Abstract:
A system includes multiple agents coupled to an optical bus for transmission of high speed signals and to an electrical bus for transmission of low speed signals. The agents can be memory modules, such as DIMMs. An optical connector housing for coupling the agent to the optical bus can include a reflective device such a mirror, a semi reflective mirror, a pellicle beamsplitter, or the like. The low speed signals can be, for example, power, ground, and supervisory signals. The high speed signals can be, for example, data, address, control, and clock signals.
Abstract:
A circuit arrangement and method interface multiple functional blocks within an integrated circuit device via a concurrent serial interconnect capable of routing separate serial command, data and clock signals between functional blocks in the device. The concurrent serial interconnect utilizes a plurality of serial ports that are selectively coupled to one another by an interface controller to define one or more logical communication channels between two or more of the serial ports. Each serial port is coupled via a point-to-point interconnection with a port interface in a functional block. In addition, the concurrent serial interconnect facilitates the design of an integrated circuit device by supporting the addition of a serial interconnect to an assemblage of functional blocks, with each functional block associated with one of a plurality of serial ports in the serial interconnect.
Abstract:
A distributed firewall is utilized in conjunction with a memory-mapped serial communications interface such as that defined by the IEEE 1394 specification to permit secure data transmission between selected nodes over the interface. The distributed firewall incorporates security managers in the selected nodes that are respectively configured to control access to their associated nodes, thereby restricting access to such nodes to only authorized entities. Furthermore, encrypted transmissions may be supported to restrict unauthorized viewing of data transmitted between the selected nodes over the interface. Implementation of the distributed firewall does not modify any critical specifications for the memory-mapped communications interface that would prevent the selected nodes from residing on the same interface as other nodes that adhere to such specifications but that do not support secure data transmission.
Abstract:
A circuit arrangement utilizes a common bus for functional operations of logic circuits and for scan testing the logic circuits. In one embodiment, input/output ports and scan test ports of the logic circuits are switchably coupled to a bus. For functionally testing the logic circuits, a predetermined command transmitted over the bus causes the scan test ports to be coupled to the bus and the input/output ports to be decoupled from the bus. Test data may then be transmitted to and from the logic circuits via the bus. When testing is complete, a second predetermined command transmitted over the bus causes the scan test ports to be decoupled from the bus and the input/output ports to be coupled to the bus.
Abstract:
An integrated circuit test apparatus employs a main test circuit load board which has a circular array of relay card mounts located on it. Auxiliary relays, operated in conjunction with the load board, are mounted in groups on individual relay circuit cards, each card including several relays. The relay circuit cards have connectors on first and second edges thereof; and the connectors on the first edges interconnect with the corresponding receptacles on the relay card mounts. A customized configuration board load ring for the particular integrated circuit device under test (DUT) then is placed over the second edges of the relay circuit cards to interconnect with spring-loaded connectors on these edges to effect the configuration for the operation of the particular DUT which is undergoing test at any given time.
Abstract:
The present invention relates to a system and method for securing sensitive data on mass storage devices. The system and method use an encryption device to encrypt sensitive data that is to be stored on the mass storage devices. A plurality of cryptographic keys are provided to ensure that only authorized personnel have the ability to access the encrypted data.
Abstract:
The present invention relates to a system and method for programming VROM links. The system has an address selection circuit connected to the VROM link for selecting an address in the VROM link in which to program. A polarity control circuit is also connected to the VROM link. The polarity control circuit allows one to control the directional flow of a current used in programming the VROM link.
Abstract:
A serial bit input controller uses clock and data input lines for communicating command information, as well as the clock and data information, to an integrated circuit chip. The circuit functions by employing a multi-stage shift register as a command storage register. The outputs of the shift register are connected to the inputs of coincidence logic gates, the outputs of which in turn supply signals to command state latch circuits. The selection of any one of the command state latch circuits depends upon the data stored in the multi-stage shift register. The shift register, in turn, is enabled by signals on the clock line by holding the clock line high and toggling it with data pulses. When the desired count is reached, the clock signal is allowed to resume, and is applied to the latch circuits to store the command state in the selected latch circuit. To clear the system, a two-stage binary clear latch is employed. This clear latch is enabled by signals on the clock data line when the clock signals is held low. This circuit is toggled by the next data pulse, which causes it to produce a clear output pulse to all of the command state latch circuits.