Abstract:
Various bus trace topologies are provided which allow for shorter stub lengths, reduced motherboard costs, more efficient routing between multiple agents, and bus traces with better matched characteristic impedances.
Abstract:
Various bus trace topologies are provided which allow for shorter stub lengths, reduced motherboard costs, more efficient routing between multiple agents, and bus traces with better matched characteristic impedances.
Abstract:
A circuit board configured to provide multiple interfaces is disclosed. The circuit board comprises a termination slot inserted with a termination module configured to modulate circuits by applying a termination resistance and a termination voltage. If the termination module is inserted into the termination slot, the circuit board operates as a series stub terminated transceiver logic (SSTL) interface. Otherwise, the board operates as a low voltage transistor logic (LVTTL) interface. Additionally, the board comprises a switch configured to selectively connect a termination resistance to a bus. If the switch connects the termination resistance to the bus, the board operates as an SSTL interface. Otherwise, the board operates as an LVTTL interface.
Abstract:
A novel backplane interconnection system that is useful in the telecommunication and data process industries for ultra high speed backplane systems. It is capable of transmitting digital signals with bandwidths of 10 GHz and beyond. The invention provides high performance at a low cost of manufacture. It is suitable for use in a wide variety of system applications. One embodiment of the invention comprises an air dielectric and copper conductor matched impedance transmission line system that interconnects daughter cards in a conventional backplane configuration. The high speed transmission-line structure is continuous through the backplane-daughter card and return path. Such embodiment are also integrated with conventional printed circuit backplanes or be a stand-alone device.
Abstract:
A testing apparatus, system and method for testing computer memory modules. The apparatus includes a motherboard having a processor and at least one resident memory socket fixed to the motherboard. A remote-memory socket is provided and located a distance from the resident memory socket, such as on a periphery of the motherboard. The remote memory socket is coupled to the resident memory socket by a conductor assembly such as a ribbon cable and an adapter. A memory module is placed in the remote memory socket and tested using a signal or combination of signals from the processor. A plurality of motherboards, each being configured with remote memory sockets, may be combined to form a testing system suitable for use with an automated handler.
Abstract:
A memory address driver circuit with memory module slots on a computer main board that can be divided into two groups. One group of memory module slots includes the slots whose trace line to a control chipset is smaller than 2500 mils or closest to the control chipset. The other group of memory module slots includes all the remaining slots. The control chipset includes two memory control circuits. The memory control circuit for supporting DDR DRAM is connected to the address leads of the memory module slot closest to the control chipset. However, no terminal resistors are connected to any address leads of the memory module slot. Hence, engineers may have to design one set of terminal resistors only. In addition, the memory control circuit uses one-cycle access command timing to boost system performance.
Abstract:
The motherboard MB1 of the present invention is a motherboard comprising a plurality of plug connectors 12 installed on the front face of the board 11 and a bus line for inter-connecting these plug connectors so as to allow inter-communication of daughter boards DB1-DB7 connected to the plug connectors 12. The motherboard is configured such that a termination board TB1 having a terminating resistance to decrease reflection noise of the bus line is connected to the plug connector at the last slot S8 of the bus line among the plug connectors 12, 12, . . . installed on the front face of the motherboard. Alternatively, the motherboard is configured such that the termination board is connected to the rear face of the last slot S8.
Abstract:
A high frequency bus system which insures uniform arrival times of high-fidelity signals to the devices on the high frequency bus, despite the use of the bus on modules and connectors. A high frequency bus system includes a first bus segment having one or more devices connected between a first and a second end. The first bus segment has at least a pair of transmission lines for propagating high frequency signals and the devices are coupled to the pair of transmission lines. The high frequency bus system also includes a second bus segment which has no devices connected to it. The second bus segment also has at least a pair of transmission lines for propagating high frequency signals. The first end of the first segment and second end of the second segment are coupled in series to form a chain of segments and when two signals are introduced to the first end of the second bus segment at the substantially the same time, they arrive at each device connected to the first bus segment at substantially the same time. Also, when two signals originate at a device connected to the first bus segment at substantially the same time, they arrive at the first end of the second bus segment at substantially the same time. Uniform arrival times hold despite the use of connectors to couple the segments together, despite the segments being located on modules, without the need for stubs, despite the presence of routing turns in the segments and despite the type of information, such as address, data or control, carried by the signals.
Abstract:
A circuit board such as a memory module board mounts a plurality of memory modules that are electrically connected to a module bus on a first surface of the board. The module bus is coupled to a connector at a first end thereof that permits an electrical coupling of a plurality of electrical conductors of the module bus to an external large integrated circuit board, and a terminating resistor device at a second end thereof for properly terminating predetermined ones of the plurality of electrical conductors of the module bus. The module bus is extended beyond the last memory module along the bus by a length which is sufficient to substantially limit reflections and/or crosstalk between the conductors and thereby improve signaling along the module bus. In a first embodiment, the module bus is extended around an edge of the board and for a predetermined distance over any unused portions of the backside of the board. In a second embodiment, the module bus is extended for a maximum predetermined distance along any unused portions of the front side of the board when the backside of the board is unavailable for extending the module bus.
Abstract:
A backplane consisting of segmented bus lines on a mother board with loop-through connections to active transceivers mounted on connectors to daughter boards. The transceivers isolate the interconnect to the daughter boards from the bus lines. The loop-through transmission line on the connectors preserves the impedance of the bus lines and allows the interconnect stub to the transceivers to be short, minimizing reflections and enabling high-speed backplane operation. The connectors are removable from the motherboard for repair.