摘要:
A system for the encryption and decryption of data employing dual ported RAM to accelerate data processing operations during the computation of the encryption and decryption algorithm. The system includes logic to track data changes in the dual ported memory for fast table initialization; a means to accelerate operations by performing read/write operations in different iterations of the algorithm to separate ports on the dual ported RAM in the same clock cycle; and a means to resolve data manipulation conflicts between out of order read/write operations so that the system correctly computes the desired algorithm.
摘要:
A system of data transfer between a first processing device and a second processing device which speeds data transfer by eliminating intermediate storage steps. A plurality of memory storage devices are provided between the first and second processing devices for the purpose of synchronization and alignment. One of the memory storage devices is associated with the second processing device. In accordance with a first embodiment of the present invention, a new instruction is provided to implement a data transfer function for transferring data directly between a first memory storage device and a second memory storage device, without intermediate storage in a processor register. Thereafter, the data is transferred from the second memory storage device to the memory storage device associated with the second processing device. In accordance with a second embodiment of the present invention, data is efficiently transferred directly between a first memory storage device and the memory storage device associated with the second processing device, without intermediate storage in either a processor register or a second memory storage device.
摘要:
A power conservation system which provides for fast and efficient transitions between fast and slow processor clocking speeds. The slow processor clocking speed minimizes power consumption during periods of processor inactivity (idle states) or low priority execution. The fast processor clocking speeds are utilized during periods of processor activity (active states) or high priority execution. Used in conjunction with a context-sensitive processor, the power conservation system is able to monitor the state of the processor and modify the processor clocking speed accordingly.
摘要:
A system for the encryption and decryption of data employing dual ported RAM for key storage to accelerate data processing operations. The on-chip key storage includes a dual-ported memory device which allows keys to be loaded into memory simultaneous with keys being read out of memory. Thus, an encryption or decryption algorithm can proceed while keys are being loaded into memory.
摘要:
Techniques for implementing caches for context switching applications are provided. A context identifier is stored in the cache to indicate the context to which data in the cache is associated. Additionally, the context can have different priorities so that storage space in the cache can be more efficiently allocated to the contexts based on their priorities.
摘要:
A system for the encryption and decryption of data employing dual ported RAM for key storage to accelerate data processing operations. The on-chip key storage includes a dual-ported memory device which allows keys to be loaded into memory simultaneous with keys being read out of memory. Thus, an encryption or decryption algorithm can proceed while keys are being loaded into memory.
摘要:
An industrial control system employs a primary and secondary controller each having a processor and an I/O data table. Updating of the secondary processor's I/O data table is accomplished synchronously with execution of the program in the primary processor at a particular point in the program. A tracking of changes in the I/O data table of the primary processor is used to transmit only changes in the I/O table to the secondary processor thereby avoiding undue interruption of the executing program while preserving synchronicity.
摘要:
A method and implementation disclosed for detecting interference. A state machine controller is provided for establishing an interference detection cycle including a power sample period and a periodic sampling interval. A receiver component, responsive to the state machine controller, performs an energy measurement at a predetermined wireless band during the power sample period. A threshold comparator determines whether the energy measurement exceeds a predetermined threshold. A processing implementation processes the energy measurement to determine whether it corresponds to interference on the predetermined wireless band, if the measurement exceeds the predetermined threshold. A deactivating implementation is used to instruct the state machine controller to await the next power sample period, if the energy measurement does not exceed the predetermined threshold.
摘要:
A queuing system utilizing dual first-in, first-out (FIFO) memories is provided. The present queuing system is configured to use a first FIFO memory to receive and transfer a plurality of frames to a second FIFO memory wherein the frames include encrypted frame contents. The first FIFO memory is configured to transfer an interrupt to an associated processor in response to completion of the receipt of a valid frame. Next, the processor is configured to reinitialize the first FIFO memory for receipt of a subsequent frame.Additionally, the second FIFO memory is suitably adapted to concurrently store a plurality of frames transferred from the first FIFO memory. Finally, the present system is configured to transfer one of the stored frames out of the second FIFO memory in response to the completion of a data processing operation (e.g. initialization of a decryption algorithm).
摘要:
Techniques for implementing caches for context switching applications are provided. A context identifier is stored in the cache to indicate the context to which data in the cache is associated. Additionally, the context can have different priorities so that storage space in the cache can be more efficiently allocated to the contexts based on their priorities.