Apple Inc.

Integrated Device Technology, Inc.

Pmc-sierra Us, Inc.

Inna Levit

Peter Onufryk

Timothy R Paaske

David S Warren

Mitrajit Chatterjee

Embodiments of an apparatus and method are disclosed that may allow for managing power of a computing system. The apparatus may include a clock generation circuit, a bus interface unit, and a control circuit. The clock generation circuit may be configured to generate multiple clock signals. Each clock signal may provide a timing reference to different functional blocks within a device coupled to the communication bus. The bus interface unit may be configured to receive messages from the device via the communication bus. The messages may include a latency value and a request to activate a low power mode. The control circuit may be configured to deactivate one or more of the multiple clock signals dependent upon the latency value and multiple threshold values.

System power management using communication bus protocols

A nonvolatile memory controller performs a data stripe operation on data blocks by processing a collection of commands. The nonvolatile memory controller includes command processing units, each of which processes a command of the data stripe operation to store a data block into a nonvolatile memory device. A parity calculator in the nonvolatile memory controller receives the data blocks of the data stripe operation by receiving a sequence of data blocks. The parity calculator generates a parity block in a page frame as the parity calculator receives the sequence of the data blocks. A command processing unit in the nonvolatile memory controller determines when the parity calculator has completed generating the parity block and writes the parity block to a nonvolatile memory device.

System and method for generating parity data in a nonvolatile memory controller by using a distributed processing technique

A system and method for scheduling a thread identifies runnable threads based on precycle signals determined before the scheduling cycle. The thread indexes of the runnable threads are grouped according to the thread priorities of the runnable threads, and the thread indexes are ranked within each group. The runnable threads that will be runnable in the next scheduling cycle are identified based on same cycle signals determined during the scheduling cycle. The highest ranked thread index of the runnable threads that will also be runnable in the next scheduling cycle is selected as the scheduled thread. In another configuration, a round robin ranking and a priority ranking are determined for the thread indexes. The thread indexes are then ranked according to the round robin ranking and the priority ranking and the highest ranked thread index of a runnable thread is selected as the scheduled thread.

Scheduler for a multiprocessing computing system

A system and method for scheduling a thread identifies runnable threads based on precycle signals determined before the scheduling cycle. The thread indexes of the runnable threads are grouped according to the thread priorities of the runnable threads, and the thread indexes are ranked within each group. The runnable threads that will be runnable in the next scheduling cycle are identified based on same cycle signals determined during the scheduling cycle. The highest ranked thread index of the runnable threads that will also be runnable in the next scheduling cycle is selected as the scheduled thread.

System and method of scheduling computing threads

A rate limiting circuit for data stream transmissions provides a generated clock signal to a buffer interposed between source and destination components so as to programmably adjust the maximum rate that data can be passed through the buffer. A counter is incremented by one each (1+RL) cycles of a clock signal, where RLis the larger of a user programmable value (RL) and a manufacturer one-time programmed value (SERL). A controller receiving a request to access the buffer for a read or write operation, checks the count of the counter before activating the access enable line. If the count is greater than zero, then the controller activates the access enable line while decrementing the counter by one. If the count is zero, however, then the controller waits until the count is greater than zero before activating the access enable line to grant the request.

Growing community of inventors

Sunnyvale, CA, United States of America

Inna Levit