A system and method are provided for translating local IP addresses to globally unique IP addresses. This allows local hosts in an enterprise network to share global IP addresses from a limited pool of such addresses available to the enterprise. The translation is accomplished by replacing the source address in headers on packets destined for the Internet and by replacing destination address in headers on packets entering the local enterprise network from the Internet. Packets arriving from the Internet are screened by an adaptive security algorithm. According to this algorithm, packets are dropped and logged unless they are deemed nonthreatening. DNS packets and certain types of ICMP packets are allowed to enter local network. In addition, FTP data packets are allowed to enter the local network, but only after it has been established that their destination on the local network initiated an FTP session.

Security system for network address translation systems

An improved structure and method are provided for increasing the operational bandwidth between different circuit devices, e.g. logic and memory chips, without requiring changes in current CMOS processing techniques. The structure includes the use of a silicon interposer. The silicon interposer can consist of recycled rejected wafers from the front-end semiconductor processing. Micro-machined vias are formed through the silicon interposer. The micro-machined vias include electrical contacts which couple various integrated circuit devices located on the opposing surfaces of the silicon interposer.

Structure and method for a high performance electronic packaging assembly

A multiprocessor computer system has a multiplicity of sub-systems and a main memory coupled to a system controller. Some of the sub-systems are data processors, each having a respective cache memory that stores multiple blocks of data and a respective set of master cache tags (Etags), including one Etag for each data block stored by the cache memory. Each data processor includes an interface for sending memory transaction requests to the system controller and for receiving cache transaction requests from the system controller corresponding to memory transaction requests by other ones of the data processors. The system controller includes transaction activation logic for activating each said memory transaction request when it meets predefined activation criteria, and for blocking each said memory transaction request until the predefined activation criteria are met. An active transaction status table stores status data representing memory transaction requests that have been activated, including an address value for each activated transaction. The transaction activation logic includes comparator logic for comparing each memory transaction request with the active transaction status data for all activated memory transaction requests so as to detect whether activation of a particular memory transaction request would violate the predefined activation criteria. With certain exceptions concerning writeback transactions, an incoming transaction for accessing a data block that maps to the same cache line a pending, previously activated transaction, will be blocked until the pending transaction that maps to the same cache line is completed.

Transaction activation processor for controlling memory transaction processing in a packet switched cache coherent multiprocessor system

Systems and methods of managing processors provide for detecting a command at a core of a processor having a plurality of cores, where the command requests a transition of the core to an idle state. Power consumption of the core is managed based on the command and an idle state status of each of the plurality of cores.

Coordinating idle state transitions in multi-core processors

A system for an integrated circuit comprising a plurality of power islands includes a first power manager and a second power manager. The first power manager manages a first power consumption for the integrated circuit based on needs and operation of the integrated circuit. The second power manager communicates with the first power manager and manages a second power consumption for one of the power islands.

Power managers for an integrated circuit

Briefly, in accordance with one embodiment of the invention, a system includes: a processor, a voltage regulator, and a memory. The voltage regulator is coupled to the processor to adjust the operating voltage of the processor. The memory is coupled to the processor by a memory bus. The memory has stored on it processor instructions that, when executed by the processor, result in modification of the operating frequency of the processor and result in adjustment of the operating voltage of the processor, based, at least in part, on dynamic changes in the processing load of the processor.

Method and apparatus for dynamic power control of a low power processor

The system and method described provide for the detection and protection of memory accesses without the overhead typically incurred by memory management units. The processor includes a guarded memory unit, which monitors memory accesses to be performed by monitoring transmissions across the memory bus. The guarded memory unit includes a plurality of registers which identify memory addresses and modes which can cause a memory protection or detection violation to occur. If a memory protection violation occurs, a cancel signal is issued to cancel the memory operation prior to completion in order to protect the memory from unauthorized accesses. If a memory violation is detected, the memory operation is permitted to complete and a fault signal is issued to the processor to identify that a memory violation has been detected. As the structure of the protection mechanism does not require separate cycles in the processor, and simply monitors the memory bus for memory accesses, memory protection and detection can be performed with no additional overhead at the processor.

System for protecting unauthorized memory accesses by comparing base memory address with mask bits and having attribute bits for identifying access operational mode and type

Briefly, in accordance with one embodiment of the invention, an integrated circuit has a voltage regulator and a clock divider that may be used to adjust the operational frequency and/or voltage potential of the integrated circuit to reduce the power consumption of the integrated circuit while in operation.

Apparatus having adjustable operational modes and method therefore

A processor for executing a set of instructions, where each instruction in said set of instructions includes a set of operand references. The processor includes an instruction decoder for extracting the set of operand references from each instruction in the set of instructions; a register file decoder connected to the instruction decoder for receiving the set of operand references and generating a set of register data select signals; and, a register file connected to the register file decoder for receiving the set of register data select signals. Further, the register file includes: a set of registers; a first set of scoreboard bits; and, a second set of scoreboard bits; wherein for each signal in the set of register data select signals, the register file outputs: (1) a corresponding register from the set of registers; (2) a first corresponding scoreboard bit from the first set of scoreboard bits; and, (3) a second corresponding scoreboard bit from the second set of scoreboard bits.

Method and apparatus for dynamic location and control of processor resources to increase resolution of data dependency stalls

A pre-arbitrated bypassing system in a speculative execution microprocessor is provided. The bypassing system provides execution units enhanced to include a comparator and an enabled driver. The comparator compares a bypass address that is broadcast upon instruction decode with the destination address within each execution unit. If there is a match, then the result data is driven onto the bypass bus. Additionally, a suppress signal and validation scheme/apparatus are included to ensure that valid data is being driven onto the bypass bus. A bypass bus and associated apparatus may be included for every potential source operand.

Pre-arbitrated bypasssing in a speculative execution microprocessor

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