摘要:
A bus ring-back and voltage over-shoot reduction apparatus with capability for rendering an expansion slot of a computer system hot-pluggable, wherein a logic gate controls a switching element so that when the element is turned on, the input and output (I/O) nodes of the element are in a low ohmic conductive relationship. One of the I/O nodes is coupled to an expansion card whereas the other node is coupled to a bus to which the expansion slot is connected. The apparatus operates as a level shifter wherein the output node voltage follows the input node voltage until pinch-off such that the output voltage remains substantially stable thereafter. The apparatus also isolates the expansion card from the bus when the system is running or during the powering up of the card.
摘要翻译:一种具有能够呈现计算机系统的可插拔的计算机系统的扩展槽的总线环回和电压过拍还原装置,其中逻辑门控制开关元件,使得当元件被接通时,输入和输出(I / O)节点处于低欧姆导电关系。 I / O节点中的一个耦合到扩展卡,而另一个节点耦合到扩展槽连接到的总线。 该装置作为电平转换器工作,其中输出节点电压跟随输入节点电压直到夹断,使得输出电压在此之后保持基本稳定。 当系统运行或卡上电时,该设备还将扩展卡与总线隔离开来。
摘要:
A device causing a faulty condition in a computer system having devices is isolated by detecting for a faulty condition associated with the devices and identifying the device causing the faulty condition. The devices are coupled to a bus. The faulty condition includes a bus hang condition. The devices are turned off when a bus hang condition is detected. The devices are then turned back on to test the devices. Each device is tested by writing and reading its configuration space. Information on the bus associated with the faulty condition is stored. The stored information is retrieved after the faulty condition has occurred, with the stored information including address, data, and bus control information.
摘要:
Faults in a computer system having circuits are managed by fault detectors connected to detect fault states of respective circuits. A fault manager associates the fault states with the respective circuits. The fault manager includes a system manager connected to identify which of the circuits is causing faulty operation in the computer system. The fault detectors associated with the respective circuits are configured to detect faulty operation of and to generate fault state information for the respective circuits. A central manager is connected to accumulate fault state information from the fault detectors. One of the circuits includes a bus, and the fault state includes a bus error condition. The bus is connected to multiple devices, and the fault manager identifies which of the multiple devices causes the bus error condition. One of the circuits includes multiple modules, and the fault manager identifies fault states of the multiple modules. The modules include state machines. One of the circuits includes an internal clock, and the fault state of the circuit includes the internal clock not functioning properly. One of the circuits includes a temperature sensor, and the fault state of the circuit includes a high temperature condition detected by the temperature sensor.
摘要:
Circuitry for tristating the address and data outputs of a processor to prevent a deadlock condition when the processor and another bus master is accessing a shared resource. The processor is located on a local bus and the other bus master is located on a PCI bus. Bi-directional tristate buffers are placed between the address and data output pins of the processor and the address and data portions of the first bus. If the processor is requesting a local-bus-to-PCI-bus cycle, and the PCI bus master is asserting a request for a local bus shared resource, the processor address and data output pins are tristated by the tristate buffers to allow the PCI bus master cycle to proceed. After the PCI bus master cycle completes, the tristate buffers are reenabled to allow the processor cycle to complete.
摘要:
A multi-pin edge connector assembly for connecting a daughter board to a mother board, for example, comprises a plurality of vias with conductive surfaces that are formed in the daughter board adjacent a connection edge. A plurality of openings are also formed in the daughter board, with each opening extending from the connection edge to one of the vias. Electrically conductive pins are positioned in the openings, with each pin having a first end in electrical contact with one of the conductive surfaces and a second end that projects beyond the connection edge for electrically contacting conductive pads or surfaces on the mother board. A retainer is mounted to the daughter board for holding the pins in their respective openings.
摘要:
Electrical signals are received corresponding to sets of digital data, and output optical signals are delivered, corresponding to the digital data, on at least two optical channels corresponding to different sets of the digital data, using light from a single light source. In another scheme, the optical switch may be integrated with an optical transmission medium (e.g., an optical cable).
摘要:
Electrical signals are received corresponding to sets of digital data, and output optical signals are delivered, corresponding to the digital data, on at least two optical channels corresponding to different sets of the digital data, using light from a single light source. In another scheme, the optical switch may be integrated with an optical transmission medium (e.g., an optical cable).
摘要:
Data is transmitted between a first device and a second device connected by the communications channel in a computer system. The first device generates a first clock and the second device generates a second clock. The first clock is provided to the second device and the second clock is provided to the first device. Data received by the first device over the communications channel from the second device is synchronized to the first clock. The receiving logic in the first device includes a first-in-first-out buffer The received data is stored in a first-in-first-out buffer until the data is synchronized to the first clock. The first and second clocks have the same frequency.
摘要:
A latch circuit receiving the system reset signal and the error signal from a coprocessor provides an output indicating the presence of the coprocessor. The latch circuit provides the output for computer systems which cannot connect the coprocessor error signal to a coprocessor error input on the processor.
摘要:
A back drill verification feature is provided on a layer of a circuit board. Before a back drill operation is performed, an electrical connection exists between conductive material in a via hole and the back drill verification feature. After the back drill operation, the electrical connection is severed.