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A highly intelligent programmable multi-tasking memory management system manages memory requests associated with a system on chip (SOC) device. The memory management system includes a routing controller or central processing unit (RCPU) that is used for routing/switching stream data between communic

A highly intelligent programmable multi-tasking memory management system manages memory requests associated with a system on chip (SOC) device. The memory management system includes a routing controller or central processing unit (RCPU) that is used for routing/switching stream data between communication cores and digital signal processors with minimum reliance and demand on a main or virtual central processing unit (VCPU) residing on a system bus. Tasks are partitioned between the VCPU and the RCPU within the SOC architecture for communication applications. The VCPU performs system/application tasks while the RCPU simultaneously performs multiple memory routing/switching tasks and multiple concurrent memory access connections. The memory management system also enables other processors and communication cores to update their internal data once new data is written in the memory system. In addition, a method and system are provided for performing predictive protocol fetch for multiple DSPs on the SOC to increase data processing throughput.

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A highly intelligent programmable multi-tasking memory management system manages memory requests associated with a system on chip (SOC) device. The memory management system includes a routing controller or central processing unit (RCPU) that is used for routing/switching stream data between communic

A highly intelligent programmable multi-tasking memory management system manages memory requests associated with a system on chip (SOC) device. The memory management system includes a routing controller or central processing unit (RCPU) that is used for routing/switching stream data between communication cores and digital signal processors with minimum reliance and demand on a main or virtual central processing unit (VCPU) residing on a system bus. Tasks are partitioned between the VCPU and the RCPU within the SOC architecture for communication applications. The VCPU performs system/application tasks while the RCPU simultaneously performs multiple memory routing/switching tasks and multiple concurrent memory access connections. The memory management system also enables other processors and communication cores to update their internal data once new data is written in the memory system. In addition, a method and system are provided for performing predictive protocol fetch for multiple DSPs on the SOC to increase data processing throughput. ubroutine reference information relating to the replaced calls, and information relating to the authorizing software, for use by an authorization agent; in response to execution of the software product, and hence the authorizing software, by a subscriber to be authorized, communicating to the authorization agent local data dependent upon an environment in which the software is executed; in response to the local data being received by the authorization agent for an authorized subscriber, encoding the stored subroutine reference information relating to the replaced calls in dependence upon the local data and the information relating to the authorizing software, and supplying the encoded subroutine reference information to the authorized subscriber; and at the authorized subscriber, executing the software product with the replaced calls to the redirection software, the redirection software determining target addresses for the replaced calls during run-time execution of the software product in dependence upon the encoded subroutine reference information, the local data, and the authorizing software, whereby at the authorized subscriber the software product is executed in dependence upon the redirection software without the software product ever being restored to its original form. 6. A method as claimed in claim 5 wherein the redirection software is added to the software product with the authorizing software. 7. A method as claimed in claim 5 wherein the redirection software is supplied to the authorized subscriber in response to execution of the authorizing software. 8. A method as claimed in claim 7 wherein the step of replacing calls to relocatable subroutines in the software product by calls to the redirection software comprises the steps of overwriting the calls with arbitrary data, and replacing the overwritten calls by calls to the redirection software in response to information supplied to the authorized subscriber in response to execution of the authorizing software. 9. A method as claimed in claim 5 and including the step of incorporating arbitrary data in the authorizing software. 10. A method as claimed in claim 5 wherein the step of encoding the stored subroutine reference information relating to the replaced calls in dependence upon the local data and the authorizing software comprises the step of, for each replaced call, determining a hash number H dependent upon a calling address in the stored subroutine reference information, the local data, and a hash of the authorizing software. 11. A method as claimed in claim 10 wherein the step of encoding the stored subroutine reference information further comprises the steps of, for each replaced call, storing information for identifying a target address for the call in a table of length N at an offset into the table of H mod K, where K is equal to H div N. 12. A method as claimed in claim 11 wherein, for each replaced call, the information stored in the table is produced by an exclusive-or combination of the respective target address with the respective value K. 13. A method of modifying a software product for controlled use, comprising the steps of: producing a distributable software product by replacing in the software product calls to relocatable subroutines by calls to redirection software, and adding the redirection software and authorizing software for execution on execution of the distributable software product to communicate with an authorization agent to authorize a subscriber for controlled use of the distributable software product and to provide encoded subroutine reference information necessary for the redirection software to determine only during run-time execution of the software product, in dependence upon local data relating to the authorized subscriber, a target address for each replaced call, whereby at the authorized subscriber the software product is executed in dependence upon the redirection software without the software product ever being res