levels based upon the amount of activity that is occurring for each individual descriptor, wherein said priority levels vary from higher priority levels to lower priority levels, said higher priority levels having a higher amount of activity, the time duration between successive queries being shorter for higher priority levels; changing the priority level of individual descriptors during successive querys when the amount of activity of said individual descriptors changes from that which is expected at a particular level. 9. A method as defined in claim 8 wherein said step of changing the priority level comprises changing the level of an individual descriptor to a higher level when said descriptor activity exceeds that which is expected for its assigned priority level and changing to a lower priority level when the activity is lower than that which is expected for its assigned priority level. 10. A method as defined in claim 9 wherein each priority level has a range of values of activity, the lowest priority level insuring a query within a predetermined time period. 11. A method as defined in claim 8 wherein each descriptor of said group of descriptors is queried during multiple successive executions of a driver loop which querys a plurality of descriptors of said group of descriptors and processes the descriptors that have activity, each descriptor being queried at an interval n that varies between 1 and N, where n represents the number of executions of said driver loop that are required to query an individual descriptor and N represents a large number of iterations of executions of said driver loop and 1 represents a query every execution of said driver loop. 12. A method as defined in claim 8 further including the step of reinitiating said querying step after a time out value in the event no queried descriptors have activity. 13. A method as defined in claim 12 wherein said time out value represents a variable duration that is inversely proportional to said priority level.